feat:Add support for useDefineForClassFields typescript option

packages/next/build/swc/options.js

@@ -40,6 +40,9 @@ function getBaseSWCOptions({
   const emitDecoratorMetadata = Boolean(
     jsConfig?.compilerOptions?.emitDecoratorMetadata
   )
+  const useDefineForClassFields = Boolean(
+    jsConfig?.compilerOptions?.useDefineForClassFields
+  )
   return {
     jsc: {
       ...(resolvedBaseUrl && paths
@@ -63,6 +66,7 @@ function getBaseSWCOptions({
           : {}),
         legacyDecorator: enableDecorators,
         decoratorMetadata: emitDecoratorMetadata,
+        useDefineForClassFields: useDefineForClassFields,
         react: {
           importSource:
             jsConfig?.compilerOptions?.jsxImportSource ??

test/development/basic/define-class-fields.test.ts

@@ -0,0 +1,90 @@
+import { join } from 'path'
+import webdriver from 'next-webdriver'
+import { createNext, FileRef } from 'e2e-utils'
+import { NextInstance } from 'test/lib/next-modes/base'
+import { check } from 'next-test-utils'
+
+describe('useDefineForClassFields SWC option', () => {
+  let next: NextInstance
+
+  beforeAll(async () => {
+    next = await createNext({
+      files: {
+        'tsconfig.json': new FileRef(
+          join(__dirname, 'define-class-fields/tsconfig.json')
+        ),
+        pages: new FileRef(join(__dirname, 'define-class-fields/pages')),
+      },
+      dependencies: {
+        mobx: '6.3.7',
+        typescript: '*',
+        '@types/react': '*',
+        '@types/node': '*',
+        'mobx-react': '7.2.1',
+      },
+    })
+  })
+
+  afterAll(() => next.destroy())
+
+  it('tsx should compile with useDefineForClassFields enabled', async () => {
+    let browser
+    try {
+      browser = await webdriver(next.appPort, '/')
+      await browser.elementByCss('#action').click()
+      await check(
+        () => browser.elementByCss('#name').text(),
+        /this is my name: next/
+      )
+    } finally {
+      if (browser) {
+        await browser.close()
+      }
+    }
+  })
+
+  it("Initializes resident to undefined after the call to 'super()' when with useDefineForClassFields enabled", async () => {
+    let browser
+    try {
+      browser = await webdriver(next.appPort, '/animal')
+      expect(await browser.elementByCss('#dog').text()).toBe('')
+      expect(await browser.elementByCss('#dogDecl').text()).toBe('dog')
+    } finally {
+      if (browser) {
+        await browser.close()
+      }
+    }
+  })
+
+  async function matchLogs$(browser) {
+    let data_foundLog = false
+    let name_foundLog = false
+
+    const browserLogs = await browser.log('browser')
+
+    browserLogs.forEach((log) => {
+      if (log.message.includes('data changed')) {
+        data_foundLog = true
+      }
+      if (log.message.includes('name changed')) {
+        name_foundLog = true
+      }
+    })
+    return [data_foundLog, name_foundLog]
+  }
+
+  it('set accessors from base classes won’t get triggered with useDefineForClassFields enabled', async () => {
+    let browser
+    try {
+      browser = await webdriver(next.appPort, '/derived')
+      await matchLogs$(browser).then(([data_foundLog, name_foundLog]) => {
+        expect(data_foundLog).toBe(true)
+        expect(name_foundLog).toBe(false)
+      })
+    } finally {
+      if (browser) {
+        await browser.close()
+      }
+    }
+  })
+})

test/development/basic/define-class-fields/pages/animal.tsx

@@ -0,0 +1,53 @@
+import React from 'react'
+
+interface Animal {
+  animalStuff: any
+}
+interface Dog extends Animal {
+  dogStuff: any
+}
+
+class AnimalHouse {
+  resident: Animal
+  constructor(animal: Animal) {
+    this.resident = animal
+  }
+}
+class DogHouse extends AnimalHouse {
+  // Initializes 'resident' to 'undefined'
+  // after the call to 'super()' when
+  // using 'useDefineForClassFields'!
+  // @ts-ignore
+  resident: Dog
+  // useless constructor only for type checker
+  /* eslint-disable @typescript-eslint/no-useless-constructor */
+  constructor(dog: Dog) {
+    super(dog)
+  }
+}
+
+class DogHouseWithDeclare extends AnimalHouse {
+  declare resident: Dog
+  // useless constructor only for type checker
+  /* eslint-disable @typescript-eslint/no-useless-constructor */
+  constructor(dog: Dog) {
+    super(dog)
+  }
+}
+
+export default function AnimalView() {
+  const dog = new DogHouse({
+    animalStuff: 'animal',
+    dogStuff: 'dog',
+  })
+  const dogDeclare = new DogHouseWithDeclare({
+    animalStuff: 'animal',
+    dogStuff: 'dog',
+  })
+  return (
+    <>
+      <div id={'dog'}>{dog.resident}</div>
+      <div id={'dogDecl'}>{dogDeclare.resident?.dogStuff}</div>
+    </>
+  )
+}

test/development/basic/define-class-fields/pages/derived.tsx

@@ -0,0 +1,33 @@
+import React from 'react'
+
+class Base {
+  set data(value: number) {
+    console.log('data changed to ' + value)
+  }
+
+  set name(value: number) {
+    console.log('name changed to ' + value)
+  }
+}
+
+class Derived extends Base {
+  // No longer triggers a 'console.log'
+  // when using 'useDefineForClassFields'.
+  // @ts-ignore
+  name = 10
+  constructor() {
+    super()
+    //triggers a 'console.log'
+    this.data = 10
+  }
+}
+
+export default function DerivedView() {
+  const obj = new Derived()
+  return (
+    <>
+      <div id={'data'}>{obj.data}</div>
+      <div id={'name'}>{obj.name}</div>
+    </>
+  )
+}

test/development/basic/define-class-fields/pages/index.tsx

@@ -0,0 +1,39 @@
+// @ts-ignore
+import { makeObservable, observable } from 'mobx'
+// @ts-ignore
+import { observer } from 'mobx-react'
+import React from 'react'
+
+class Person {
+  //Declarations are initialized with Object.defineProperty.
+
+  // @ts-ignore
+  name: string
+
+  constructor() {
+    //without useDefineForClassFields it will be error
+    makeObservable(this, {
+      name: observable,
+    })
+  }
+}
+
+const person = new Person()
+
+const PersonView = observer(() => {
+  const changeName = () => {
+    person.name = 'next'
+  }
+  return (
+    <>
+      <div id="name">this is my name: {person.name}</div>
+      <button id="action" onClick={changeName}>
+        Change Name
+      </button>
+    </>
+  )
+})
+
+export default function Home() {
+  return <PersonView />
+}

test/development/basic/define-class-fields/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "useDefineForClassFields": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "jsx": "preserve",
+    "target": "es5",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": false,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "incremental": true,
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true
+  }
+}