feat: make injectImports & injectRootOptions work for .vue files

packages/@vue/cli/__tests__/Generator.spec.js

@@ -23,6 +23,19 @@ new Vue({
 }).$mount('#app')
 `.trim())
 fs.writeFileSync(path.resolve(templateDir, 'empty-entry.js'), `;`)
+fs.writeFileSync(path.resolve(templateDir, 'hello.vue'), `
+<template>
+  <p>Hello, {{ msg }}</p>
+</template>
+<script>
+export default {
+  name: 'HelloWorld',
+  props: {
+    msg: String
+  }
+}
+</script>
+`)
 
 // replace stubs
 fs.writeFileSync(path.resolve(templateDir, 'replace.js'), `
@@ -505,6 +518,25 @@ test('api: addEntryDuplicateImport', async () => {
   expect(fs.readFileSync('/main.js', 'utf-8')).toMatch(/^import foo from 'foo'\s+new Vue/)
 })
 
+test('api: injectImport for .vue files', async () => {
+  const generator = new Generator('/', { plugins: [
+    {
+      id: 'test',
+      apply: api => {
+        api.injectImports('hello.vue', `import foo from 'foo'`)
+        api.render({
+          'hello.vue': path.join(templateDir, 'hello.vue')
+        })
+      }
+    }
+  ] })
+
+  await generator.generate()
+  const content = fs.readFileSync('/hello.vue', 'utf-8')
+  expect(content).toMatch(/import foo from 'foo'/)
+  expect(content).toMatch(/<template>([\s\S]*)<\/template>/)
+})
+
 test('api: addEntryDuplicateInjection', async () => {
   const generator = new Generator('/', { plugins: [
     {

packages/@vue/cli/lib/Generator.js

@@ -5,7 +5,7 @@ const sortObject = require('./util/sortObject')
 const writeFileTree = require('./util/writeFileTree')
 const inferRootOptions = require('./util/inferRootOptions')
 const normalizeFilePaths = require('./util/normalizeFilePaths')
-const injectImportsAndOptions = require('./util/injectImportsAndOptions')
+const runCodemod = require('./util/runCodemod')
 const { toShortPluginId, matchesPluginId } = require('@vue/cli-shared-utils')
 const ConfigTransform = require('./ConfigTransform')
 
@@ -215,11 +215,25 @@ module.exports = class Generator {
 
     // handle imports and root option injections
     Object.keys(files).forEach(file => {
-      files[file] = injectImportsAndOptions(
-        files[file],
-        this.imports[file],
-        this.rootOptions[file]
-      )
+      let imports = this.imports[file]
+      imports = imports instanceof Set ? Array.from(imports) : imports
+      if (imports && imports.length > 0) {
+        files[file] = runCodemod(
+          require('./util/codemods/injectImports'),
+          { path: file, source: files[file] },
+          { imports }
+        )
+      }
+
+      let injections = this.rootOptions[file]
+      injections = injections instanceof Set ? Array.from(injections) : injections
+      if (injections && injections.length > 0) {
+        files[file] = runCodemod(
+          require('./util/codemods/injectOptions'),
+          { path: file, source: files[file] },
+          { injections }
+        )
+      }
     })
 
     for (const postProcess of this.postProcessFilesCbs) {

packages/@vue/cli/lib/util/codemods/injectImports.js

@@ -0,0 +1,29 @@
+module.exports = function injectImports (fileInfo, api, { imports }) {
+  const j = api.jscodeshift
+  const root = j(fileInfo.source)
+
+  const toImportAST = i => j(`${i}\n`).nodes()[0].program.body[0]
+  const toImportHash = node => JSON.stringify({
+    specifiers: node.specifiers.map(s => s.local.name),
+    source: node.source.raw
+  })
+
+  const declarations = root.find(j.ImportDeclaration)
+  const importSet = new Set(declarations.nodes().map(toImportHash))
+  const nonDuplicates = node => !importSet.has(toImportHash(node))
+
+  const importASTNodes = imports.map(toImportAST).filter(nonDuplicates)
+
+  if (declarations.length) {
+    declarations
+      .at(-1)
+      // a tricky way to avoid blank line after the previous import
+      .forEach(({ node }) => delete node.loc)
+      .insertAfter(importASTNodes)
+  } else {
+    // no pre-existing import declarations
+    root.get().node.program.body.unshift(...importASTNodes)
+  }
+
+  return root.toSource()
+}

packages/@vue/cli/lib/util/codemods/injectOptions.js

@@ -0,0 +1,27 @@
+module.exports = function injectOptions (fileInfo, api, { injections }) {
+  const j = api.jscodeshift
+  const root = j(fileInfo.source)
+
+  const toPropertyAST = i => {
+    return j(`({${i}})`).nodes()[0].program.body[0].expression.properties[0]
+  }
+
+  const properties = root
+    .find(j.NewExpression, {
+      callee: { name: 'Vue' },
+      arguments: [{ type: 'ObjectExpression' }]
+    })
+    .map(path => path.get('arguments', 0))
+    .get()
+    .node
+    .properties
+
+  const toPropertyHash = p => `${p.key.name}: ${j(p.value).toSource()}`
+  const propertySet = new Set(properties.map(toPropertyHash))
+  const nonDuplicates = p => !propertySet.has(toPropertyHash(p))
+
+  // inject at index length - 1 as it's usually the render fn
+  properties.splice(-1, 0, ...injections.map(toPropertyAST).filter(nonDuplicates))
+
+  return root.toSource()
+}

packages/@vue/cli/lib/util/runCodemod.js

@@ -0,0 +1,6 @@
+const jscodeshift = require('jscodeshift')
+const adapt = require('vue-jscodeshift-adapter')
+
+module.exports = function runCodemod (transform, fileInfo, options) {
+  return adapt(transform)(fileInfo, { jscodeshift }, options || {})
+}

packages/@vue/cli/package.json

@@ -56,6 +56,7 @@
     "shortid": "^2.2.11",
     "slash": "^3.0.0",
     "validate-npm-package-name": "^3.0.0",
+    "vue-jscodeshift-adapter": "2.0.2",
     "yaml-front-matter": "^3.4.1"
   },
   "engines": {