fix(tsconfig): parse extended tsconfigs when transpiling script blocks

A change introduced in v28.1.0 in PR vuejs#471 unintentionally changed the behavior of the tsconfig parsing such that configs using "extends" were no longer being considered.

Fixes: vuejs#495

Author: Adam Hines

e2e/2.x/basic/components/ExtendedTsConfig.vue

@@ -0,0 +1,34 @@
+<template>
+  <div>
+    {{ exclamationMarks }}
+    <type-script-child />
+  </div>
+</template>
+
+<script lang="ts">
+import TypeScriptChild from './TypeScriptChild.vue'
+
+import moduleRequiringEsModuleInterop from './ModuleRequiringEsModuleInterop'
+
+// The default import above relies on esModuleInterop being set to true in order to use it from
+// an import statement instead of require. This option is configured in the tsconfig.base.json,
+// so if we are no longer fully processing the tsconfig options (extended from a base config)
+// this test should fail. This was one of the only reliable ways I could get a test to fail if
+// these conditions are not being met and happen to be the use-case which was triggering errors
+// in my config setup.
+
+if (moduleRequiringEsModuleInterop()) {
+  console.log('Should never hit this')
+}
+
+export default {
+  computed: {
+    exclamationMarks(): string {
+      return 'string'
+    }
+  },
+  components: {
+    TypeScriptChild
+  }
+}
+</script>

e2e/2.x/basic/components/ModuleRequiringEsModuleInterop.js

@@ -0,0 +1 @@
+module.exports = () => false

e2e/2.x/basic/test.js

@@ -21,6 +21,8 @@ import Jsx from './components/Jsx.vue'
 import Constructor from './components/Constructor.vue'
 import { compileStyle } from '@vue/component-compiler-utils'
 import ScriptSetup from './components/ScriptSetup'
+import ExtendedTsConfig from './components/ExtendedTsConfig.vue'
+
 jest.mock('@vue/component-compiler-utils', () => ({
   ...jest.requireActual('@vue/component-compiler-utils'),
   compileStyle: jest.fn(() => ({ errors: [], code: '' }))
@@ -163,6 +165,11 @@ test('processes SFC with <script setup>', () => {
   expect(wrapper.html()).toContain('Welcome to Your Vue.js App')
 })
 
+test('handles extended tsconfig.json files', () => {
+  const wrapper = mount(ExtendedTsConfig)
+  expect(wrapper.element.tagName).toBe('DIV')
+})
+
 test('should pass properly "styleOptions" into "preprocessOptions"', () => {
   const filePath = resolve(__dirname, './components/Basic.vue')
   const fileString = readFileSync(filePath, { encoding: 'utf8' })

e2e/2.x/basic/tsconfig.base.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["dom", "es6"],
+    "module": "es2015",
+    "moduleResolution": "node",
+    "types": ["vue-typescript-import-dts", "node"],
+    "isolatedModules": false,
+    "experimentalDecorators": true,
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictNullChecks": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "suppressImplicitAnyIndexErrors": true,
+    "allowSyntheticDefaultImports": true,
+    "sourceMap": true,
+    "esModuleInterop": true,
+    "allowJs": true
+  }
+}

e2e/2.x/basic/tsconfig.json

@@ -1,20 +1,3 @@
 {
-  "compilerOptions": {
-    "target": "es5",
-    "lib": ["dom", "es6"],
-    "module": "es2015",
-    "moduleResolution": "node",
-    "types": ["vue-typescript-import-dts", "node"],
-    "isolatedModules": false,
-    "experimentalDecorators": true,
-    "noImplicitAny": true,
-    "noImplicitThis": true,
-    "strictNullChecks": true,
-    "removeComments": true,
-    "emitDecoratorMetadata": true,
-    "suppressImplicitAnyIndexErrors": true,
-    "allowSyntheticDefaultImports": true,
-    "sourceMap": true,
-    "allowJs": true
-  }
+  "extends": "./tsconfig.base.json"
 }

e2e/3.x/basic/components/ExtendedTsConfig.vue

@@ -0,0 +1,34 @@
+<template>
+  <div>
+    {{ exclamationMarks }}
+    <type-script-child />
+  </div>
+</template>
+
+<script lang="ts">
+import TypeScriptChild from './TypeScriptChild.vue'
+
+import moduleRequiringEsModuleInterop from './ModuleRequiringEsModuleInterop'
+
+// The default import above relies on esModuleInterop being set to true in order to use it from
+// an import statement instead of require. This option is configured in the tsconfig.base.json,
+// so if we are no longer fully processing the tsconfig options (extended from a base config)
+// this test should fail. This was one of the only reliable ways I could get a test to fail if
+// these conditions are not being met and happen to be the use-case which was triggering errors
+// in my config setup.
+
+if (moduleRequiringEsModuleInterop()) {
+  console.log('Should never hit this')
+}
+
+export default {
+  computed: {
+    exclamationMarks(): string {
+      return 'string'
+    }
+  },
+  components: {
+    TypeScriptChild
+  }
+}
+</script>

e2e/3.x/basic/components/ModuleRequiringEsModuleInterop.js

@@ -0,0 +1 @@
+module.exports = () => false

e2e/3.x/basic/test.js

@@ -23,6 +23,7 @@ import ScriptSetup from './components/ScriptSetup.vue'
 import ScriptSetupSugarRef from './components/ScriptSetupSugarRef.vue'
 import FunctionalRenderFn from './components/FunctionalRenderFn.vue'
 import CompilerDirective from './components/CompilerDirective.vue'
+import ExtendedTsConfig from './components/ExtendedTsConfig.vue'
 
 // TODO: JSX for Vue 3? TSX?
 import Jsx from './components/Jsx.vue'
@@ -207,3 +208,9 @@ test('ensure compilerOptions is passed down', () => {
   const elm = document.querySelector('h1')
   expect(elm.hasAttribute('data-test')).toBe(false)
 })
+
+test('handles extended tsconfig.json files', () => {
+  mount(ExtendedTsConfig)
+  const elm = document.querySelector('div')
+  expect(elm).toBeDefined()
+})

e2e/3.x/basic/tsconfig.base.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["dom", "es6"],
+    "module": "es2015",
+    "moduleResolution": "node",
+    "types": ["vue-typescript-import-dts", "node"],
+    "isolatedModules": false,
+    "experimentalDecorators": true,
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictNullChecks": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "suppressImplicitAnyIndexErrors": true,
+    "allowSyntheticDefaultImports": true,
+    "sourceMap": true,
+    "esModuleInterop": true,
+    "allowJs": true
+  }
+}

e2e/3.x/basic/tsconfig.json

@@ -1,20 +1,3 @@
 {
-  "compilerOptions": {
-    "target": "es5",
-    "lib": ["dom", "es6"],
-    "module": "es2015",
-    "moduleResolution": "node",
-    "types": ["vue-typescript-import-dts", "node"],
-    "isolatedModules": false,
-    "experimentalDecorators": true,
-    "noImplicitAny": true,
-    "noImplicitThis": true,
-    "strictNullChecks": true,
-    "removeComments": true,
-    "emitDecoratorMetadata": true,
-    "suppressImplicitAnyIndexErrors": true,
-    "allowSyntheticDefaultImports": true,
-    "sourceMap": true,
-    "allowJs": true
-  }
+  "extends": "./tsconfig.base.json"
 }

packages/vue2-jest/lib/ensure-require.js

@@ -1,4 +1,4 @@
-const throwError = require('./utils').throwError
+const throwError = require('./throw-error')
 
 module.exports = function(name, deps) {
   let i, len

packages/vue2-jest/lib/throw-error.js

@@ -0,0 +1,3 @@
+module.exports = function throwError(msg) {
+  throw new Error('\n[vue-jest] Error: ' + msg + '\n')
+}

packages/vue2-jest/lib/utils.js

@@ -1,6 +1,8 @@
+const ensureRequire = require('./ensure-require')
+const throwError = require('./throw-error')
 const constants = require('./constants')
 const loadPartialConfig = require('@babel/core').loadPartialConfig
-const { loadSync: loadTsConfigSync } = require('tsconfig')
+const { resolveSync: resolveTsConfigSync } = require('tsconfig')
 const chalk = require('chalk')
 const path = require('path')
 const fs = require('fs')
@@ -74,16 +76,38 @@ const getBabelOptions = function loadBabelOptions(filename, options = {}) {
  * @returns {import('typescript').TranspileOptions | null} TypeScript compilerOptions or null
  */
 const getTypeScriptConfig = function getTypeScriptConfig(path) {
-  const tsconfig = loadTsConfigSync(process.cwd(), path || '')
-  if (!tsconfig.path) {
+  ensureRequire('typescript', ['typescript'])
+  const typescript = require('typescript')
+
+  const tsconfigPath = resolveTsConfigSync(process.cwd(), path || '')
+  if (!tsconfigPath) {
     warn(`Not found tsconfig.json.`)
     return null
   }
-  const compilerOptions =
-    (tsconfig.config && tsconfig.config.compilerOptions) || {}
+
+  const parsedConfig = typescript.getParsedCommandLineOfConfigFile(
+    tsconfigPath,
+    {},
+    {
+      ...typescript.sys,
+      onUnRecoverableConfigFileDiagnostic: e => {
+        const errorMessage = typescript.formatDiagnostic(e, {
+          getCurrentDirectory: () => process.cwd(),
+          getNewLine: () => `\n`,
+          getCanonicalFileName: file => file.replace(/\\/g, '/')
+        })
+        warn(errorMessage)
+      }
+    }
+  )
+
+  const compilerOptions = parsedConfig ? parsedConfig.options : {}
 
   return {
-    compilerOptions: { ...compilerOptions, module: 'commonjs' }
+    compilerOptions: {
+      ...compilerOptions,
+      module: typescript.ModuleKind.CommonJS
+    }
   }
 }
 
@@ -131,10 +155,6 @@ const getCustomTransformer = function getCustomTransformer(
     : transformer
 }
 
-const throwError = function error(msg) {
-  throw new Error('\n[vue-jest] Error: ' + msg + '\n')
-}
-
 const stripInlineSourceMap = function(str) {
   return str.slice(0, str.indexOf('//# sourceMappingURL'))
 }

packages/vue3-jest/lib/ensure-require.js

@@ -1,4 +1,4 @@
-const throwError = require('./utils').throwError
+const throwError = require('./throw-error')
 
 module.exports = function(name, deps) {
   let i, len

packages/vue3-jest/lib/process.js

@@ -129,7 +129,9 @@ function processTemplate(descriptor, filename, config) {
     const tsconfig = getTypeScriptConfig(vueJestConfig.tsConfig)
     if (tsconfig) {
       const { transpileModule } = require('typescript')
-      const { outputText } = transpileModule(result.code, { tsconfig })
+      const { outputText } = transpileModule(result.code, {
+        tsconfig
+      })
       return { code: outputText }
     }
   }

packages/vue3-jest/lib/throw-error.js

@@ -0,0 +1,3 @@
+module.exports = function throwError(msg) {
+  throw new Error('\n[vue-jest] Error: ' + msg + '\n')
+}

packages/vue3-jest/lib/utils.js

@@ -1,6 +1,8 @@
+const ensureRequire = require('./ensure-require')
+const throwError = require('./throw-error')
 const constants = require('./constants')
 const loadPartialConfig = require('@babel/core').loadPartialConfig
-const { loadSync: loadTsConfigSync } = require('tsconfig')
+const { resolveSync: resolveTsConfigSync } = require('tsconfig')
 const chalk = require('chalk')
 const path = require('path')
 const fs = require('fs')
@@ -74,17 +76,40 @@ const getBabelOptions = function loadBabelOptions(filename, options = {}) {
  * @returns {import('typescript').TranspileOptions | null} TypeScript compilerOptions or null
  */
 const getTypeScriptConfig = function getTypeScriptConfig(path) {
-  const tsconfig = loadTsConfigSync(process.cwd(), path || '')
-  if (!tsconfig.path) {
+  ensureRequire('typescript', ['typescript'])
+  const typescript = require('typescript')
+
+  const tsconfigPath = resolveTsConfigSync(process.cwd(), path || '')
+  if (!tsconfigPath) {
     warn(`Not found tsconfig.json.`)
     return null
   }
-  const compilerOptions =
-    (tsconfig.config && tsconfig.config.compilerOptions) || {}
+
+  const parsedConfig = typescript.getParsedCommandLineOfConfigFile(
+    tsconfigPath,
+    {},
+    {
+      ...typescript.sys,
+      onUnRecoverableConfigFileDiagnostic: e => {
+        const errorMessage = typescript.formatDiagnostic(e, {
+          getCurrentDirectory: () => process.cwd(),
+          getNewLine: () => `\n`,
+          getCanonicalFileName: file => file.replace(/\\/g, '/')
+        })
+        warn(errorMessage)
+      }
+    }
+  )
+
+  const compilerOptions = parsedConfig ? parsedConfig.options : {}
 
   // Force es5 to prevent const vue_1 = require('vue') from conflicting
   return {
-    compilerOptions: { ...compilerOptions, target: 'es5', module: 'commonjs' }
+    compilerOptions: {
+      ...compilerOptions,
+      target: typescript.ScriptTarget.ES5,
+      module: typescript.ModuleKind.CommonJS
+    }
   }
 }
 
@@ -133,10 +158,6 @@ const getCustomTransformer = function getCustomTransformer(
     : transformer
 }
 
-const throwError = function error(msg) {
-  throw new Error('\n[vue-jest] Error: ' + msg + '\n')
-}
-
 const stripInlineSourceMap = function(str) {
   return str.slice(0, str.indexOf('//# sourceMappingURL'))
 }