types.ts

import {
    CancellationToken,
    CompilerHost,
    CompilerOptions,
    CustomTransformers,
    Diagnostic,
    DiagnosticWithLocation,
    DocumentHighlights,
    DocumentPositionMapper,
    EmitOutput,
    ExportInfoMap,
    ExportMapInfoKey,
    FileReference,
    GetEffectiveTypeRootsHost,
    HasChangedAutomaticTypeDirectiveNames,
    HasInvalidatedResolutions,
    JSDocParsingMode,
    LineAndCharacter,
    MinimalResolutionCacheHost,
    ModuleResolutionCache,
    ModuleSpecifierCache,
    ParsedCommandLine,
    Path,
    Program,
    ProjectReference,
    ResolutionMode,
    ResolvedModule,
    ResolvedModuleWithFailedLookupLocations,
    ResolvedProjectReference,
    ResolvedTypeReferenceDirective,
    ResolvedTypeReferenceDirectiveWithFailedLookupLocations,
    ScriptKind,
    SourceFile,
    SourceFileLike,
    SourceMapper,
    StringLiteralLike,
    Symbol,
    SymlinkCache,
    TextChangeRange,
    textChanges,
    TextRange,
    TextSpan,
    UserPreferences,
} from "./_namespaces/ts.js";

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface Node {
        getSourceFile(): SourceFile;
        getChildCount(sourceFile?: SourceFile): number;
        getChildAt(index: number, sourceFile?: SourceFile): Node;
        getChildren(sourceFile?: SourceFile): readonly Node[];
        /** @internal */
        getChildren(sourceFile?: SourceFileLike): readonly Node[]; // eslint-disable-line @typescript-eslint/unified-signatures
        getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
        /** @internal */
        getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number; // eslint-disable-line @typescript-eslint/unified-signatures
        getFullStart(): number;
        getEnd(): number;
        getWidth(sourceFile?: SourceFileLike): number;
        getFullWidth(): number;
        getLeadingTriviaWidth(sourceFile?: SourceFile): number;
        getFullText(sourceFile?: SourceFile): string;
        getText(sourceFile?: SourceFile): string;
        getFirstToken(sourceFile?: SourceFile): Node | undefined;
        /** @internal */
        getFirstToken(sourceFile?: SourceFileLike): Node | undefined; // eslint-disable-line @typescript-eslint/unified-signatures
        getLastToken(sourceFile?: SourceFile): Node | undefined;
        /** @internal */
        getLastToken(sourceFile?: SourceFileLike): Node | undefined; // eslint-disable-line @typescript-eslint/unified-signatures
        // See ts.forEachChild for documentation.
        forEachChild<T>(cbNode: (node: Node) => T | undefined, cbNodeArray?: (nodes: NodeArray<Node>) => T | undefined): T | undefined;
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface Identifier {
        readonly text: string;
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface PrivateIdentifier {
        readonly text: string;
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface Symbol {
        readonly name: string;
        getFlags(): SymbolFlags;
        getEscapedName(): __String;
        getName(): string;
        getDeclarations(): Declaration[] | undefined;
        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
        /** @internal */
        getContextualDocumentationComment(context: Node | undefined, checker: TypeChecker | undefined): SymbolDisplayPart[];
        getJsDocTags(checker?: TypeChecker): JSDocTagInfo[];
        /** @internal */
        getContextualJsDocTags(context: Node | undefined, checker: TypeChecker | undefined): JSDocTagInfo[];
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface Type {
        getFlags(): TypeFlags;
        getSymbol(): Symbol | undefined;
        getProperties(): Symbol[];
        getProperty(propertyName: string): Symbol | undefined;
        getApparentProperties(): Symbol[];
        getCallSignatures(): readonly Signature[];
        getConstructSignatures(): readonly Signature[];
        getStringIndexType(): Type | undefined;
        getNumberIndexType(): Type | undefined;
        getBaseTypes(): BaseType[] | undefined;
        getNonNullableType(): Type;
        /** @internal */ getNonOptionalType(): Type;
        /** @internal */ isNullableType(): boolean;
        getConstraint(): Type | undefined;
        getDefault(): Type | undefined;

        isUnion(): this is UnionType;
        isIntersection(): this is IntersectionType;
        isUnionOrIntersection(): this is UnionOrIntersectionType;
        isLiteral(): this is LiteralType;
        isStringLiteral(): this is StringLiteralType;
        isNumberLiteral(): this is NumberLiteralType;
        isTypeParameter(): this is TypeParameter;
        isClassOrInterface(): this is InterfaceType;
        isClass(): this is InterfaceType;
        isIndexType(): this is IndexType;
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface TypeReference {
        typeArguments?: readonly Type[];
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface Signature {
        getDeclaration(): SignatureDeclaration;
        getTypeParameters(): TypeParameter[] | undefined;
        getParameters(): Symbol[];
        getTypeParameterAtPosition(pos: number): Type;
        getReturnType(): Type;
        getDocumentationComment(typeChecker: TypeChecker | undefined): SymbolDisplayPart[];
        getJsDocTags(): JSDocTagInfo[];
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface SourceFile {
        /** @internal */ version: string;
        /** @internal */ scriptSnapshot: IScriptSnapshot | undefined;
        /** @internal */ nameTable: Map<__String, number> | undefined;

        /** @internal */ getNamedDeclarations(): Map<string, readonly Declaration[]>;

        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
        getLineEndOfPosition(pos: number): number;
        getLineStarts(): readonly number[];
        getPositionOfLineAndCharacter(line: number, character: number): number;
        update(newText: string, textChangeRange: TextChangeRange): SourceFile;

        /** @internal */ sourceMapper?: DocumentPositionMapper;
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface SourceFileLike {
        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
    }
}

declare module "../compiler/types.js" {
    // Module transform: converted from interface augmentation
    export interface SourceMapSource {
        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
    }
}

/**
 * Represents an immutable snapshot of a script at a specified time.Once acquired, the
 * snapshot is observably immutable. i.e. the same calls with the same parameters will return
 * the same values.
 */
// eslint-disable-next-line @typescript-eslint/naming-convention
export interface IScriptSnapshot {
    /** Gets a portion of the script snapshot specified by [start, end). */
    getText(start: number, end: number): string;

    /** Gets the length of this script snapshot. */
    getLength(): number;

    /**
     * Gets the TextChangeRange that describe how the text changed between this text and
     * an older version.  This information is used by the incremental parser to determine
     * what sections of the script need to be re-parsed.  'undefined' can be returned if the
     * change range cannot be determined.  However, in that case, incremental parsing will
     * not happen and the entire document will be re - parsed.
     */
    getChangeRange(oldSnapshot: IScriptSnapshot): TextChangeRange | undefined;

    /** Releases all resources held by this script snapshot */
    dispose?(): void;
}

export namespace ScriptSnapshot {
    class StringScriptSnapshot implements IScriptSnapshot {
        constructor(private text: string) {
        }

        public getText(start: number, end: number): string {
            return start === 0 && end === this.text.length
                ? this.text
                : this.text.substring(start, end);
        }

        public getLength(): number {
            return this.text.length;
        }

        public getChangeRange(): TextChangeRange | undefined {
            // Text-based snapshots do not support incremental parsing. Return undefined
            // to signal that to the caller.
            return undefined;
        }
    }

    export function fromString(text: string): IScriptSnapshot {
        return new StringScriptSnapshot(text);
    }
}

export interface PreProcessedFileInfo {
    referencedFiles: FileReference[];
    typeReferenceDirectives: FileReference[];
    libReferenceDirectives: FileReference[];
    importedFiles: FileReference[];
    ambientExternalModules?: string[];
    isLibFile: boolean;
}

export interface HostCancellationToken {
    isCancellationRequested(): boolean;
}

export interface InstallPackageOptions {
    fileName: Path;
    packageName: string;
}

/** @internal */
export const enum PackageJsonDependencyGroup {
    Dependencies = 1 << 0,
    DevDependencies = 1 << 1,
    PeerDependencies = 1 << 2,
    OptionalDependencies = 1 << 3,
    All = Dependencies | DevDependencies | PeerDependencies | OptionalDependencies,
}

/** @internal */
export interface ProjectPackageJsonInfo {
    fileName: string;
    parseable: boolean;
    dependencies?: Map<string, string>;
    devDependencies?: Map<string, string>;
    peerDependencies?: Map<string, string>;
    optionalDependencies?: Map<string, string>;
    get(dependencyName: string, inGroups?: PackageJsonDependencyGroup): string | undefined;
    has(dependencyName: string, inGroups?: PackageJsonDependencyGroup): boolean;
}

/** @internal */
export interface FormattingHost {
    getNewLine?(): string;
}

/** @internal */
export const enum PackageJsonAutoImportPreference {
    Off,
    On,
    Auto,
}

export interface PerformanceEvent {
    kind: "UpdateGraph" | "CreatePackageJsonAutoImportProvider";
    durationMs: number;
}

export enum LanguageServiceMode {
    Semantic,
    PartialSemantic,
    Syntactic,
}

export interface IncompleteCompletionsCache {
    get(): CompletionInfo | undefined;
    set(response: CompletionInfo): void;
    clear(): void;
}

//
// Public interface of the host of a language service instance.
//
export interface LanguageServiceHost extends GetEffectiveTypeRootsHost, MinimalResolutionCacheHost {
    getCompilationSettings(): CompilerOptions;
    getNewLine?(): string;
    /** @internal */ updateFromProject?(): void;
    /** @internal */ updateFromProjectInProgress?: boolean;

    getProjectVersion?(): string;
    getScriptFileNames(): string[];
    getScriptKind?(fileName: string): ScriptKind;
    getScriptVersion(fileName: string): string;
    getScriptSnapshot(fileName: string): IScriptSnapshot | undefined;
    getProjectReferences?(): readonly ProjectReference[] | undefined;
    getLocalizedDiagnosticMessages?(): any;
    getCancellationToken?(): HostCancellationToken;
    getCurrentDirectory(): string;
    getDefaultLibFileName(options: CompilerOptions): string;
    log?(s: string): void;
    trace?(s: string): void;
    error?(s: string): void;
    useCaseSensitiveFileNames?(): boolean;

    /*
     * LS host can optionally implement these methods to support completions for module specifiers.
     * Without these methods, only completions for ambient modules will be provided.
     */
    readDirectory?(path: string, extensions?: readonly string[], exclude?: readonly string[], include?: readonly string[], depth?: number): string[];
    realpath?(path: string): string;
    /** @internal */ createHash?: ((data: string) => string) | undefined;

    /*
     * Unlike `realpath and `readDirectory`, `readFile` and `fileExists` are now _required_
     * to properly acquire and setup source files under module: node16+ modes.
     */
    readFile(path: string, encoding?: string): string | undefined;
    fileExists(path: string): boolean;

    /*
     * LS host can optionally implement these methods to support automatic updating when new type libraries are installed
     */
    getTypeRootsVersion?(): number;

    /*
     * LS host can optionally implement this method if it wants to be completely in charge of module name resolution.
     * if implementation is omitted then language service will use built-in module resolution logic and get answers to
     * host specific questions using 'getScriptSnapshot'.
     *
     * If this is implemented, `getResolvedModuleWithFailedLookupLocationsFromCache` should be too.
     */
    /** @deprecated supply resolveModuleNameLiterals instead for resolution that can handle newer resolution modes like nodenext */
    resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingSourceFile?: SourceFile): (ResolvedModule | undefined)[];
    getResolvedModuleWithFailedLookupLocationsFromCache?(modulename: string, containingFile: string, resolutionMode?: ResolutionMode): ResolvedModuleWithFailedLookupLocations | undefined;
    /** @deprecated supply resolveTypeReferenceDirectiveReferences instead for resolution that can handle newer resolution modes like nodenext */
    resolveTypeReferenceDirectives?(typeDirectiveNames: string[] | FileReference[], containingFile: string, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingFileMode?: ResolutionMode): (ResolvedTypeReferenceDirective | undefined)[];
    resolveModuleNameLiterals?(
        moduleLiterals: readonly StringLiteralLike[],
        containingFile: string,
        redirectedReference: ResolvedProjectReference | undefined,
        options: CompilerOptions,
        containingSourceFile: SourceFile,
        reusedNames: readonly StringLiteralLike[] | undefined,
    ): readonly ResolvedModuleWithFailedLookupLocations[];
    resolveTypeReferenceDirectiveReferences?<T extends FileReference | string>(
        typeDirectiveReferences: readonly T[],
        containingFile: string,
        redirectedReference: ResolvedProjectReference | undefined,
        options: CompilerOptions,
        containingSourceFile: SourceFile | undefined,
        reusedNames: readonly T[] | undefined,
    ): readonly ResolvedTypeReferenceDirectiveWithFailedLookupLocations[];
    /** @internal */
    resolveLibrary?(
        libraryName: string,
        resolveFrom: string,
        options: CompilerOptions,
        libFileName: string,
    ): ResolvedModuleWithFailedLookupLocations;
    /**
     * If provided along with custom resolveLibrary, used to determine if we should redo library resolutions
     * @internal
     */
    hasInvalidatedLibResolutions?: ((libFileName: string) => boolean) | undefined;

    /** @internal */ hasInvalidatedResolutions?: HasInvalidatedResolutions | undefined;
    /** @internal */ hasChangedAutomaticTypeDirectiveNames?: HasChangedAutomaticTypeDirectiveNames;
    /** @internal */ getGlobalTypingsCacheLocation?(): string | undefined;
    /** @internal */ getSymlinkCache?(files?: readonly SourceFile[]): SymlinkCache;
    /* Lets the Program from a AutoImportProviderProject use its host project's ModuleResolutionCache */
    /** @internal */ getModuleResolutionCache?(): ModuleResolutionCache | undefined;

    /*
     * Required for full import and type reference completions.
     * These should be unprefixed names. E.g. `getDirectories("/foo/bar")` should return `["a", "b"]`, not `["/foo/bar/a", "/foo/bar/b"]`.
     */
    getDirectories?(directoryName: string): string[];

    /**
     * Gets a set of custom transformers to use during emit.
     */
    getCustomTransformers?(): CustomTransformers | undefined;

    isKnownTypesPackageName?(name: string): boolean;
    installPackage?(options: InstallPackageOptions): Promise<ApplyCodeActionCommandResult>;
    writeFile?(fileName: string, content: string): void;

    /** @internal */ getDocumentPositionMapper?(generatedFileName: string, sourceFileName?: string): DocumentPositionMapper | undefined;
    /** @internal */ getSourceFileLike?(fileName: string): SourceFileLike | undefined;
    /** @internal */ getPackageJsonsVisibleToFile?(fileName: string, rootDir?: string): readonly ProjectPackageJsonInfo[];
    /** @internal */ getNearestAncestorDirectoryWithPackageJson?(fileName: string): string | undefined;
    /** @internal */ getPackageJsonsForAutoImport?(rootDir?: string): readonly ProjectPackageJsonInfo[];
    /** @internal */ getCachedExportInfoMap?(): ExportInfoMap;
    /** @internal */ getModuleSpecifierCache?(): ModuleSpecifierCache;
    /** @internal */ setCompilerHost?(host: CompilerHost): void;
    /** @internal */ useSourceOfProjectReferenceRedirect?(): boolean;
    /** @internal */ getPackageJsonAutoImportProvider?(): Program | undefined;
    /** @internal */ sendPerformanceEvent?(kind: PerformanceEvent["kind"], durationMs: number): void;
    getParsedCommandLine?(fileName: string): ParsedCommandLine | undefined;
    /** @internal */ onReleaseParsedCommandLine?(configFileName: string, oldResolvedRef: ResolvedProjectReference | undefined, optionOptions: CompilerOptions): void;
    /** @internal */ onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions, hasSourceFileByPath: boolean, newSourceFileByResolvedPath: SourceFile | undefined): void;
    /** @internal */ getIncompleteCompletionsCache?(): IncompleteCompletionsCache;
    /** @internal */ runWithTemporaryFileUpdate?(rootFile: string, updatedText: string, cb: (updatedProgram: Program, originalProgram: Program | undefined, updatedPastedText: SourceFile) => void): void;
    jsDocParsingMode?: JSDocParsingMode | undefined;
}

/** @internal */
export const emptyOptions = {};

export type WithMetadata<T> = T & { metadata?: unknown; };

export const enum SemanticClassificationFormat {
    Original = "original",
    TwentyTwenty = "2020",
}

/** @internal */
export interface RegionDiagnosticsResult {
    diagnostics: Diagnostic[];
    spans: TextSpan[];
}

//
// Public services of a language service instance associated
// with a language service host instance
//
export interface LanguageService {
    /** This is used as a part of restarting the language service. */
    cleanupSemanticCache(): void;

    /**
     * Gets errors indicating invalid syntax in a file.
     *
     * In English, "this cdeo have, erorrs" is syntactically invalid because it has typos,
     * grammatical errors, and misplaced punctuation. Likewise, examples of syntax
     * errors in TypeScript are missing parentheses in an `if` statement, mismatched
     * curly braces, and using a reserved keyword as a variable name.
     *
     * These diagnostics are inexpensive to compute and don't require knowledge of
     * other files. Note that a non-empty result increases the likelihood of false positives
     * from `getSemanticDiagnostics`.
     *
     * While these represent the majority of syntax-related diagnostics, there are some
     * that require the type system, which will be present in `getSemanticDiagnostics`.
     *
     * @param fileName A path to the file you want syntactic diagnostics for
     */
    getSyntacticDiagnostics(fileName: string): DiagnosticWithLocation[];

    /**
     * Gets warnings or errors indicating type system issues in a given file.
     * Requesting semantic diagnostics may start up the type system and
     * run deferred work, so the first call may take longer than subsequent calls.
     *
     * Unlike the other get*Diagnostics functions, these diagnostics can potentially not
     * include a reference to a source file. Specifically, the first time this is called,
     * it will return global diagnostics with no associated location.
     *
     * To contrast the differences between semantic and syntactic diagnostics, consider the
     * sentence: "The sun is green." is syntactically correct; those are real English words with
     * correct sentence structure. However, it is semantically invalid, because it is not true.
     *
     * @param fileName A path to the file you want semantic diagnostics for
     */
    getSemanticDiagnostics(fileName: string): Diagnostic[];

    /**
     * Similar to {@link getSemanticDiagnostics}, but only checks the specified ranges of the file for diagnostics.
     * @internal
     */
    getRegionSemanticDiagnostics(fileName: string, ranges: TextRange[]): RegionDiagnosticsResult | undefined;

    /**
     * Gets suggestion diagnostics for a specific file. These diagnostics tend to
     * proactively suggest refactors, as opposed to diagnostics that indicate
     * potentially incorrect runtime behavior.
     *
     * @param fileName A path to the file you want semantic diagnostics for
     */
    getSuggestionDiagnostics(fileName: string): DiagnosticWithLocation[];

    // TODO: Rename this to getProgramDiagnostics to better indicate that these are any
    // diagnostics present for the program level, and not just 'options' diagnostics.

    /**
     * Gets global diagnostics related to the program configuration and compiler options.
     */
    getCompilerOptionsDiagnostics(): Diagnostic[];

    /** @deprecated Use getEncodedSyntacticClassifications instead. */
    getSyntacticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
    getSyntacticClassifications(fileName: string, span: TextSpan, format: SemanticClassificationFormat): ClassifiedSpan[] | ClassifiedSpan2020[];

    /** @deprecated Use getEncodedSemanticClassifications instead. */
    getSemanticClassifications(fileName: string, span: TextSpan): ClassifiedSpan[];
    getSemanticClassifications(fileName: string, span: TextSpan, format: SemanticClassificationFormat): ClassifiedSpan[] | ClassifiedSpan2020[];

    /** Encoded as triples of [start, length, ClassificationType]. */
    getEncodedSyntacticClassifications(fileName: string, span: TextSpan): Classifications;

    /**
     * Gets semantic highlights information for a particular file. Has two formats, an older
     * version used by VS and a format used by VS Code.
     *
     * @param fileName The path to the file
     * @param position A text span to return results within
     * @param format Which format to use, defaults to "original"
     * @returns a number array encoded as triples of [start, length, ClassificationType, ...].
     */
    getEncodedSemanticClassifications(fileName: string, span: TextSpan, format?: SemanticClassificationFormat): Classifications;

    /**
     * Gets completion entries at a particular position in a file.
     *
     * @param fileName The path to the file
     * @param position A zero-based index of the character where you want the entries
     * @param options An object describing how the request was triggered and what kinds
     * of code actions can be returned with the completions.
     * @param formattingSettings settings needed for calling formatting functions.
     */
    getCompletionsAtPosition(fileName: string, position: number, options: GetCompletionsAtPositionOptions | undefined, formattingSettings?: FormatCodeSettings): WithMetadata<CompletionInfo> | undefined;

    /**
     * Gets the extended details for a completion entry retrieved from `getCompletionsAtPosition`.
     *
     * @param fileName The path to the file
     * @param position A zero based index of the character where you want the entries
     * @param entryName The `name` from an existing completion which came from `getCompletionsAtPosition`
     * @param formatOptions How should code samples in the completions be formatted, can be undefined for backwards compatibility
     * @param source `source` property from the completion entry
     * @param preferences User settings, can be undefined for backwards compatibility
     * @param data `data` property from the completion entry
     */
    getCompletionEntryDetails(
        fileName: string,
        position: number,
        entryName: string,
        formatOptions: FormatCodeOptions | FormatCodeSettings | undefined,
        source: string | undefined,
        preferences: UserPreferences | undefined,
        data: CompletionEntryData | undefined,
    ): CompletionEntryDetails | undefined;

    getCompletionEntrySymbol(fileName: string, position: number, name: string, source: string | undefined): Symbol | undefined;

    /**
     * Gets semantic information about the identifier at a particular position in a
     * file. Quick info is what you typically see when you hover in an editor.
     *
     * @param fileName The path to the file
     * @param position A zero-based index of the character where you want the quick info
     */
    getQuickInfoAtPosition(fileName: string, position: number): QuickInfo | undefined;

    getNameOrDottedNameSpan(fileName: string, startPos: number, endPos: number): TextSpan | undefined;

    getBreakpointStatementAtPosition(fileName: string, position: number): TextSpan | undefined;

    getSignatureHelpItems(fileName: string, position: number, options: SignatureHelpItemsOptions | undefined): SignatureHelpItems | undefined;

    getRenameInfo(fileName: string, position: number, preferences: UserPreferences): RenameInfo;
    /** @deprecated Use the signature with `UserPreferences` instead. */
    getRenameInfo(fileName: string, position: number, options?: RenameInfoOptions): RenameInfo;

    findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean, preferences: UserPreferences): readonly RenameLocation[] | undefined;
    /** @deprecated Pass `providePrefixAndSuffixTextForRename` as part of a `UserPreferences` parameter. */
    findRenameLocations(fileName: string, position: number, findInStrings: boolean, findInComments: boolean, providePrefixAndSuffixTextForRename?: boolean): readonly RenameLocation[] | undefined;

    getSmartSelectionRange(fileName: string, position: number): SelectionRange;

    /** @internal */
    getDefinitionAtPosition(fileName: string, position: number, searchOtherFilesOnly: false, stopAtAlias: boolean): readonly DefinitionInfo[] | undefined;
    /** @internal */
    getDefinitionAtPosition(fileName: string, position: number, searchOtherFilesOnly: boolean, stopAtAlias: false): readonly DefinitionInfo[] | undefined;
    getDefinitionAtPosition(fileName: string, position: number): readonly DefinitionInfo[] | undefined;
    getDefinitionAndBoundSpan(fileName: string, position: number): DefinitionInfoAndBoundSpan | undefined;
    getTypeDefinitionAtPosition(fileName: string, position: number): readonly DefinitionInfo[] | undefined;
    getImplementationAtPosition(fileName: string, position: number): readonly ImplementationLocation[] | undefined;

    getReferencesAtPosition(fileName: string, position: number): ReferenceEntry[] | undefined;
    findReferences(fileName: string, position: number): ReferencedSymbol[] | undefined;
    getDocumentHighlights(fileName: string, position: number, filesToSearch: string[]): DocumentHighlights[] | undefined;
    getFileReferences(fileName: string): ReferenceEntry[];

    getNavigateToItems(searchValue: string, maxResultCount?: number, fileName?: string, excludeDtsFiles?: boolean, excludeLibFiles?: boolean): NavigateToItem[];
    getNavigationBarItems(fileName: string): NavigationBarItem[];
    getNavigationTree(fileName: string): NavigationTree;

    prepareCallHierarchy(fileName: string, position: number): CallHierarchyItem | CallHierarchyItem[] | undefined;
    provideCallHierarchyIncomingCalls(fileName: string, position: number): CallHierarchyIncomingCall[];
    provideCallHierarchyOutgoingCalls(fileName: string, position: number): CallHierarchyOutgoingCall[];

    provideInlayHints(fileName: string, span: TextSpan, preferences: UserPreferences | undefined): InlayHint[];

    getOutliningSpans(fileName: string): OutliningSpan[];
    getTodoComments(fileName: string, descriptors: TodoCommentDescriptor[]): TodoComment[];
    getBraceMatchingAtPosition(fileName: string, position: number): TextSpan[];
    getIndentationAtPosition(fileName: string, position: number, options: EditorOptions | EditorSettings): number;

    getFormattingEditsForRange(fileName: string, start: number, end: number, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
    getFormattingEditsForDocument(fileName: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];
    getFormattingEditsAfterKeystroke(fileName: string, position: number, key: string, options: FormatCodeOptions | FormatCodeSettings): TextChange[];

    getDocCommentTemplateAtPosition(fileName: string, position: number, options?: DocCommentTemplateOptions, formatOptions?: FormatCodeSettings): TextInsertion | undefined;

    isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
    /**
     * This will return a defined result if the position is after the `>` of the opening tag, or somewhere in the text, of a JSXElement with no closing tag.
     * Editors should call this after `>` is typed.
     */
    getJsxClosingTagAtPosition(fileName: string, position: number): JsxClosingTagInfo | undefined;
    getLinkedEditingRangeAtPosition(fileName: string, position: number): LinkedEditingInfo | undefined;

    getSpanOfEnclosingComment(fileName: string, position: number, onlyMultiLine: boolean): TextSpan | undefined;

    toLineColumnOffset?(fileName: string, position: number): LineAndCharacter;
    /** @internal */
    getSourceMapper(): SourceMapper;
    /** @internal */
    clearSourceMapperCache(): void;

    getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: readonly number[], formatOptions: FormatCodeSettings, preferences: UserPreferences): readonly CodeFixAction[];
    getCombinedCodeFix(scope: CombinedCodeFixScope, fixId: {}, formatOptions: FormatCodeSettings, preferences: UserPreferences): CombinedCodeActions;

    applyCodeActionCommand(action: CodeActionCommand, formatSettings?: FormatCodeSettings): Promise<ApplyCodeActionCommandResult>;
    applyCodeActionCommand(action: CodeActionCommand[], formatSettings?: FormatCodeSettings): Promise<ApplyCodeActionCommandResult[]>;
    applyCodeActionCommand(action: CodeActionCommand | CodeActionCommand[], formatSettings?: FormatCodeSettings): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;
    /** @deprecated `fileName` will be ignored */
    applyCodeActionCommand(fileName: string, action: CodeActionCommand): Promise<ApplyCodeActionCommandResult>;
    /** @deprecated `fileName` will be ignored */
    applyCodeActionCommand(fileName: string, action: CodeActionCommand[]): Promise<ApplyCodeActionCommandResult[]>;
    /** @deprecated `fileName` will be ignored */
    applyCodeActionCommand(fileName: string, action: CodeActionCommand | CodeActionCommand[]): Promise<ApplyCodeActionCommandResult | ApplyCodeActionCommandResult[]>;

    /**
     * @param includeInteractiveActions Include refactor actions that require additional arguments to be
     * passed when calling `getEditsForRefactor`. When true, clients should inspect the `isInteractive`
     * property of each returned `RefactorActionInfo` and ensure they are able to collect the appropriate
     * arguments for any interactive action before offering it.
     */
    getApplicableRefactors(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined, triggerReason?: RefactorTriggerReason, kind?: string, includeInteractiveActions?: boolean): ApplicableRefactorInfo[];
    getEditsForRefactor(fileName: string, formatOptions: FormatCodeSettings, positionOrRange: number | TextRange, refactorName: string, actionName: string, preferences: UserPreferences | undefined, interactiveRefactorArguments?: InteractiveRefactorArguments): RefactorEditInfo | undefined;
    getMoveToRefactoringFileSuggestions(fileName: string, positionOrRange: number | TextRange, preferences: UserPreferences | undefined, triggerReason?: RefactorTriggerReason, kind?: string): { newFileName: string; files: string[]; };
    organizeImports(args: OrganizeImportsArgs, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): readonly FileTextChanges[];
    getEditsForFileRename(oldFilePath: string, newFilePath: string, formatOptions: FormatCodeSettings, preferences: UserPreferences | undefined): readonly FileTextChanges[];

    getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean, forceDtsEmit?: boolean): EmitOutput;

    getProgram(): Program | undefined;
    /** @internal */ getCurrentProgram(): Program | undefined;

    /** @internal */ getNonBoundSourceFile(fileName: string): SourceFile;
    /** @internal */ getAutoImportProvider(): Program | undefined;

    /// Returns true if a suitable symbol was found in the project.
    /// May set isDefinition properties in `referencedSymbols` to false.
    /// May add elements to `knownSymbolSpans`.
    /** @internal */ updateIsDefinitionOfReferencedSymbols(referencedSymbols: readonly ReferencedSymbol[], knownSymbolSpans: Set<DocumentSpan>): boolean;

    toggleLineComment(fileName: string, textRange: TextRange): TextChange[];
    toggleMultilineComment(fileName: string, textRange: TextRange): TextChange[];
    commentSelection(fileName: string, textRange: TextRange): TextChange[];
    uncommentSelection(fileName: string, textRange: TextRange): TextChange[];

    getSupportedCodeFixes(fileName?: string): readonly string[];

    /** @internal */ mapCode(fileName: string, contents: string[], focusLocations: TextSpan[][] | undefined, formatOptions: FormatCodeSettings, preferences: UserPreferences): readonly FileTextChanges[];
    /** @internal */ getImports(fileName: string): readonly string[];

    dispose(): void;
    preparePasteEditsForFile(fileName: string, copiedTextRanges: TextRange[]): boolean;
    getPasteEdits(
        args: PasteEditsArgs,
        formatOptions: FormatCodeSettings,
    ): PasteEdits;
}

export interface JsxClosingTagInfo {
    readonly newText: string;
}

export interface LinkedEditingInfo {
    readonly ranges: TextSpan[];
    wordPattern?: string;
}

export interface CombinedCodeFixScope {
    type: "file";
    fileName: string;
}

export const enum OrganizeImportsMode {
    All = "All",
    SortAndCombine = "SortAndCombine",
    RemoveUnused = "RemoveUnused",
}

export interface PasteEdits {
    edits: readonly FileTextChanges[];
    fixId?: {};
}

export interface PasteEditsArgs {
    targetFile: string;
    pastedText: string[];
    pasteLocations: TextRange[];
    copiedFrom: { file: string; range: TextRange[]; } | undefined;
    preferences: UserPreferences;
}

export interface OrganizeImportsArgs extends CombinedCodeFixScope {
    /** @deprecated Use `mode` instead */
    skipDestructiveCodeActions?: boolean;
    mode?: OrganizeImportsMode;
}

export type CompletionsTriggerCharacter = "." | '"' | "'" | "`" | "/" | "@" | "<" | "#" | " ";

export const enum CompletionTriggerKind {
    /** Completion was triggered by typing an identifier, manual invocation (e.g Ctrl+Space) or via API. */
    Invoked = 1,

    /** Completion was triggered by a trigger character. */
    TriggerCharacter = 2,

    /** Completion was re-triggered as the current completion list is incomplete. */
    TriggerForIncompleteCompletions = 3,
}

export interface GetCompletionsAtPositionOptions extends UserPreferences {
    /**
     * If the editor is asking for completions because a certain character was typed
     * (as opposed to when the user explicitly requested them) this should be set.
     */
    triggerCharacter?: CompletionsTriggerCharacter;
    triggerKind?: CompletionTriggerKind;
    /**
     * Include a `symbol` property on each completion entry object.
     * Symbols reference cyclic data structures and sometimes an entire TypeChecker instance,
     * so use caution when serializing or retaining completion entries retrieved with this option.
     * @default false
     */
    includeSymbol?: boolean;
    /** @deprecated Use includeCompletionsForModuleExports */
    includeExternalModuleExports?: boolean;
    /** @deprecated Use includeCompletionsWithInsertText */
    includeInsertTextCompletions?: boolean;
}

export type SignatureHelpTriggerCharacter = "," | "(" | "<";
export type SignatureHelpRetriggerCharacter = SignatureHelpTriggerCharacter | ")";

export interface SignatureHelpItemsOptions {
    triggerReason?: SignatureHelpTriggerReason;
}

export type SignatureHelpTriggerReason =
    | SignatureHelpInvokedReason
    | SignatureHelpCharacterTypedReason
    | SignatureHelpRetriggeredReason;

/**
 * Signals that the user manually requested signature help.
 * The language service will unconditionally attempt to provide a result.
 */
export interface SignatureHelpInvokedReason {
    kind: "invoked";
    triggerCharacter?: undefined;
}

/**
 * Signals that the signature help request came from a user typing a character.
 * Depending on the character and the syntactic context, the request may or may not be served a result.
 */
export interface SignatureHelpCharacterTypedReason {
    kind: "characterTyped";
    /**
     * Character that was responsible for triggering signature help.
     */
    triggerCharacter: SignatureHelpTriggerCharacter;
}

/**
 * Signals that this signature help request came from typing a character or moving the cursor.
 * This should only occur if a signature help session was already active and the editor needs to see if it should adjust.
 * The language service will unconditionally attempt to provide a result.
 * `triggerCharacter` can be `undefined` for a retrigger caused by a cursor move.
 */
export interface SignatureHelpRetriggeredReason {
    kind: "retrigger";
    /**
     * Character that was responsible for triggering signature help.
     */
    triggerCharacter?: SignatureHelpRetriggerCharacter;
}

export interface ApplyCodeActionCommandResult {
    successMessage: string;
}

export interface Classifications {
    spans: number[];
    endOfLineState: EndOfLineState;
}

export interface ClassifiedSpan {
    textSpan: TextSpan;
    classificationType: ClassificationTypeNames;
}

export interface ClassifiedSpan2020 {
    textSpan: TextSpan;
    classificationType: number;
}

/**
 * Navigation bar interface designed for visual studio's dual-column layout.
 * This does not form a proper tree.
 * The navbar is returned as a list of top-level items, each of which has a list of child items.
 * Child items always have an empty array for their `childItems`.
 */
export interface NavigationBarItem {
    text: string;
    kind: ScriptElementKind;
    kindModifiers: string;
    spans: TextSpan[];
    childItems: NavigationBarItem[];
    indent: number;
    bolded: boolean;
    grayed: boolean;
}

/**
 * Node in a tree of nested declarations in a file.
 * The top node is always a script or module node.
 */
export interface NavigationTree {
    /** Name of the declaration, or a short description, e.g. "<class>". */
    text: string;
    kind: ScriptElementKind;
    /** ScriptElementKindModifier separated by commas, e.g. "public,abstract" */
    kindModifiers: string;
    /**
     * Spans of the nodes that generated this declaration.
     * There will be more than one if this is the result of merging.
     */
    spans: TextSpan[];
    nameSpan: TextSpan | undefined;
    /** Present if non-empty */
    childItems?: NavigationTree[];
}

export interface CallHierarchyItem {
    name: string;
    kind: ScriptElementKind;
    kindModifiers?: string;
    file: string;
    span: TextSpan;
    selectionSpan: TextSpan;
    containerName?: string;
}

export interface CallHierarchyIncomingCall {
    from: CallHierarchyItem;
    fromSpans: TextSpan[];
}

export interface CallHierarchyOutgoingCall {
    to: CallHierarchyItem;
    fromSpans: TextSpan[];
}

export const enum InlayHintKind {
    Type = "Type",
    Parameter = "Parameter",
    Enum = "Enum",
}

export interface InlayHint {
    /** This property will be the empty string when displayParts is set. */
    text: string;
    position: number;
    kind: InlayHintKind;
    whitespaceBefore?: boolean;
    whitespaceAfter?: boolean;
    displayParts?: InlayHintDisplayPart[];
}

export interface InlayHintDisplayPart {
    text: string;
    span?: TextSpan;
    file?: string;
}

export interface TodoCommentDescriptor {
    text: string;
    priority: number;
}

export interface TodoComment {
    descriptor: TodoCommentDescriptor;
    message: string;
    position: number;
}

export interface TextChange {
    span: TextSpan;
    newText: string;
}

export interface FileTextChanges {
    fileName: string;
    textChanges: readonly TextChange[];
    isNewFile?: boolean;
}

export interface CodeAction {
    /** Description of the code action to display in the UI of the editor */
    description: string;
    /** Text changes to apply to each file as part of the code action */
    changes: FileTextChanges[];
    /**
     * If the user accepts the code fix, the editor should send the action back in a `applyAction` request.
     * This allows the language service to have side effects (e.g. installing dependencies) upon a code fix.
     */
    commands?: CodeActionCommand[];
}

export interface CodeFixAction extends CodeAction {
    /** Short name to identify the fix, for use by telemetry. */
    fixName: string;
    /**
     * If present, one may call 'getCombinedCodeFix' with this fixId.
     * This may be omitted to indicate that the code fix can't be applied in a group.
     */
    fixId?: {};
    fixAllDescription?: string;
}

export interface CombinedCodeActions {
    changes: readonly FileTextChanges[];
    commands?: readonly CodeActionCommand[];
}

// Publicly, this type is just `{}`. Internally it is a union of all the actions we use.
// See `commands?: {}[]` in protocol.ts
export type CodeActionCommand = InstallPackageAction;

export interface InstallPackageAction {
    /** @internal */ readonly type: "install package";
    /** @internal */ readonly file: string;
    /** @internal */ readonly packageName: string;
}

/**
 * A set of one or more available refactoring actions, grouped under a parent refactoring.
 */
export interface ApplicableRefactorInfo {
    /**
     * The programmatic name of the refactoring
     */
    name: string;
    /**
     * A description of this refactoring category to show to the user.
     * If the refactoring gets inlined (see below), this text will not be visible.
     */
    description: string;
    /**
     * Inlineable refactorings can have their actions hoisted out to the top level
     * of a context menu. Non-inlineanable refactorings should always be shown inside
     * their parent grouping.
     *
     * If not specified, this value is assumed to be 'true'
     */
    inlineable?: boolean;

    actions: RefactorActionInfo[];
}

/**
 * Represents a single refactoring action - for example, the "Extract Method..." refactor might
 * offer several actions, each corresponding to a surround class or closure to extract into.
 */
export interface RefactorActionInfo {
    /**
     * The programmatic name of the refactoring action
     */
    name: string;

    /**
     * A description of this refactoring action to show to the user.
     * If the parent refactoring is inlined away, this will be the only text shown,
     * so this description should make sense by itself if the parent is inlineable=true
     */
    description: string;

    /**
     * A message to show to the user if the refactoring cannot be applied in
     * the current context.
     */
    notApplicableReason?: string;

    /**
     * The hierarchical dotted name of the refactor action.
     */
    kind?: string;

    /**
     * Indicates that the action requires additional arguments to be passed
     * when calling `getEditsForRefactor`.
     */
    isInteractive?: boolean;

    /**
     * Range of code the refactoring will be applied to.
     */
    range?: { start: { line: number; offset: number; }; end: { line: number; offset: number; }; };
}

/**
 * A set of edits to make in response to a refactor action, plus an optional
 * location where renaming should be invoked from
 */
export interface RefactorEditInfo {
    edits: FileTextChanges[];
    renameFilename?: string;
    renameLocation?: number;
    commands?: CodeActionCommand[];
    notApplicableReason?: string;
}

export type RefactorTriggerReason = "implicit" | "invoked";

export interface TextInsertion {
    newText: string;
    /** The position in newText the caret should point to after the insertion. */
    caretOffset: number;
}

export interface DocumentSpan {
    textSpan: TextSpan;
    fileName: string;

    /**
     * If the span represents a location that was remapped (e.g. via a .d.ts.map file),
     * then the original filename and span will be specified here
     */
    originalTextSpan?: TextSpan;
    originalFileName?: string;

    /**
     * If DocumentSpan.textSpan is the span for name of the declaration,
     * then this is the span for relevant declaration
     */
    contextSpan?: TextSpan;
    originalContextSpan?: TextSpan;
}

export interface RenameLocation extends DocumentSpan {
    readonly prefixText?: string;
    readonly suffixText?: string;
}

export interface ReferenceEntry extends DocumentSpan {
    isWriteAccess: boolean;
    isInString?: true;
}

export interface ImplementationLocation extends DocumentSpan {
    kind: ScriptElementKind;
    displayParts: SymbolDisplayPart[];
}

export const enum HighlightSpanKind {
    none = "none",
    definition = "definition",
    reference = "reference",
    writtenReference = "writtenReference",
}

export interface HighlightSpan {
    fileName?: string;
    isInString?: true;
    textSpan: TextSpan;
    contextSpan?: TextSpan;
    kind: HighlightSpanKind;
}

export interface NavigateToItem {
    name: string;
    kind: ScriptElementKind;
    kindModifiers: string;
    matchKind: "exact" | "prefix" | "substring" | "camelCase";
    isCaseSensitive: boolean;
    fileName: string;
    textSpan: TextSpan;
    containerName: string;
    containerKind: ScriptElementKind;
}

export enum IndentStyle {
    None = 0,
    Block = 1,
    Smart = 2,
}

export enum SemicolonPreference {
    Ignore = "ignore",
    Insert = "insert",
    Remove = "remove",
}

/** @deprecated - consider using EditorSettings instead */
export interface EditorOptions {
    BaseIndentSize?: number;
    IndentSize: number;
    TabSize: number;
    NewLineCharacter: string;
    ConvertTabsToSpaces: boolean;
    IndentStyle: IndentStyle;
}

// TODO: GH#18217 These are frequently asserted as defined
export interface EditorSettings {
    baseIndentSize?: number;
    indentSize?: number;
    tabSize?: number;
    newLineCharacter?: string;
    convertTabsToSpaces?: boolean;
    indentStyle?: IndentStyle;
    trimTrailingWhitespace?: boolean;
}

/** @deprecated - consider using FormatCodeSettings instead */
export interface FormatCodeOptions extends EditorOptions {
    InsertSpaceAfterCommaDelimiter: boolean;
    InsertSpaceAfterSemicolonInForStatements: boolean;
    InsertSpaceBeforeAndAfterBinaryOperators: boolean;
    InsertSpaceAfterConstructor?: boolean;
    InsertSpaceAfterKeywordsInControlFlowStatements: boolean;
    InsertSpaceAfterFunctionKeywordForAnonymousFunctions: boolean;
    InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
    InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
    InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
    InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
    InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
    InsertSpaceAfterTypeAssertion?: boolean;
    InsertSpaceBeforeFunctionParenthesis?: boolean;
    PlaceOpenBraceOnNewLineForFunctions: boolean;
    PlaceOpenBraceOnNewLineForControlBlocks: boolean;
    insertSpaceBeforeTypeAnnotation?: boolean;
}

export interface FormatCodeSettings extends EditorSettings {
    readonly insertSpaceAfterCommaDelimiter?: boolean;
    readonly insertSpaceAfterSemicolonInForStatements?: boolean;
    readonly insertSpaceBeforeAndAfterBinaryOperators?: boolean;
    readonly insertSpaceAfterConstructor?: boolean;
    readonly insertSpaceAfterKeywordsInControlFlowStatements?: boolean;
    readonly insertSpaceAfterFunctionKeywordForAnonymousFunctions?: boolean;
    readonly insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis?: boolean;
    readonly insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets?: boolean;
    readonly insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces?: boolean;
    readonly insertSpaceAfterOpeningAndBeforeClosingEmptyBraces?: boolean;
    readonly insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces?: boolean;
    readonly insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
    readonly insertSpaceAfterTypeAssertion?: boolean;
    readonly insertSpaceBeforeFunctionParenthesis?: boolean;
    readonly placeOpenBraceOnNewLineForFunctions?: boolean;
    readonly placeOpenBraceOnNewLineForControlBlocks?: boolean;
    readonly insertSpaceBeforeTypeAnnotation?: boolean;
    readonly indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
    readonly semicolons?: SemicolonPreference;
    readonly indentSwitchCase?: boolean;
}

export function getDefaultFormatCodeSettings(newLineCharacter?: string): FormatCodeSettings {
    return {
        indentSize: 4,
        tabSize: 4,
        newLineCharacter: newLineCharacter || "\n",
        convertTabsToSpaces: true,
        indentStyle: IndentStyle.Smart,
        insertSpaceAfterConstructor: false,
        insertSpaceAfterCommaDelimiter: true,
        insertSpaceAfterSemicolonInForStatements: true,
        insertSpaceBeforeAndAfterBinaryOperators: true,
        insertSpaceAfterKeywordsInControlFlowStatements: true,
        insertSpaceAfterFunctionKeywordForAnonymousFunctions: false,
        insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: false,
        insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: false,
        insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces: true,
        insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: false,
        insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces: false,
        insertSpaceBeforeFunctionParenthesis: false,
        placeOpenBraceOnNewLineForFunctions: false,
        placeOpenBraceOnNewLineForControlBlocks: false,
        semicolons: SemicolonPreference.Ignore,
        trimTrailingWhitespace: true,
        indentSwitchCase: true,
    };
}

/** @internal */
export const testFormatSettings: FormatCodeSettings = getDefaultFormatCodeSettings("\n");

export interface DefinitionInfo extends DocumentSpan {
    kind: ScriptElementKind;
    name: string;
    containerKind: ScriptElementKind;
    containerName: string;
    unverified?: boolean;
    /** @internal
     * Initially, this value is determined syntactically, but it is updated by the checker to cover
     * cases like declarations that are exported in subsequent statements.  As a result, the value
     * may be "incomplete" if this span has yet to be checked.
     */
    isLocal?: boolean;
    /** @internal */ isAmbient?: boolean;
    /** @internal */ failedAliasResolution?: boolean;
}

export interface DefinitionInfoAndBoundSpan {
    definitions?: readonly DefinitionInfo[];
    textSpan: TextSpan;
}

export interface ReferencedSymbolDefinitionInfo extends DefinitionInfo {
    displayParts: SymbolDisplayPart[];
}

export interface ReferencedSymbol {
    definition: ReferencedSymbolDefinitionInfo;
    references: ReferencedSymbolEntry[];
}

export interface ReferencedSymbolEntry extends ReferenceEntry {
    isDefinition?: boolean;
}

export enum SymbolDisplayPartKind {
    aliasName,
    className,
    enumName,
    fieldName,
    interfaceName,
    keyword,
    lineBreak,
    numericLiteral,
    stringLiteral,
    localName,
    methodName,
    moduleName,
    operator,
    parameterName,
    propertyName,
    punctuation,
    space,
    text,
    typeParameterName,
    enumMemberName,
    functionName,
    regularExpressionLiteral,
    link,
    linkName,
    linkText,
}

export interface SymbolDisplayPart {
    /**
     * Text of an item describing the symbol.
     */
    text: string;
    /**
     * The symbol's kind (such as 'className' or 'parameterName' or plain 'text').
     */
    kind: string;
}

export interface JSDocLinkDisplayPart extends SymbolDisplayPart {
    target: DocumentSpan;
}

export interface JSDocTagInfo {
    name: string;
    text?: SymbolDisplayPart[];
}

export interface QuickInfo {
    kind: ScriptElementKind;
    kindModifiers: string;
    textSpan: TextSpan;
    displayParts?: SymbolDisplayPart[];
    documentation?: SymbolDisplayPart[];
    tags?: JSDocTagInfo[];
}

export type RenameInfo = RenameInfoSuccess | RenameInfoFailure;
export interface RenameInfoSuccess {
    canRename: true;
    /**
     * File or directory to rename.
     * If set, `getEditsForFileRename` should be called instead of `findRenameLocations`.
     */
    fileToRename?: string;
    displayName: string;
    /**
     * Full display name of item to be renamed.
     * If item to be renamed is a file, then this is the original text of the module specifer
     */
    fullDisplayName: string;
    kind: ScriptElementKind;
    kindModifiers: string;
    triggerSpan: TextSpan;
}
export interface RenameInfoFailure {
    canRename: false;
    localizedErrorMessage: string;
}

/**
 * @deprecated Use `UserPreferences` instead.
 */
export interface RenameInfoOptions {
    readonly allowRenameOfImportPath?: boolean;
}

export interface DocCommentTemplateOptions {
    readonly generateReturnInDocTemplate?: boolean;
}

export interface InteractiveRefactorArguments {
    targetFile: string;
}

/**
 * Signature help information for a single parameter
 */
export interface SignatureHelpParameter {
    name: string;
    documentation: SymbolDisplayPart[];
    displayParts: SymbolDisplayPart[];
    isOptional: boolean;
    isRest?: boolean;
}

export interface SelectionRange {
    textSpan: TextSpan;
    parent?: SelectionRange;
}

/**
 * Represents a single signature to show in signature help.
 * The id is used for subsequent calls into the language service to ask questions about the
 * signature help item in the context of any documents that have been updated.  i.e. after
 * an edit has happened, while signature help is still active, the host can ask important
 * questions like 'what parameter is the user currently contained within?'.
 */
export interface SignatureHelpItem {
    isVariadic: boolean;
    prefixDisplayParts: SymbolDisplayPart[];
    suffixDisplayParts: SymbolDisplayPart[];
    separatorDisplayParts: SymbolDisplayPart[];
    parameters: SignatureHelpParameter[];
    documentation: SymbolDisplayPart[];
    tags: JSDocTagInfo[];
}

/**
 * Represents a set of signature help items, and the preferred item that should be selected.
 */
export interface SignatureHelpItems {
    items: SignatureHelpItem[];
    applicableSpan: TextSpan;
    selectedItemIndex: number;
    argumentIndex: number;
    argumentCount: number;
}

// Do not change existing values, as they exist in telemetry.
export const enum CompletionInfoFlags {
    None = 0,
    MayIncludeAutoImports = 1 << 0,
    IsImportStatementCompletion = 1 << 1,
    IsContinuation = 1 << 2,
    ResolvedModuleSpecifiers = 1 << 3,
    ResolvedModuleSpecifiersBeyondLimit = 1 << 4,
    MayIncludeMethodSnippets = 1 << 5,
}

export interface CompletionInfo {
    /** For performance telemetry. */
    flags?: CompletionInfoFlags;
    /** Not true for all global completions. This will be true if the enclosing scope matches a few syntax kinds. See `isSnippetScope`. */
    isGlobalCompletion: boolean;
    isMemberCompletion: boolean;
    /**
     * In the absence of `CompletionEntry["replacementSpan"]`, the editor may choose whether to use
     * this span or its default one. If `CompletionEntry["replacementSpan"]` is defined, that span
     * must be used to commit that completion entry.
     */
    optionalReplacementSpan?: TextSpan;
    /**
     * true when the current location also allows for a new identifier
     */
    isNewIdentifierLocation: boolean;
    /**
     * Indicates to client to continue requesting completions on subsequent keystrokes.
     */
    isIncomplete?: true;
    entries: CompletionEntry[];
    /**
     * Default commit characters for the completion entries.
     */
    defaultCommitCharacters?: string[];
}

export interface CompletionEntryDataAutoImport {
    /**
     * The name of the property or export in the module's symbol table. Differs from the completion name
     * in the case of InternalSymbolName.ExportEquals and InternalSymbolName.Default.
     */
    exportName: string;
    exportMapKey?: ExportMapInfoKey;
    moduleSpecifier?: string;
    /** The file name declaring the export's module symbol, if it was an external module */
    fileName?: string;
    /** The module name (with quotes stripped) of the export's module symbol, if it was an ambient module */
    ambientModuleName?: string;
    /** True if the export was found in the package.json AutoImportProvider */
    isPackageJsonImport?: true;
}

export interface CompletionEntryDataUnresolved extends CompletionEntryDataAutoImport {
    exportMapKey: ExportMapInfoKey;
}

export interface CompletionEntryDataResolved extends CompletionEntryDataAutoImport {
    moduleSpecifier: string;
}

export type CompletionEntryData = CompletionEntryDataUnresolved | CompletionEntryDataResolved;

// see comments in protocol.ts
export interface CompletionEntry {
    name: string;
    kind: ScriptElementKind;
    kindModifiers?: string; // see ScriptElementKindModifier, comma separated
    /**
     * A string that is used for comparing completion items so that they can be ordered. This
     * is often the same as the name but may be different in certain circumstances.
     */
    sortText: string;
    /**
     * Text to insert instead of `name`.
     * This is used to support bracketed completions; If `name` might be "a-b" but `insertText` would be `["a-b"]`,
     * coupled with `replacementSpan` to replace a dotted access with a bracket access.
     */
    insertText?: string;
    /**
     * A string that should be used when filtering a set of
     * completion items.
     */
    filterText?: string;
    /**
     * `insertText` should be interpreted as a snippet if true.
     */
    isSnippet?: true;
    /**
     * An optional span that indicates the text to be replaced by this completion item.
     * If present, this span should be used instead of the default one.
     * It will be set if the required span differs from the one generated by the default replacement behavior.
     */
    replacementSpan?: TextSpan;
    /**
     * Indicates whether commiting this completion entry will require additional code actions to be
     * made to avoid errors. The CompletionEntryDetails will have these actions.
     */
    hasAction?: true;
    /**
     * Identifier (not necessarily human-readable) identifying where this completion came from.
     */
    source?: string;
    /**
     * Human-readable description of the `source`.
     */
    sourceDisplay?: SymbolDisplayPart[];
    /**
     * Additional details for the label.
     */
    labelDetails?: CompletionEntryLabelDetails;
    /**
     * If true, this completion should be highlighted as recommended. There will only be one of these.
     * This will be set when we know the user should write an expression with a certain type and that type is an enum or constructable class.
     * Then either that enum/class or a namespace containing it will be the recommended symbol.
     */
    isRecommended?: true;
    /**
     * If true, this completion was generated from traversing the name table of an unchecked JS file,
     * and therefore may not be accurate.
     */
    isFromUncheckedFile?: true;
    /**
     * If true, this completion was for an auto-import of a module not yet in the program, but listed
     * in the project package.json. Used for telemetry reporting.
     */
    isPackageJsonImport?: true;
    /**
     * If true, this completion was an auto-import-style completion of an import statement (i.e., the
     * module specifier was inserted along with the imported identifier). Used for telemetry reporting.
     */
    isImportStatementCompletion?: true;
    /**
     * For API purposes.
     * Included for non-string completions only when `includeSymbol: true` option is passed to `getCompletionsAtPosition`.
     * @example Get declaration of completion: `symbol.valueDeclaration`
     */
    symbol?: Symbol;
    /**
     * A property to be sent back to TS Server in the CompletionDetailsRequest, along with `name`,
     * that allows TS Server to look up the symbol represented by the completion item, disambiguating
     * items with the same name. Currently only defined for auto-import completions, but the type is
     * `unknown` in the protocol, so it can be changed as needed to support other kinds of completions.
     * The presence of this property should generally not be used to assume that this completion entry
     * is an auto-import.
     */
    data?: CompletionEntryData;
    /**
     * If this completion entry is selected, typing a commit character will cause the entry to be accepted.
     */
    commitCharacters?: string[];
}

export interface CompletionEntryLabelDetails {
    /**
     * An optional string which is rendered less prominently directly after
     * {@link CompletionEntry.name name}, without any spacing. Should be
     * used for function signatures or type annotations.
     */
    detail?: string;
    /**
     * An optional string which is rendered less prominently after
     * {@link CompletionEntryLabelDetails.detail}. Should be used for fully qualified
     * names or file path.
     */
    description?: string;
}

export interface CompletionEntryDetails {
    name: string;
    kind: ScriptElementKind;
    kindModifiers: string; // see ScriptElementKindModifier, comma separated
    displayParts: SymbolDisplayPart[];
    documentation?: SymbolDisplayPart[];
    tags?: JSDocTagInfo[];
    codeActions?: CodeAction[];
    /** @deprecated Use `sourceDisplay` instead. */
    source?: SymbolDisplayPart[];
    sourceDisplay?: SymbolDisplayPart[];
}

export interface OutliningSpan {
    /** The span of the document to actually collapse. */
    textSpan: TextSpan;

    /** The span of the document to display when the user hovers over the collapsed span. */
    hintSpan: TextSpan;

    /** The text to display in the editor for the collapsed region. */
    bannerText: string;

    /**
     * Whether or not this region should be automatically collapsed when
     * the 'Collapse to Definitions' command is invoked.
     */
    autoCollapse: boolean;

    /**
     * Classification of the contents of the span
     */
    kind: OutliningSpanKind;
}

export const enum OutliningSpanKind {
    /** Single or multi-line comments */
    Comment = "comment",

    /** Sections marked by '// #region' and '// #endregion' comments */
    Region = "region",

    /** Declarations and expressions */
    Code = "code",

    /** Contiguous blocks of import declarations */
    Imports = "imports",
}

export const enum OutputFileType {
    JavaScript,
    SourceMap,
    Declaration,
}

export const enum EndOfLineState {
    None,
    InMultiLineCommentTrivia,
    InSingleQuoteStringLiteral,
    InDoubleQuoteStringLiteral,
    InTemplateHeadOrNoSubstitutionTemplate,
    InTemplateMiddleOrTail,
    InTemplateSubstitutionPosition,
}

export enum TokenClass {
    Punctuation,
    Keyword,
    Operator,
    Comment,
    Whitespace,
    Identifier,
    NumberLiteral,
    BigIntLiteral,
    StringLiteral,
    RegExpLiteral,
}

export interface ClassificationResult {
    finalLexState: EndOfLineState;
    entries: ClassificationInfo[];
}

export interface ClassificationInfo {
    length: number;
    classification: TokenClass;
}

export interface Classifier {
    /**
     * Gives lexical classifications of tokens on a line without any syntactic context.
     * For instance, a token consisting of the text 'string' can be either an identifier
     * named 'string' or the keyword 'string', however, because this classifier is not aware,
     * it relies on certain heuristics to give acceptable results. For classifications where
     * speed trumps accuracy, this function is preferable; however, for true accuracy, the
     * syntactic classifier is ideal. In fact, in certain editing scenarios, combining the
     * lexical, syntactic, and semantic classifiers may issue the best user experience.
     *
     * @param text                      The text of a line to classify.
     * @param lexState                  The state of the lexical classifier at the end of the previous line.
     * @param syntacticClassifierAbsent Whether the client is *not* using a syntactic classifier.
     *                                  If there is no syntactic classifier (syntacticClassifierAbsent=true),
     *                                  certain heuristics may be used in its place; however, if there is a
     *                                  syntactic classifier (syntacticClassifierAbsent=false), certain
     *                                  classifications which may be incorrectly categorized will be given
     *                                  back as Identifiers in order to allow the syntactic classifier to
     *                                  subsume the classification.
     * @deprecated Use getLexicalClassifications instead.
     */
    getClassificationsForLine(text: string, lexState: EndOfLineState, syntacticClassifierAbsent: boolean): ClassificationResult;
    getEncodedLexicalClassifications(text: string, endOfLineState: EndOfLineState, syntacticClassifierAbsent: boolean): Classifications;
}

export const enum ScriptElementKind {
    unknown = "",
    warning = "warning",

    /** predefined type (void) or keyword (class) */
    keyword = "keyword",

    /** top level script node */
    scriptElement = "script",

    /** module foo {} */
    moduleElement = "module",

    /** class X {} */
    classElement = "class",

    /** var x = class X {} */
    localClassElement = "local class",

    /** interface Y {} */
    interfaceElement = "interface",

    /** type T = ... */
    typeElement = "type",

    /** enum E */
    enumElement = "enum",
    enumMemberElement = "enum member",

    /**
     * Inside module and script only
     * const v = ..
     */
    variableElement = "var",

    /** Inside function */
    localVariableElement = "local var",

    /** using foo = ... */
    variableUsingElement = "using",

    /** await using foo = ... */
    variableAwaitUsingElement = "await using",

    /**
     * Inside module and script only
     * function f() { }
     */
    functionElement = "function",

    /** Inside function */
    localFunctionElement = "local function",

    /** class X { [public|private]* foo() {} } */
    memberFunctionElement = "method",

    /** class X { [public|private]* [get|set] foo:number; } */
    memberGetAccessorElement = "getter",
    memberSetAccessorElement = "setter",

    /**
     * class X { [public|private]* foo:number; }
     * interface Y { foo:number; }
     */
    memberVariableElement = "property",

    /** class X { [public|private]* accessor foo: number; } */
    memberAccessorVariableElement = "accessor",

    /**
     * class X { constructor() { } }
     * class X { static { } }
     */
    constructorImplementationElement = "constructor",

    /** interface Y { ():number; } */
    callSignatureElement = "call",

    /** interface Y { []:number; } */
    indexSignatureElement = "index",

    /** interface Y { new():Y; } */
    constructSignatureElement = "construct",

    /** function foo(*Y*: string) */
    parameterElement = "parameter",

    typeParameterElement = "type parameter",

    primitiveType = "primitive type",

    label = "label",

    alias = "alias",

    constElement = "const",

    letElement = "let",

    directory = "directory",

    externalModuleName = "external module name",

    /**
     * <JsxTagName attribute1 attribute2={0} />
     * @deprecated
     */
    jsxAttribute = "JSX attribute",

    /** String literal */
    string = "string",

    /** Jsdoc @link: in `{@link C link text}`, the before and after text "{@link " and "}" */
    link = "link",

    /** Jsdoc @link: in `{@link C link text}`, the entity name "C" */
    linkName = "link name",

    /** Jsdoc @link: in `{@link C link text}`, the link text "link text" */
    linkText = "link text",
}

export const enum ScriptElementKindModifier {
    none = "",
    publicMemberModifier = "public",
    privateMemberModifier = "private",
    protectedMemberModifier = "protected",
    exportedModifier = "export",
    ambientModifier = "declare",
    staticModifier = "static",
    abstractModifier = "abstract",
    optionalModifier = "optional",

    deprecatedModifier = "deprecated",

    dtsModifier = ".d.ts",
    tsModifier = ".ts",
    tsxModifier = ".tsx",
    jsModifier = ".js",
    jsxModifier = ".jsx",
    jsonModifier = ".json",
    dmtsModifier = ".d.mts",
    mtsModifier = ".mts",
    mjsModifier = ".mjs",
    dctsModifier = ".d.cts",
    ctsModifier = ".cts",
    cjsModifier = ".cjs",
}

export const enum ClassificationTypeNames {
    comment = "comment",
    identifier = "identifier",
    keyword = "keyword",
    numericLiteral = "number",
    bigintLiteral = "bigint",
    operator = "operator",
    stringLiteral = "string",
    whiteSpace = "whitespace",
    text = "text",

    punctuation = "punctuation",

    className = "class name",
    enumName = "enum name",
    interfaceName = "interface name",
    moduleName = "module name",
    typeParameterName = "type parameter name",
    typeAliasName = "type alias name",
    parameterName = "parameter name",
    docCommentTagName = "doc comment tag name",
    jsxOpenTagName = "jsx open tag name",
    jsxCloseTagName = "jsx close tag name",
    jsxSelfClosingTagName = "jsx self closing tag name",
    jsxAttribute = "jsx attribute",
    jsxText = "jsx text",
    jsxAttributeStringLiteralValue = "jsx attribute string literal value",
}

export const enum ClassificationType {
    comment = 1,
    identifier = 2,
    keyword = 3,
    numericLiteral = 4,
    operator = 5,
    stringLiteral = 6,
    regularExpressionLiteral = 7,
    whiteSpace = 8,
    text = 9,
    punctuation = 10,
    className = 11,
    enumName = 12,
    interfaceName = 13,
    moduleName = 14,
    typeParameterName = 15,
    typeAliasName = 16,
    parameterName = 17,
    docCommentTagName = 18,
    jsxOpenTagName = 19,
    jsxCloseTagName = 20,
    jsxSelfClosingTagName = 21,
    jsxAttribute = 22,
    jsxText = 23,
    jsxAttributeStringLiteralValue = 24,
    bigintLiteral = 25,
}

/** @internal */
export interface CodeFixRegistration {
    errorCodes: readonly number[];
    getCodeActions(context: CodeFixContext): CodeFixAction[] | undefined;
    fixIds?: readonly string[];
    getAllCodeActions?(context: CodeFixAllContext): CombinedCodeActions;
}

/** @internal */
export interface CodeFixContextBase extends textChanges.TextChangesContext {
    sourceFile: SourceFile;
    program: Program;
    cancellationToken: CancellationToken;
    preferences: UserPreferences;
}

/** @internal */
export interface CodeFixAllContext extends CodeFixContextBase {
    fixId: {};
}

/** @internal */
export interface CodeFixContext extends CodeFixContextBase {
    errorCode: number;
    span: TextSpan;
}

/** @internal */
export interface Refactor {
    /** List of action kinds a refactor can provide.
     * Used to skip unnecessary calculation when specific refactors are requested. */
    kinds?: string[];

    /** Compute the associated code actions */
    getEditsForAction(context: RefactorContext, actionName: string, interactiveRefactorArguments?: InteractiveRefactorArguments): RefactorEditInfo | undefined;

    /** Compute (quickly) which actions are available here */
    getAvailableActions(context: RefactorContext, includeInteractive?: boolean, interactiveRefactorArguments?: InteractiveRefactorArguments): readonly ApplicableRefactorInfo[];
}

/** @internal */
export interface RefactorContext extends textChanges.TextChangesContext {
    file: SourceFile;
    startPosition: number;
    endPosition?: number;
    program: Program;
    cancellationToken?: CancellationToken;
    preferences: UserPreferences;
    triggerReason?: RefactorTriggerReason;
    kind?: string;
}

export interface InlayHintsContext {
    file: SourceFile;
    program: Program;
    cancellationToken: CancellationToken;
    host: LanguageServiceHost;
    span: TextSpan;
    preferences: UserPreferences;
}