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feat(compiler): expose TsCompiler as public api #2344

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Feb 9, 2021
Merged

feat(compiler): expose TsCompiler as public api #2344

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93 changes: 58 additions & 35 deletions src/compiler/ts-compiler.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,28 +15,41 @@ import type {
TransformerFactory,
Bundle,
CustomTransformerFactory,
CustomTransformers,
} from 'typescript'

import type { ConfigSet } from '../config/config-set'
import { LINE_FEED } from '../constants'
import type { ResolvedModulesMap, StringMap, TsCompilerInstance, TTypeScript } from '../types'
import type { ResolvedModulesMap, StringMap, TsCompilerInstance, TsJestAstTransformer, TTypeScript } from '../types'
import { rootLogger } from '../utils/logger'
import { Errors, interpolate } from '../utils/messages'

import { updateOutput } from './compiler-utils'

/**
* @internal
*/
export class TsCompiler implements TsCompilerInstance {
private readonly _logger: Logger
private readonly _ts: TTypeScript
protected readonly _logger: Logger
protected readonly _ts: TTypeScript
protected readonly _initialCompilerOptions: CompilerOptions
protected _compilerOptions: CompilerOptions
/**
* @internal
*/
private readonly _parsedTsConfig: ParsedCommandLine
/**
* @internal
*/
private readonly _compilerCacheFS: Map<string, number> = new Map<string, number>()
private readonly _initialCompilerOptions: CompilerOptions
private _compilerOptions: CompilerOptions
/**
* @internal
*/
private _cachedReadFile: ((fileName: string) => string | undefined) | undefined
/**
* @internal
*/
private _projectVersion = 1
/**
* @internal
*/
private _languageService: LanguageService | undefined
program: Program | undefined

Expand All @@ -51,6 +64,9 @@ export class TsCompiler implements TsCompilerInstance {
}
}

/**
* @internal
*/
private _createLanguageService(): void {
const serviceHostTraceCtx = {
namespace: 'ts:serviceHost',
Expand Down Expand Up @@ -122,17 +138,7 @@ export class TsCompiler implements TsCompilerInstance {
getCurrentDirectory: () => this.configSet.cwd,
getCompilationSettings: () => this._compilerOptions,
getDefaultLibFileName: () => this._ts.getDefaultLibFilePath(this._compilerOptions),
getCustomTransformers: () => ({
before: this.configSet.resolvedTransformers.before.map((beforeTransformer) =>
beforeTransformer.factory(this, beforeTransformer.options),
) as (TransformerFactory<SourceFile> | CustomTransformerFactory)[],
after: this.configSet.resolvedTransformers.after.map((afterTransformer) =>
afterTransformer.factory(this, afterTransformer.options),
) as (TransformerFactory<SourceFile> | CustomTransformerFactory)[],
afterDeclarations: this.configSet.resolvedTransformers.afterDeclarations.map((afterDeclarations) =>
afterDeclarations.factory(this, afterDeclarations.options),
) as TransformerFactory<SourceFile | Bundle>[],
}),
getCustomTransformers: () => this._makeTransformers(this.configSet.resolvedTransformers),
resolveModuleNames: (moduleNames: string[], containingFile: string): (ResolvedModuleFull | undefined)[] =>
moduleNames.map((moduleName) => {
const { resolvedModule } = this._ts.resolveModuleName(
Expand Down Expand Up @@ -210,22 +216,7 @@ export class TsCompiler implements TsCompilerInstance {
} else {
this._logger.debug({ fileName }, 'getCompiledOutput(): compiling as isolated module')

const result: TranspileOutput = this._ts.transpileModule(fileContent, {
fileName,
transformers: {
before: this.configSet.resolvedTransformers.before.map((beforeTransformer) =>
beforeTransformer.factory(this, beforeTransformer.options),
) as (TransformerFactory<SourceFile> | CustomTransformerFactory)[],
after: this.configSet.resolvedTransformers.after.map((afterTransformer) =>
afterTransformer.factory(this, afterTransformer.options),
) as (TransformerFactory<SourceFile> | CustomTransformerFactory)[],
afterDeclarations: this.configSet.resolvedTransformers.afterDeclarations.map((afterDeclarations) =>
afterDeclarations.factory(this, afterDeclarations.options),
) as TransformerFactory<SourceFile | Bundle>[],
},
compilerOptions: this._compilerOptions,
reportDiagnostics: this.configSet.shouldReportDiagnostics(fileName),
})
const result: TranspileOutput = this._transpileOutput(fileContent, fileName)
if (result.diagnostics && this.configSet.shouldReportDiagnostics(fileName)) {
this.configSet.raiseDiagnostics(result.diagnostics, fileName, this._logger)
}
Expand All @@ -235,12 +226,41 @@ export class TsCompiler implements TsCompilerInstance {
}
}

protected _transpileOutput(fileContent: string, fileName: string): TranspileOutput {
return this._ts.transpileModule(fileContent, {
fileName,
transformers: this._makeTransformers(this.configSet.resolvedTransformers),
compilerOptions: this._compilerOptions,
reportDiagnostics: this.configSet.shouldReportDiagnostics(fileName),
})
}

protected _makeTransformers(customTransformers: TsJestAstTransformer): CustomTransformers {
return {
before: customTransformers.before.map((beforeTransformer) =>
beforeTransformer.factory(this, beforeTransformer.options),
) as (TransformerFactory<SourceFile> | CustomTransformerFactory)[],
after: customTransformers.after.map((afterTransformer) =>
afterTransformer.factory(this, afterTransformer.options),
) as (TransformerFactory<SourceFile> | CustomTransformerFactory)[],
afterDeclarations: customTransformers.afterDeclarations.map((afterDeclarations) =>
afterDeclarations.factory(this, afterDeclarations.options),
) as TransformerFactory<SourceFile | Bundle>[],
}
}

/**
* @internal
*/
private _isFileInCache(fileName: string): boolean {
return (
this.jestCacheFS.has(fileName) && this._compilerCacheFS.has(fileName) && this._compilerCacheFS.get(fileName) !== 0
)
}

/**
* @internal
*/
/* istanbul ignore next */
private _updateMemoryCache(contents: string, fileName: string): void {
this._logger.debug({ fileName }, 'updateMemoryCache: update memory cache for language service')
Expand Down Expand Up @@ -271,6 +291,9 @@ export class TsCompiler implements TsCompilerInstance {
if (shouldIncrementProjectVersion) this._projectVersion++
}

/**
* @internal
*/
private _doTypeChecking(fileName: string): void {
if (this.configSet.shouldReportDiagnostics(fileName)) {
// Get the relevant diagnostics - this is 3x faster than `getPreEmitDiagnostics`.
Expand Down