[@babel/preset-env] Provides broken warnings on compile with useBuiltIns #9751
Description
Bug Report
Current Behavior
WARNING: We noticed you're using the `useBuiltIns` option without declaring a core-js version. Currently, we assume version 2.x when no version is passed. Since this default version will likely change in future versions of Babel, we recommend explicitly setting the core-js version you are using via the `corejs` option.
You should also be sure that the version you pass to the `corejs` option matches the version specified in your `package.json`'s `dependencies` section. If it doesn't, you need to run one of the following commands:
npm install --save core-js@2 npm install --save core-js@3
yarn add core-js@2 yarn add core-js@3
When using useBuiltIns it is giving this warning. So I changed and used core-js 3.0.0 since it seemed like that was an option based on it saying i could run that.
I added corejs to the config stating 3.0.0, but then it just errors and no longer works:
Error: Cannot find module 'core-js/modules/es7.symbol.async-iterator'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
at Function.Module._load (internal/modules/cjs/loader.js:507:25)
at Module.require (internal/modules/cjs/loader.js:637:17)
at require (internal/modules/cjs/helpers.js:22:18)
at Object.<anonymous> (/Users/Shared/Development/projects/idex-server-v2/node_modules/@auroradao/logger/dist/constants.js:9:1)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Module._compile (/Users/Shared/Development/projects/idex-server-v2/node_modules/pirates/lib/index.js:99:24)
at Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Object.newLoader [as .js] (/Users/Shared/Development/projects/idex-server-v2/node_modules/pirates/lib/index.js:104:7)
at Module.load (internal/modules/cjs/loader.js:599:32)
Note that installing and using corejs 2 does work - so this is just reporting about the fact its confusing it seems to indicate support of 3.0.0 when it doesnt have it
Expected behavior/code
be more clear that i should not use core-js@3 if it is not supported / remove that entire set of yarn commands to not confuse people.
Babel Configuration (.babelrc, package.json, cli command)
module.exports = function getBabelConfiguration(api) {
api.cache.never();
return {
presets: [
[
'@babel/preset-env',
{
useBuiltIns: 'usage',
corejs: '3.0.0',
shippedProposals: true,
targets: {
node: '10.15',
},
},
],
],
plugins: [
[
'module-resolver',
{
root: ['./src/shared'],
},
],
'@babel/plugin-transform-flow-strip-types',
'@babel/proposal-class-properties',
'@babel/proposal-optional-chaining',
'dynamic-import-node',
'lodash',
],
};
};Environment
- Babel version(s): [e.g. v6.0.0, v7.0.0-beta.34] See below
- Node/npm version: [e.g. Node 8/npm 5] Node 10.15
- OS: [e.g. OSX 10.13.4, Windows 10] OSX
- Monorepo: [e.g. yes/no/Lerna] no
"@babel/cli": "^7.2.3",
"@babel/core": "^7.4.0",
"@babel/node": "^7.2.2",
"@babel/plugin-proposal-class-properties": "^7.4.0",
"@babel/plugin-proposal-optional-chaining": "^7.2.0",
"@babel/preset-env": "^7.4.2",
"@babel/preset-flow": "^7.0.0",