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Parcel does not transpile es6 scripts to es5 #9039

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andy-57blocks opened this issue May 26, 2023 · 1 comment
Closed

Parcel does not transpile es6 scripts to es5 #9039

andy-57blocks opened this issue May 26, 2023 · 1 comment

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@andy-57blocks
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馃悰 bug report

Parcel does not transpile es6 scripts to es5

馃帥 Configuration (.babelrc, package.json, cli command)

package.json

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "source": "src/index.html",
  "scripts": {
    "start": "parcel",
    "build": "parcel build --no-source-maps"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.12.0",
    "parcel": "^2.9.0"
  },
  "browserslist": "> 0.001%"
}

src/index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8"/>
    <title>My First Parcel App</title>
    <link rel="stylesheet" href="styles.css" />
    <script type="module" src="app.js"></script>
  </head>
  <body>
    <h1>Hello, World!</h1>
  </body>
</html>

src/app.js

let objA = {
  a: 'aa',
  b: 'bb'
}
let objB = {
  b: 'dd',
  c: 'ee'
}
let result = Object.assign({}, objA, objB)
result.a = 'cc'
console.log(objA, result)

馃 Expected Behavior

When running yarn build, Parcel should transpile Object.assign or add polyfill for it

馃槸 Current Behavior

Code is not transpiled to be compatible with other old browsers
image

dist/index.b6cad3e0.js

!function(){var a={a:"aa",b:"bb"},c=Object.assign({},a,{b:"dd",c:"ee"});c.a="cc",console.log(a,c)}();

馃拋 Possible Solution

馃敠 Context

馃捇 Code Sample

馃實 Your Environment

Software Version(s)
Parcel 2.9.0
Node 18.13.0
npm/Yarn 8.19.3
Operating System mac
@mischnic
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mischnic commented May 26, 2023 •
edited

See #7419 (comment)

For now, install core-js and add import "core-js/modules/es.object.assign.js";

@mischnic mischnic closed this as not planned Won't fix, can't repro, duplicate, stale May 26, 2023
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@mischnic @andy-57blocks