feat(config): show a warning message when TypeScript target version…

… doesn't match with recommended NodeJs version (#1678)

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

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`TS_JEST_LOG should pass and create log file when using template "default" 1`] = `
+exports[`ts-jest logging TS_JEST_LOG should pass and create log file when using template "default" 1`] = `
 Array [
   "[level:20] creating jest presets not handling JavaScript files",
   "[level:20] creating Importer singleton",
@@ -37,7 +37,7 @@ Array [
 ]
 `;
 
-exports[`TS_JEST_LOG should pass and create log file when using template "with-babel-7" 1`] = `
+exports[`ts-jest logging TS_JEST_LOG should pass and create log file when using template "with-babel-7" 1`] = `
 Array [
   "[level:20] creating jest presets not handling JavaScript files",
   "[level:20] creating Importer singleton",
@@ -80,7 +80,7 @@ Array [
 ]
 `;
 
-exports[`TS_JEST_LOG should pass and create log file when using template "with-babel-7-string-config" 1`] = `
+exports[`ts-jest logging TS_JEST_LOG should pass and create log file when using template "with-babel-7-string-config" 1`] = `
 Array [
   "[level:20] creating jest presets not handling JavaScript files",
   "[level:20] creating Importer singleton",
@@ -124,7 +124,7 @@ Array [
 ]
 `;
 
-exports[`With unsupported version test should pass using template "with-unsupported-version" 1`] = `
+exports[`ts-jest logging with unsupported version test should pass using template "with-unsupported-version" 1`] = `
   √ jest
   ↳ exit code: 0
   ===[ STDOUT ]===================================================================
@@ -142,3 +142,10 @@ exports[`With unsupported version test should pass using template "with-unsuppor
   Ran all test suites.
   ================================================================================
 `;
+
+exports[`ts-jest logging typescript target is higher than es2019 for NodeJs 12 should pass using template "default" 1`] = `
+Array [
+  "[level:40] There is a mismatch between your NodeJs version v12.16.3 and your TypeScript target es2020. This might lead to some unexpected errors when running tests with \`ts-jest\`. To fix this, you can check https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping",
+  "[level:40] message TS151001: If you have issues related to imports, you should consider setting \`esModuleInterop\` to \`true\` in your TypeScript configuration file (usually \`tsconfig.json\`). See https://blogs.msdn.microsoft.com/typescript/2018/01/31/announcing-typescript-2-7/#easier-ecmascript-module-interoperability for more information.",
+]
+`;

e2e/__tests__/logger.test.ts

@@ -4,35 +4,68 @@ import { existsSync } from 'fs'
 import { PackageSets, allValidPackageSets } from '../__helpers__/templates'
 import { configureTestCase } from '../__helpers__/test-case'
 
-describe('With unsupported version test', () => {
-  const testCase = configureTestCase('simple')
+describe('ts-jest logging', () => {
+  describe('with unsupported version test', () => {
+    const testCase = configureTestCase('simple')
 
-  testCase.runWithTemplates([PackageSets.unsupportedVersion], 0, (runTest, { testLabel }) => {
-    it(testLabel, () => {
-      const result = runTest()
-      expect(result.status).toBe(0)
-      expect(result).toMatchSnapshot()
+    testCase.runWithTemplates([PackageSets.unsupportedVersion], 0, (runTest, { testLabel }) => {
+      it(testLabel, () => {
+        const result = runTest()
+        expect(result.status).toBe(0)
+        expect(result).toMatchSnapshot()
+      })
     })
   })
-})
 
-describe('TS_JEST_LOG', () => {
-  const testCase = configureTestCase('simple', {
-    env: { TS_JEST_LOG: 'ts-jest.log' },
-    noCache: true,
-  })
+  describe('TS_JEST_LOG', () => {
+    const testCase = configureTestCase('simple', {
+      env: { TS_JEST_LOG: 'ts-jest.log' },
+      noCache: true,
+    })
 
-  testCase.runWithTemplates(allValidPackageSets, 0, (runTest, { templateName }) => {
-    it(`should pass and create log file when using template "${templateName}"`, () => {
-      const result = runTest()
-      expect(result.status).toBe(0)
-      expect(existsSync(result.logFilePath)).toBe(true)
-      const filteredEntries = result.logFileEntries
-        // keep only debug and above
-        .filter(m => (m.context[LogContexts.logLevel] || 0) >= LogLevels.debug)
-        // simplify entires
-        .map(e => result.normalize(`[level:${e.context[LogContexts.logLevel]}] ${e.message}`))
-      expect(filteredEntries).toMatchSnapshot()
+    testCase.runWithTemplates(allValidPackageSets, 0, (runTest, { templateName }) => {
+      it(`should pass and create log file when using template "${templateName}"`, () => {
+        const result = runTest()
+        expect(result.status).toBe(0)
+        expect(existsSync(result.logFilePath)).toBe(true)
+        const filteredEntries = result.logFileEntries
+          // keep only debug and above
+          .filter(m => (m.context[LogContexts.logLevel] || 0) >= LogLevels.debug)
+          // simplify entires
+          .map(e => result.normalize(`[level:${e.context[LogContexts.logLevel]}] ${e.message}`))
+        expect(filteredEntries).toMatchSnapshot()
+      })
     })
   })
+
+  /**
+   * Since we only run e2e for node 12 so we need this if here. We follow latest LTS Node version so once latest LTS version
+   * changes, we also need to change this test.
+   */
+  if (process.version.startsWith('v12')) {
+    describe('typescript target is higher than es2019 for NodeJs 12', () => {
+      const testCase = configureTestCase('simple', {
+        env: { TS_JEST_LOG: 'ts-jest.log' },
+        noCache: true,
+        tsJestConfig: {
+          tsConfig: {
+            target: 'es2020'
+          }
+        }
+      })
+
+      testCase.runWithTemplates([PackageSets.default], 0, (runTest, { testLabel }) => {
+        it(testLabel, () => {
+          const result = runTest()
+          expect(result.status).toBe(0)
+          const filteredEntries = result.logFileEntries
+            // keep only debug and above
+            .filter(m => (m.context[LogContexts.logLevel] || 0) === LogLevels.warn)
+            // simplify entires
+            .map(e => result.normalize(`[level:${e.context[LogContexts.logLevel]}] ${e.message}`))
+          expect(filteredEntries).toMatchSnapshot()
+        })
+      })
+    })
+  }
 })

e2e/jest.config.js

@@ -1,11 +1,10 @@
+const jestBaseConfig = require('../jest-base')
+
+/** @type {import('@jest/types').Config.InitialOptions} */
 module.exports = {
+  ...jestBaseConfig,
   rootDir: '..',
-  transform: {
-    '\\.ts$': '<rootDir>/dist/index.js',
-  },
   testMatch: ['<rootDir>/e2e/__tests__/**/*.test.ts'],
-  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
-  testEnvironment: 'node',
   snapshotSerializers: [
     '<rootDir>/e2e/__serializers__/run-result.ts',
     '<rootDir>/e2e/__serializers__/processed-source.ts',

jest-base.js

@@ -0,0 +1,12 @@
+/** @type {import('@jest/types').Config.InitialOptions} */
+module.exports = {
+  globals: {
+    'ts-jest': {
+      tsConfig: 'tsconfig.spec.json',
+    },
+  },
+  transform: {
+    '\\.ts$': '<rootDir>/dist/index.js',
+  },
+  testEnvironment: 'node',
+}

jest.config.js

@@ -1,9 +1,10 @@
+const baseConfig = require('./jest-base')
+
+/** @type {import('@jest/types').Config.InitialOptions} */
 module.exports = {
+  ...baseConfig,
   rootDir: '.',
   setupFilesAfterEnv: ['<rootDir>/src/__helpers__/setup.ts'],
-  transform: {
-    '\\.ts$': '<rootDir>/dist/index.js',
-  },
   testMatch: ['<rootDir>/src/**/*.spec.ts'],
   testPathIgnorePatterns: ['<rootDir>/src/__mocks__/*'],
   collectCoverageFrom: [
@@ -14,8 +15,6 @@ module.exports = {
     '!<rootDir>/src/**/__*__/*',
     '!<rootDir>/src/util/testing.ts',
   ],
-  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
-  testEnvironment: 'node',
   snapshotSerializers: ['<rootDir>/src/__serializers__/processed-source.ts'],
   cacheDirectory: '<rootDir>/.cache/unit',
 }

src/config/config-set.spec.ts

@@ -1,7 +1,7 @@
 /* eslint-disable jest/no-mocks-import */
 import { Transformer } from '@jest/transform'
 import { Config } from '@jest/types'
-import { testing } from 'bs-logger'
+import { LogLevels, testing } from 'bs-logger'
 import { readFileSync } from 'fs'
 import json5 = require('json5')
 import { resolve } from 'path'
@@ -792,6 +792,59 @@ describe('readTsConfig', () => {
       })
     })
   })
+
+  describe('mismatch nodejs version and typescript target', () => {
+    const logTarget = logTargetMock()
+
+    beforeEach(() => {
+      logTarget.clear()
+      cs = createConfigSet({ jestConfig: { rootDir: '/root', cwd: '/cwd' } as any })
+      findConfig.mockImplementation((p) => `${p}/tsconfig.json`)
+    })
+
+    afterEach(() => {
+      findConfig.mockClear()
+    })
+
+    function mismatchTestCaseContent(tsTarget: string, scriptTarget: ts.ScriptTarget) {
+      parseConfig.mockImplementation((conf: any) => ({
+        options: {
+          ...conf,
+          target: scriptTarget,
+        },
+        fileNames: [],
+        errors: [],
+      }))
+      readConfig.mockImplementation((p) => ({ config: { path: p, compilerOptions: { target: tsTarget } } }))
+
+      cs.readTsConfig()
+
+      // expect.toEqual gives weird result here so toContain is workaround for it.
+      expect(logTarget.filteredLines(LogLevels.warn, Infinity)[0]).toContain(
+        '[level:40] There is a mismatch between your ' +
+          `NodeJs version ${process.version} and your TypeScript target ${tsTarget}. This might lead to some unexpected errors ` +
+          'when running tests with `ts-jest`. To fix this, you can check https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping',
+      )
+
+      parseConfig.mockClear()
+      readConfig.mockClear()
+    }
+
+    /**
+     * It seems like not possible to mock process.version so the condition here is needed
+     */
+    if (process.version.startsWith('v10')) {
+      // eslint-disable-next-line jest/expect-expect
+      it('should show warning message when nodejs version is 10 and typescript target is higher than es2018', () => {
+        mismatchTestCaseContent('es2019', ts.ScriptTarget.ES2019)
+      })
+    } else {
+      // eslint-disable-next-line jest/expect-expect
+      it('should show warning message when nodejs version is 12 and typescript target is higher than es2019', () => {
+        mismatchTestCaseContent('es2020', ts.ScriptTarget.ES2020)
+      })
+    }
+  })
 }) // readTsConfig
 
 describe('versions', () => {

src/config/config-set.ts

@@ -20,6 +20,7 @@ import {
   DiagnosticCategory,
   FormatDiagnosticsHost,
   ParsedCommandLine,
+  ScriptTarget,
   SourceFile,
 } from 'typescript'
 
@@ -31,11 +32,11 @@ import {
   AstTransformerDesc,
   BabelConfig,
   BabelJestTransformer,
-  TTypeScript,
   TsCompiler,
   TsJestConfig,
   TsJestGlobalOptions,
   TsJestHooksMap,
+  TTypeScript,
 } from '../types'
 import { backportJestConfig } from '../util/backports'
 import { getPackageVersion } from '../util/get-package-version'
@@ -723,7 +724,7 @@ export class ConfigSet {
     resolvedConfigFile?: string | null,
     noProject?: boolean | null,
   ): ParsedCommandLine {
-    let config = { compilerOptions: {} }
+    let config = { compilerOptions: Object.create(null) }
     let basePath = normalizeSlashes(this.rootDir)
     let configFileName: string | undefined
     const ts = this.compilerModule
@@ -800,6 +801,22 @@ export class ConfigSet {
         finalOptions[key] = val
       }
     }
+    /**
+     * See https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping
+     * Every time this page is updated, we also need to update here. Here we only show warning message for Node LTS versions
+     */
+    const nodeJsVer = process.version
+    const compilationTarget = result.options.target!
+    if (
+      (nodeJsVer.startsWith('v10') && compilationTarget > ScriptTarget.ES2018) ||
+      (nodeJsVer.startsWith('v12') && compilationTarget > ScriptTarget.ES2019)
+    ) {
+      const message = interpolate(Errors.MismatchNodeTargetMapping, {
+        nodeJsVer: process.version,
+        compilationTarget: config.compilerOptions.target,
+      })
+      logger.warn(message)
+    }
 
     return result
   }

src/util/messages.ts

@@ -18,6 +18,7 @@ export const enum Errors {
   GotUnknownFileTypeWithBabel = 'Got a unknown file type to compile (file: {{path}}). To fix this, in your Jest config change the `transform` key which value is `ts-jest` so that it does not match this kind of files anymore. If you still want Babel to process it, add another entry to the `transform` option with value `babel-jest` which key matches this type of files.',
   ConfigNoModuleInterop = 'If you have issues related to imports, you should consider setting `esModuleInterop` to `true` in your TypeScript configuration file (usually `tsconfig.json`). See https://blogs.msdn.microsoft.com/typescript/2018/01/31/announcing-typescript-2-7/#easier-ecmascript-module-interoperability for more information.',
   UnableToFindProjectRoot = 'Unable to find the root of the project where ts-jest has been installed.',
+  MismatchNodeTargetMapping = 'There is a mismatch between your NodeJs version {{nodeJsVer}} and your TypeScript target {{compilationTarget}}. This might lead to some unexpected errors when running tests with `ts-jest`. To fix this, you can check https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping',
 }
 
 /**

src/util/version-checkers.ts

@@ -9,7 +9,7 @@ const logger = rootLogger.child({ namespace: 'versions' })
 /**
  * @internal
  */
-export const enum ExpectedVersions {
+const enum ExpectedVersions {
   Jest = '>=26 <27',
   TypeScript = '>=3.8 <4',
   BabelJest = '>=26 <27',
@@ -49,6 +49,7 @@ function checkVersion(
 ): boolean | never {
   const version = getPackageVersion(name)
   const success = !!version && satisfies(version, expectedRange)
+
   logger.debug(
     {
       actualVersion: version,
@@ -58,6 +59,7 @@ function checkVersion(
     name,
     success ? 'OK' : 'NOT OK',
   )
+
   if (!action || success) return success
 
   const message = interpolate(version ? Errors.UntestedDependencyVersion : Errors.MissingDependency, {

tsconfig.json

@@ -30,15 +30,5 @@
       "node",
       "react"
     ]
-  },
-  "include": [
-    "e2e/__helpers__",
-    "e2e/__serializers__",
-    "e2e/__tests__",
-    "scripts/",
-    "src/",
-    "utils/",
-    "presets",
-    "./*.js"
-  ]
+  }
 }

tsconfig.spec.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": []
+}