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/* eslint-env jest */
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)
// it should add a React import:
expect(output).toMatch(`import React from"react"`)
// it should hoist JSX factory to a module level variable:
expect(output).toMatch(`var __jsx=React.createElement`)
// it should use that factory for all JSX:
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>;
`)
// Grab generated names from the compiled output.
// It looks something like this:
// var _react = _interopRequireDefault(require("react"));
// var __jsx = _react["default"].createElement;
// react: _react
// reactNamespace: _react["default"]
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`)
// Fragment should use the same React namespace import:
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");};"`
)
})
})
})
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