feat(config): specify package.json location (#823)

docs/user/config/index.md

@@ -193,6 +193,7 @@ All options have default values which should fit most of the projects. Click on
 | [**`diagnostics`**][diagnostics] | [Diagnostics related configuration.][diagnostics] | `boolean`\|`object` | `true` |
 | [**`babelConfig`**][babelConfig] | [Babel(Jest) related configuration.][babelConfig] | `boolean`\|`object` | _disabled_ |
 | [**`stringifyContentPathRegex`**][stringifyContentPathRegex] | [Files which will become modules returning self content.][stringifyContentPathRegex] | `string`\|`RegExp` | _disabled_ |
+| [**`packageJson`**][packageJson] | [Package metadata.][packageJson] | `string`\|`object`\|`boolean` | _auto_ |
 
 ### Upgrading
 
@@ -222,3 +223,4 @@ npx ts-jest config:migrate package.json
 [diagnostics]: diagnostics
 [babelConfig]: babelConfig
 [stringifyContentPathRegex]: stringifyContentPathRegex
+[packageJson]: packageJson

docs/user/config/packageJson.md

@@ -0,0 +1,69 @@
+---
+title: packageJson Config option
+---
+
+The `packageJson` option specifies the `package.json` file to use. An inline object may also be specified instead of a file path.
+
+By default, the `package.json` file at the root of the project will be used. If it cannot be found, an empty project definition will be used instead.
+
+### Examples
+
+#### Path to a `packageJson` file
+
+The path should be relative to the current working directory where you start Jest from. You can also use `<rootDir>` in the path to start from the project root dir.
+
+<div class="row"><div class="col-md-6" markdown="block">
+
+```js
+// jest.config.js
+module.exports = {
+  // [...]
+  globals: {
+    'ts-jest': {
+      packageJson: 'package.json'
+    }
+  }
+};
+```
+
+</div><div class="col-md-6" markdown="block">
+
+```js
+// OR from a non-trivial path
+// jest.config.js
+module.exports = {
+  // [...]
+  globals: {
+    'ts-jest': {
+      packageJson: '<rootDir>/../../shared/package.json'
+    }
+  }
+};
+```
+
+</div></div>
+
+#### Inline package metadata
+
+<div class="row"><div class="col-md-12" markdown="block">
+
+```js
+// jest.config.js
+module.exports = {
+  // [...]
+  globals: {
+    'ts-jest': {
+      packageJson: {
+          "name": "my-project",
+          "version": "1.0.0",
+          "dependencies": {
+            // [...]
+          }
+      }
+    }
+  }
+};
+```
+
+</div></div>
+

src/__helpers__/fakers.ts

@@ -60,6 +60,7 @@ export function tsJestConfig(options?: Partial<TsJestConfig>): TsJestConfig {
     transformers: [],
     babelConfig: undefined,
     tsConfig: undefined,
+    packageJson: undefined,
     stringifyContentPathRegex: undefined,
     diagnostics: { ignoreCodes: [], pretty: false, throws: true },
     ...options,

src/config/__snapshots__/config-set.spec.ts.snap

@@ -32,6 +32,10 @@ Object {
     "throws": true,
   },
   "isolatedModules": false,
+  "packageJson": Object {
+    "kind": "file",
+    "value": undefined,
+  },
   "stringifyContentPathRegex": undefined,
   "transformers": Array [],
   "tsConfig": Object {

src/config/config-set.spec.ts

@@ -103,6 +103,34 @@ describe('tsJest', () => {
     })
   }) // tsconfig
 
+  describe('packageJson', () => {
+    it('should be correct for default value', () => {
+      const EXPECTED = {
+        kind: 'file',
+        value: undefined,
+      }
+      expect(get().packageJson).toEqual(EXPECTED)
+    })
+
+    it('should be correct for given file', () => {
+      const FILE = 'bar/tsconfig.foo.json'
+      const EXPECTED = {
+        kind: 'file',
+        value: defaultResolve(FILE),
+      }
+      expect(get({ packageJson: FILE }).packageJson).toEqual(EXPECTED)
+    })
+
+    it('should be correct for inline config', () => {
+      const CONFIG = { foo: 'bar' }
+      const EXPECTED = {
+        kind: 'inline',
+        value: CONFIG,
+      }
+      expect(get({ packageJson: CONFIG as any }).packageJson).toEqual(EXPECTED)
+    })
+  }) // packageJson
+
   describe('babelConfig', () => {
     it('should be correct for default value', () => {
       expect(get().babelConfig).toBeUndefined()
@@ -532,7 +560,7 @@ describe('cacheKey', () => {
     cs.jsonValue.value = val
     // digest is mocked in src/__mocks__/index.ts
     expect(cs.cacheKey).toMatchInlineSnapshot(
-      '"{\\"digest\\":\\"a0d51ca854194df8191d0e65c0ca4730f510f332\\",\\"jest\\":{\\"__backported\\":true,\\"globals\\":{}},\\"projectDepVersions\\":{\\"dev\\":\\"1.2.5\\",\\"opt\\":\\"1.2.3\\",\\"peer\\":\\"1.2.4\\",\\"std\\":\\"1.2.6\\"},\\"transformers\\":[\\"hoisting-jest-mock@1\\"],\\"tsJest\\":{\\"compiler\\":\\"typescript\\",\\"diagnostics\\":{\\"ignoreCodes\\":[6059,18002,18003],\\"pretty\\":true,\\"throws\\":true},\\"isolatedModules\\":false,\\"transformers\\":[]},\\"tsconfig\\":{\\"declaration\\":false,\\"inlineSourceMap\\":false,\\"inlineSources\\":true,\\"module\\":1,\\"noEmit\\":false,\\"outDir\\":\\"$$ts-jest$$\\",\\"removeComments\\":false,\\"sourceMap\\":true,\\"target\\":1}}"',
+      '"{\\"digest\\":\\"a0d51ca854194df8191d0e65c0ca4730f510f332\\",\\"jest\\":{\\"__backported\\":true,\\"globals\\":{}},\\"projectDepVersions\\":{\\"dev\\":\\"1.2.5\\",\\"opt\\":\\"1.2.3\\",\\"peer\\":\\"1.2.4\\",\\"std\\":\\"1.2.6\\"},\\"transformers\\":[\\"hoisting-jest-mock@1\\"],\\"tsJest\\":{\\"compiler\\":\\"typescript\\",\\"diagnostics\\":{\\"ignoreCodes\\":[6059,18002,18003],\\"pretty\\":true,\\"throws\\":true},\\"isolatedModules\\":false,\\"packageJson\\":{\\"kind\\":\\"file\\"},\\"transformers\\":[]},\\"tsconfig\\":{\\"declaration\\":false,\\"inlineSourceMap\\":false,\\"inlineSources\\":true,\\"module\\":1,\\"noEmit\\":false,\\"outDir\\":\\"$$ts-jest$$\\",\\"removeComments\\":false,\\"sourceMap\\":true,\\"target\\":1}}"',
     )
   })
 }) // cacheKey
@@ -579,6 +607,10 @@ Object {
       "throws": true,
     },
     "isolatedModules": false,
+    "packageJson": Object {
+      "kind": "file",
+      "value": undefined,
+    },
     "stringifyContentPathRegex": undefined,
     "transformers": Array [],
     "tsConfig": undefined,

src/config/config-set.ts

@@ -114,18 +114,38 @@ const toDiagnosticCodeList = (items: any, into: number[] = []): number[] => {
 export class ConfigSet {
   @Memoize()
   get projectPackageJson(): Record<string, any> {
+    const {
+      tsJest: { packageJson },
+    } = this
+
+    if (packageJson && packageJson.kind === 'inline') {
+      return packageJson.value
+    }
+
+    if (packageJson && packageJson.kind === 'file' && packageJson.value) {
+      const path = this.resolvePath(packageJson.value)
+      if (existsSync(path)) {
+        return require(path)
+      }
+      this.logger.warn(Errors.UnableToFindProjectRoot)
+      return {}
+    }
+
     const tsJestRoot = resolve(__dirname, '..', '..')
     let pkgPath = resolve(tsJestRoot, '..', '..', 'package.json')
-    let exists = existsSync(pkgPath)
-    if (!exists) {
-      if (realpathSync(this.rootDir) === realpathSync(tsJestRoot)) {
-        pkgPath = resolve(tsJestRoot, 'package.json')
-        exists = true
-      } else {
-        this.logger.warn(Errors.UnableToFindProjectRoot)
+    if (existsSync(pkgPath)) {
+      return require(pkgPath)
+    }
+
+    if (realpathSync(this.rootDir) === realpathSync(tsJestRoot)) {
+      pkgPath = resolve(tsJestRoot, 'package.json')
+      if (existsSync(pkgPath)) {
+        return require(pkgPath)
       }
     }
-    return exists ? require(pkgPath) : {}
+
+    this.logger.warn(Errors.UnableToFindProjectRoot)
+    return {}
   }
 
   @Memoize()
@@ -183,6 +203,21 @@ export class ConfigSet {
       }
     }
 
+    // packageJson
+    const { packageJson: packageJsonOpt } = options
+    let packageJson: TsJestConfig['packageJson']
+    if (typeof packageJsonOpt === 'string' || packageJsonOpt == null || packageJsonOpt === true) {
+      packageJson = {
+        kind: 'file',
+        value: typeof packageJsonOpt === 'string' ? this.resolvePath(packageJsonOpt) : undefined,
+      }
+    } else if (typeof packageJsonOpt === 'object') {
+      packageJson = {
+        kind: 'inline',
+        value: packageJsonOpt,
+      }
+    }
+
     // transformers
     const transformers = (options.astTransformers || []).map(mod => this.resolvePath(mod, { nodeResolve: true }))
 
@@ -234,6 +269,7 @@ export class ConfigSet {
     // parsed options
     const res: TsJestConfig = {
       tsConfig,
+      packageJson,
       babelConfig,
       diagnostics,
       isolatedModules: !!options.isolatedModules,

src/types.ts

@@ -21,6 +21,14 @@ export interface TsJestGlobalOptions {
    */
   tsConfig?: boolean | string | CompilerOptions
 
+  /**
+   * packageJson. It can be:
+   *     - `true` (or `undefined`, it's the default): use default package.json file
+   *     - `path/to/package.json`: path to a specific package.json file (<rootDir> can be used)
+   *     - `{...}`: contents of a package.json
+   */
+  packageJson?: boolean | string | object
+
   /**
    * Whether to compile files as isolated modules (disables some features and type-checking, default to `false`):
    */
@@ -93,10 +101,20 @@ interface TsJestConfig$babelConfig$inline {
   value: BabelConfig
 }
 type TsJestConfig$babelConfig = TsJestConfig$babelConfig$file | TsJestConfig$babelConfig$inline | undefined
+interface TsJestConfig$packageJson$file {
+  kind: 'file'
+  value: string | undefined
+}
+interface TsJestConfig$packageJson$inline {
+  kind: 'inline'
+  value: any
+}
+type TsJestConfig$packageJson = TsJestConfig$packageJson$file | TsJestConfig$packageJson$inline | undefined
 type TsJestConfig$stringifyContentPathRegex = string | undefined
 
 export interface TsJestConfig {
   tsConfig: TsJestConfig$tsConfig
+  packageJson: TsJestConfig$packageJson
   isolatedModules: boolean
   compiler: string
   diagnostics: TsJestConfig$diagnostics