fix: revert usage of @jest/create-cache-key-function (#2108)

Closes #2080
Closes #2090
Closes #2104

e2e/__tests__/__snapshots__/coverage.test.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`using template "default" should report coverages 1`] = `
+exports[`Code coverage should pass using template "default" 1`] = `
   √ jest
   ↳ exit code: 0
   ===[ STDOUT ]===================================================================
@@ -23,7 +23,7 @@ exports[`using template "default" should report coverages 1`] = `
   ================================================================================
 `;
 
-exports[`using template "with-babel-7" should report coverages 1`] = `
+exports[`Code coverage should pass using template "with-babel-7" 1`] = `
   √ jest
   ↳ exit code: 0
   ===[ STDOUT ]===================================================================
@@ -46,7 +46,7 @@ exports[`using template "with-babel-7" should report coverages 1`] = `
   ================================================================================
 `;
 
-exports[`using template "with-babel-7-string-config" should report coverages 1`] = `
+exports[`Code coverage should pass using template "with-babel-7-string-config" 1`] = `
   √ jest
   ↳ exit code: 0
   ===[ STDOUT ]===================================================================

e2e/__tests__/coverage.test.ts

@@ -1,15 +1,15 @@
 import { allValidPackageSets } from '../__helpers__/templates'
 import { configureTestCase } from '../__helpers__/test-case'
 
-const testCase = configureTestCase('simple', {
-  jestConfig: { collectCoverage: true },
-})
+describe('Code coverage', () => {
+  const testCase = configureTestCase('simple', {
+    jestConfig: { collectCoverage: true },
+  })
 
-testCase.runWithTemplates(allValidPackageSets, 0, (runTest, { templateName }) => {
-  describe(`using template "${templateName}"`, () => {
-    const result = runTest()
+  testCase.runWithTemplates(allValidPackageSets, 0, (runTest, { testLabel }) => {
+    it(testLabel, () => {
+      const result = runTest()
 
-    it(`should report coverages`, () => {
       expect(result.status).toBe(0)
       expect(result).toMatchSnapshot()
     })

package.json

@@ -55,7 +55,6 @@
   },
   "homepage": "https://kulshekhar.github.io/ts-jest",
   "dependencies": {
-    "@jest/create-cache-key-function": "^26.5.0",
     "@types/jest": "26.x",
     "bs-logger": "0.x",
     "buffer-from": "1.x",

src/ts-jest-transformer.spec.ts

@@ -1,4 +1,5 @@
 import { LogLevels } from 'bs-logger'
+import { sep } from 'path'
 
 import { TsJestTransformer } from './ts-jest-transformer'
 import { ConfigSet } from './config/config-set'
@@ -12,39 +13,24 @@ beforeEach(() => {
 })
 
 describe('TsJestTransformer', () => {
-  describe('createOrResolveTransformerCfg', () => {
-    it('should return the same config-set for same values with jest config string is not in cachedConfigSets', () => {
-      const obj1 = { cwd: '/foo/.' } as any
-      const tjT = new TsJestTransformer()
-
-      logTarget.clear()
-
-      tjT.getCacheKey('foo', 'foo', JSON.stringify(obj1), {
-        config: obj1,
-      } as any)
+  describe('configFor', () => {
+    it('should return the same config-set for same values with jest config string is not in configSetsIndex', () => {
+      const obj1 = { cwd: '/foo/.', rootDir: '/bar//dummy/..', globals: {} }
+      const cs3 = new TsJestTransformer().configsFor(obj1 as any)
 
-      expect(logTarget.lines[0]).toMatchInlineSnapshot(`
-        "[level:30] no matching config-set found, creating a new one
-        "
-      `)
+      expect(cs3.cwd).toBe(`${sep}foo`)
+      expect(cs3.rootDir).toBe(`${sep}bar`)
     })
 
-    it('should return the same config-set for same values with jest config string in cachedConfigSets', () => {
+    it('should return the same config-set for same values with jest config string in configSetsIndex', () => {
       const obj1 = { cwd: '/foo/.', rootDir: '/bar//dummy/..', globals: {} }
       const obj2 = { ...obj1 }
-      const tjT1 = new TsJestTransformer()
-      const tjT2 = new TsJestTransformer()
-
-      logTarget.clear()
+      const cs1 = new TsJestTransformer().configsFor(obj1 as any)
+      const cs2 = new TsJestTransformer().configsFor(obj2 as any)
 
-      tjT1.getCacheKey('foo', 'foo', JSON.stringify(obj1), {
-        config: obj1,
-      } as any)
-      tjT2.getCacheKey('foo', 'foo', JSON.stringify(obj2), {
-        config: obj2,
-      } as any)
-
-      expect(logTarget.filteredLines(LogLevels.info)).toHaveLength(1)
+      expect(cs1.cwd).toBe(`${sep}foo`)
+      expect(cs1.rootDir).toBe(`${sep}bar`)
+      expect(cs2).toBe(cs1)
     })
   })
 
@@ -63,10 +49,13 @@ describe('TsJestTransformer', () => {
         tr.getCacheKey(input.fileContent, input.fileName, '{}', { ...input.options, instrument: true }),
         tr.getCacheKey(input.fileContent, input.fileName, '{}', { ...input.options, rootDir: '/bar' }),
       ]
+
       // each key should have correct length
       for (const key of keys) {
-        expect(key).toHaveLength(32)
+        expect(key).toHaveLength(40)
       }
+      // unique array should have same length
+      expect(keys.filter((k, i, all) => all.indexOf(k) === i)).toHaveLength(keys.length)
     })
   })
 

src/ts-jest-transformer.ts

@@ -1,4 +1,3 @@
-import createCacheKey from '@jest/create-cache-key-function'
 import type { CacheKeyOptions, TransformedSource, Transformer, TransformOptions } from '@jest/transform'
 import type { Config } from '@jest/types'
 import type { Logger } from 'bs-logger'
@@ -9,6 +8,7 @@ import { stringify } from './utils/json'
 import { JsonableValue } from './utils/jsonable-value'
 import { rootLogger } from './utils/logger'
 import { Errors, interpolate } from './utils/messages'
+import { sha1 } from './utils/sha1'
 
 interface CachedConfigSet {
   configSet: ConfigSet
@@ -25,14 +25,65 @@ export class TsJestTransformer implements Transformer {
   private static readonly _cachedConfigSets: CachedConfigSet[] = []
   protected readonly logger: Logger
   protected _transformCfgStr!: string
-  protected _configSet!: ConfigSet
 
   constructor() {
     this.logger = rootLogger.child({ namespace: 'ts-jest-transformer' })
 
     this.logger.debug('created new transformer')
   }
 
+  /**
+   * @public
+   */
+  configsFor(jestConfig: Config.ProjectConfig): ConfigSet {
+    const ccs: CachedConfigSet | undefined = TsJestTransformer._cachedConfigSets.find(
+      (cs) => cs.jestConfig.value === jestConfig,
+    )
+    let configSet: ConfigSet
+    if (ccs) {
+      this._transformCfgStr = ccs.transformerCfgStr
+      configSet = ccs.configSet
+    } else {
+      // try to look-it up by stringified version
+      const serializedJestCfg = stringify(jestConfig)
+      const serializedCcs = TsJestTransformer._cachedConfigSets.find(
+        (cs) => cs.jestConfig.serialized === serializedJestCfg,
+      )
+      if (serializedCcs) {
+        // update the object so that we can find it later
+        // this happens because jest first calls getCacheKey with stringified version of
+        // the config, and then it calls the transformer with the proper object
+        serializedCcs.jestConfig.value = jestConfig
+        this._transformCfgStr = serializedCcs.transformerCfgStr
+        configSet = serializedCcs.configSet
+      } else {
+        // create the new record in the index
+        this.logger.info('no matching config-set found, creating a new one')
+
+        configSet = new ConfigSet(jestConfig)
+        this._transformCfgStr = new JsonableValue({
+          digest: configSet.tsJestDigest,
+          babel: configSet.babelConfig,
+          ...jestConfig,
+          tsconfig: {
+            options: configSet.parsedTsConfig.options,
+            raw: configSet.parsedTsConfig.raw,
+          },
+        }).serialized
+        TsJestTransformer._cachedConfigSets.push({
+          jestConfig: new JsonableValue(jestConfig),
+          configSet,
+          transformerCfgStr: this._transformCfgStr,
+        })
+      }
+    }
+
+    return configSet
+  }
+
+  /**
+   * @public
+   */
   process(
     input: string,
     filePath: Config.Path,
@@ -43,9 +94,10 @@ export class TsJestTransformer implements Transformer {
 
     let result: string | TransformedSource
     const source: string = input
-    const { hooks } = this._configSet
-    const shouldStringifyContent = this._configSet.shouldStringifyContent(filePath)
-    const babelJest = shouldStringifyContent ? undefined : this._configSet.babelJestTransformer
+    const configs = this.configsFor(jestConfig)
+    const { hooks } = configs
+    const shouldStringifyContent = configs.shouldStringifyContent(filePath)
+    const babelJest = shouldStringifyContent ? undefined : configs.babelJestTransformer
     const isDefinitionFile = filePath.endsWith(DECLARATION_TYPE_EXT)
     const isJsFile = JS_JSX_REGEX.test(filePath)
     const isTsFile = !isDefinitionFile && TS_TSX_REGEX.test(filePath)
@@ -55,15 +107,15 @@ export class TsJestTransformer implements Transformer {
     } else if (isDefinitionFile) {
       // do not try to compile declaration files
       result = ''
-    } else if (!this._configSet.parsedTsConfig.options.allowJs && isJsFile) {
+    } else if (!configs.parsedTsConfig.options.allowJs && isJsFile) {
       // we've got a '.js' but the compiler option `allowJs` is not set or set to false
       this.logger.warn({ fileName: filePath }, interpolate(Errors.GotJsFileButAllowJsFalse, { path: filePath }))
 
       result = source
     } else if (isJsFile || isTsFile) {
       // transpile TS code (source maps are included)
       /* istanbul ignore if */
-      result = this._configSet.tsCompiler.compile(source, filePath)
+      result = configs.tsCompiler.compile(source, filePath)
     } else {
       // we should not get called for files with other extension than js[x], ts[x] and d.ts,
       // TypeScript will bail if we try to compile, and if it was to call babel, users can
@@ -99,66 +151,32 @@ export class TsJestTransformer implements Transformer {
    * Jest uses this to cache the compiled version of a file
    *
    * @see https://github.com/facebook/jest/blob/v23.5.0/packages/jest-runtime/src/script_transformer.js#L61-L90
+   *
+   * @public
    */
   getCacheKey(
     fileContent: string,
     filePath: string,
     _jestConfigStr: string,
     transformOptions: CacheKeyOptions,
   ): string {
-    this.createOrResolveTransformerCfg(transformOptions.config)
+    const configs = this.configsFor(transformOptions.config)
 
     this.logger.debug({ fileName: filePath, transformOptions }, 'computing cache key for', filePath)
 
-    return createCacheKey()(fileContent, filePath, this._transformCfgStr, {
-      config: transformOptions.config,
-      instrument: false,
-    })
-  }
-
-  /**
-   * Users can override this method and provide their own config class
-   */
-  protected createOrResolveTransformerCfg(jestConfig: Config.ProjectConfig): void {
-    const ccs: CachedConfigSet | undefined = TsJestTransformer._cachedConfigSets.find(
-      (cs) => cs.jestConfig.value === jestConfig,
+    // we do not instrument, ensure it is false all the time
+    const { instrument = false, rootDir = configs.rootDir } = transformOptions
+
+    return sha1(
+      this._transformCfgStr,
+      '\x00',
+      rootDir,
+      '\x00',
+      `instrument:${instrument ? 'on' : 'off'}`,
+      '\x00',
+      fileContent,
+      '\x00',
+      filePath,
     )
-    if (ccs) {
-      this._transformCfgStr = ccs.transformerCfgStr
-      this._configSet = ccs.configSet
-    } else {
-      // try to look-it up by stringified version
-      const serializedJestCfg = stringify(jestConfig)
-      const serializedCcs = TsJestTransformer._cachedConfigSets.find(
-        (cs) => cs.jestConfig.serialized === serializedJestCfg,
-      )
-      if (serializedCcs) {
-        // update the object so that we can find it later
-        // this happens because jest first calls getCacheKey with stringified version of
-        // the config, and then it calls the transformer with the proper object
-        serializedCcs.jestConfig.value = jestConfig
-        this._transformCfgStr = serializedCcs.transformerCfgStr
-        this._configSet = serializedCcs.configSet
-      } else {
-        // create the new record in the index
-        this.logger.info('no matching config-set found, creating a new one')
-
-        this._configSet = new ConfigSet(jestConfig)
-        this._transformCfgStr = new JsonableValue({
-          digest: this._configSet.tsJestDigest,
-          babel: this._configSet.babelConfig,
-          ...jestConfig,
-          tsconfig: {
-            options: this._configSet.parsedTsConfig.options,
-            raw: this._configSet.parsedTsConfig.raw,
-          },
-        }).serialized
-        TsJestTransformer._cachedConfigSets.push({
-          jestConfig: new JsonableValue(jestConfig),
-          configSet: this._configSet,
-          transformerCfgStr: this._transformCfgStr,
-        })
-      }
-    }
   }
 }