| |
| import { transformSync } from '@babel/core' |
|
|
| const trim = (s) => s.join('\n').trim().replace(/^\s+/gm, '') |
|
|
| const babel = (code, esm = false, presetOptions = {}, filename = 'noop.js') => |
| transformSync(code, { |
| filename, |
| presets: [[require('next/dist/build/babel/preset'), presetOptions]], |
| babelrc: false, |
| configFile: false, |
| sourceType: 'module', |
| compact: true, |
| caller: { |
| name: 'tests', |
| supportsStaticESM: esm, |
| isDev: false, |
| }, |
| } as any).code |
|
|
| describe('next/babel', () => { |
| describe('jsx-pragma', () => { |
| it('should transform JSX to use a local identifier in modern mode', () => { |
| const output = babel(`const a = () => <a href="/">home</a>;`, true) |
|
|
| |
| expect(output).toMatch(`import React from"react"`) |
| |
| expect(output).toMatch(`var __jsx=React.createElement`) |
| |
| expect(output).toMatch(`__jsx("a",{href:"/"`) |
|
|
| expect( |
| babel(`const a = ()=><a href="/">home</a>`, true) |
| ).toMatchInlineSnapshot( |
| `"import React from"react";var __jsx=React.createElement;var a=function a(){return __jsx("a",{href:"/"},"home");};"` |
| ) |
| }) |
|
|
| it('should transform JSX to use a local identifier in CommonJS mode', () => { |
| const output = babel(trim` |
| const a = () => <React.Fragment><a href="/">home</a></React.Fragment>; |
| `) |
|
|
| |
| |
| |
| |
| |
| |
| const [, react, reactNamespace] = output.match( |
| /(([a-z0-9_]+)(\[[^\]]*?\]|\.[a-z0-9_]+)*?)\.Fragment/i |
| ) |
|
|
| expect(output).toMatch(`var ${reactNamespace}=`) |
| expect(output).toMatch(`require("react")`) |
| expect(output).toMatch(`var __jsx=${react}.createElement`) |
| |
| expect(output).toMatch(`__jsx(${react}.Fragment`) |
| expect(output).toMatch(`__jsx("a",{href:"/"`) |
|
|
| expect(babel(`const a = ()=><a href="/">home</a>`)).toMatchInlineSnapshot( |
| `""use strict";var _interopRequireDefault=require("@babel/runtime/helpers/interopRequireDefault");var _react=_interopRequireDefault(require("react"));var __jsx=_react["default"].createElement;var a=function a(){return __jsx("a",{href:"/"},"home");};"` |
| ) |
| }) |
|
|
| it('should support Fragment syntax', () => { |
| const output = babel(`const a = () => <>hello</>;`, true) |
|
|
| expect(output).toMatch(`React.Fragment`) |
|
|
| expect(babel(`const a = () => <>hello</>;`, true)).toMatchInlineSnapshot( |
| `"import React from"react";var __jsx=React.createElement;var a=function a(){return __jsx(React.Fragment,null,"hello");};"` |
| ) |
| }) |
|
|
| it('should support commonjs', () => { |
| const output = babel( |
| trim` |
| const React = require('react'); |
| module.exports = () => <div>test2</div>; |
| `, |
| true |
| ) |
|
|
| expect(output).toMatchInlineSnapshot( |
| `"var React=require('react');var __jsx=React.createElement;module.exports=function(){return __jsx("div",null,"test2");};"` |
| ) |
| }) |
| }) |
|
|
| describe('optimize-hook-destructuring', () => { |
| it('should transform Array-destructured hook return values use object destructuring', () => { |
| const output = babel( |
| trim` |
| import { useState } from 'react'; |
| const [count, setCount] = useState(0); |
| `, |
| true |
| ) |
|
|
| expect(output).toMatch(trim` |
| var _useState=useState(0),count=_useState[0],setCount=_useState[1]; |
| `) |
|
|
| expect(output).toMatchInlineSnapshot( |
| `"import{useState}from'react';var _useState=useState(0),count=_useState[0],setCount=_useState[1];"` |
| ) |
| }) |
|
|
| it('should be able to ignore some Array-destructured hook return values', () => { |
| const output = babel( |
| trim` |
| import { useState } from 'react'; |
| const [, setCount] = useState(0); |
| `, |
| true |
| ) |
|
|
| expect(output).toMatch(trim` |
| var _useState=useState(0),setCount=_useState[1]; |
| `) |
|
|
| expect(output).toMatchInlineSnapshot( |
| `"import{useState}from'react';var _useState=useState(0),setCount=_useState[1];"` |
| ) |
| }) |
| }) |
|
|
| describe('@babel/preset-typescript', () => { |
| describe('should allow passing options', () => { |
| const code = trim` |
| import { Tesla } from "./tesla"; |
| import { Car } from "./car"; |
| |
| const benediktsDreamCar: Car = new Tesla(); |
| ` |
|
|
| function compileMyCar(options) { |
| return babel( |
| code, |
| false, |
| { |
| 'preset-typescript': options, |
| }, |
| 'my-car.ts' |
| ) |
| } |
|
|
| describe('when setting { onlyRemoveTypeImports: true }', () => { |
| it('should not elide import', () => { |
| const output = compileMyCar({ onlyRemoveTypeImports: true }) |
|
|
| expect(output).toContain('require("./car")') |
| }) |
| }) |
|
|
| describe('when setting { onlyRemoveTypeImports: false }', () => { |
| it('should elide import', () => { |
| const output = compileMyCar({ onlyRemoveTypeImports: false }) |
|
|
| expect(output).not.toContain('require("./car")') |
| }) |
| }) |
| }) |
| }) |
|
|
| describe('respect preset-react runtime', () => { |
| it('should allow forcing on automatic mode', () => { |
| const code = trim`const a = ()=><a href="/">home</a>` |
| const output = babel(code, true, { |
| 'preset-react': { |
| runtime: 'automatic', |
| }, |
| }) |
|
|
| expect(output).toMatchInlineSnapshot( |
| `"import{jsx as _jsx}from"react/jsx-runtime";var a=function a(){return/*#__PURE__*/_jsx("a",{href:"/",children:"home"});};"` |
| ) |
| }) |
|
|
| it('should allow forcing on classic mode', () => { |
| const code = trim`const a = ()=><a href="/">home</a>` |
| const output = babel(code, true, { |
| 'preset-react': { |
| runtime: 'classic', |
| }, |
| }) |
|
|
| expect(output).toMatchInlineSnapshot( |
| `"import React from"react";var __jsx=React.createElement;var a=function a(){return __jsx("a",{href:"/"},"home");};"` |
| ) |
| }) |
| }) |
| }) |
|
|
