embark/babel.config.js
Michael Bradley, Jr 3f61e314d9 build: implement a common babel config
Setup a `babel.config.js` in the root of the monorepo to be used by
`packages/*`. It won't be used by some packages, e.g. `packages/embark-ui`, but
most of them should use it instead of rolling their own.

Allow for package-level modifications by specifying `babelrcRoots` in the root
`babel.config.js`

Use the babel `--root-mode upward` option in `packages/embark`'s `build`
script. Other packages intending to use the common config should do likewise.

Use a `.babelrc.js` in `packages/embark` to supply the package-specific
`ignore` settings.

Make packages used by the common config devDeps of the root.

Extract babel-related devDeps from `packages/embark`, but don't extract the
non-dev deps since those are used by embark's pipeline in a production
install. Normally, it should only be necessary to have `@babel/cli` and
`@babel/core` in devDeps, and possibly `@babel/runtime-corejs2` in deps, plus
any package-specific babel-related dev/deps. Once we deprecate the pipeline, we
can finish the extraction.

Use `ncu -f '/babel/' -u` to bump the versions of all babel-related deps in the
root and in `packages/embark`. We get better space/time savings from the yarn
workspace when versions match.
2019-02-06 11:34:47 -05:00

64 lines
1.4 KiB
JavaScript

/* global module require */
const cloneDeep = require('lodash.clonedeep');
module.exports = (api) => {
const env = api.env();
const base = {
babelrcRoots: [
'.',
'packages/*',
],
plugins: [
'babel-plugin-macros',
['@babel/plugin-proposal-decorators', {
legacy: true
}],
'@babel/plugin-syntax-dynamic-import',
['@babel/plugin-proposal-class-properties', {
loose: true
}],
'@babel/plugin-proposal-optional-chaining',
['@babel/plugin-transform-runtime', {
corejs: 2
}]
],
presets: [
'@babel/preset-env',
'@babel/preset-typescript'
]
};
if (env === 'base' || env.startsWith('base:')) {
return base;
}
const browser = cloneDeep(base);
browser.plugins[browser.plugins.length - 1][1].useESModules = true;
browser.presets[0] = [browser.presets[0], {
modules: false,
targets: {browsers: ['last 1 version', 'not dead', '> 0.2%']}
}];
if (env === 'browser' || env.startsWith('browser:')) {
return browser;
}
const node = cloneDeep(base);
node.plugins.splice(
node.plugins.indexOf('@babel/plugin-syntax-dynamic-import') + 1,
0,
'babel-plugin-dynamic-import-node'
);
node.presets[0] = [node.presets[0], {
targets: {node: '8.11.3'}
}];
if (env === 'node' || env.startsWith('node:')) {
return node;
}
return {};
};