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next.js/packages/next/build/webpack/loaders/next-babel-loader.js
Tim Neutkens f01457e8fc
Take full advantage of caching between builds (#5597)
Takes advantage of caching between builds for Terser, also makes writing caches for babel-loader faster by disabling compression.

Results for zeit.co (350 pages):

Without cache:
[4:16:22 PM] Compiled server in 1m
[4:16:57 PM] Compiled client in 2m
  Done in 125.83s.

With cache:
[4:19:38 PM] Compiled client in 17s
[4:19:50 PM] Compiled server in 29s
  Done in 31.79s.

Note: these results are from my multi-core Macbook Pro 2017, exact specs:
MacBook Pro (13-inch, 2017, Four Thunderbolt 3 Ports)
- 3,3 GHz Intel Core i5
- 16 GB 2133 MHz LPDDR3
- Intel Iris Plus Graphics 650 1536 MB

The `without cache` build runs uglify in parallel, so without cache is likely to take longer on environments where you have only 1 core available.

The `with cache` build however runs in a single thread, so the results should be similar.
2018-11-05 17:51:56 +01:00

43 lines
1.2 KiB
JavaScript

import babelLoader from 'babel-loader'
module.exports = babelLoader.custom(babel => {
const presetItem = babel.createConfigItem(require('../../babel/preset'), {type: 'preset'})
const configs = new Set()
return {
customOptions (opts) {
const custom = {
isServer: opts.isServer,
dev: opts.dev
}
const loader = Object.assign({
cacheCompression: false,
cacheDirectory: true
}, opts)
delete loader.isServer
delete loader.dev
return { loader, custom }
},
config (cfg, {customOptions: {isServer, dev}}) {
const options = Object.assign({}, cfg.options)
if (cfg.hasFilesystemConfig()) {
for (const file of [cfg.babelrc, cfg.config]) {
// We only log for client compilation otherwise there will be double output
if (file && !isServer && !configs.has(file)) {
configs.add(file)
console.log(`> Using external babel configuration`)
console.log(`> Location: "${file}"`)
}
}
} else {
// Add our default preset if the no "babelrc" found.
options.presets = [...options.presets, presetItem]
}
return options
}
}
})