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startup performance improvements (vercel#24129)
* import next-server logic during the time the configuration is loaded * load minimizer plugins only when used * load ReactDevOverlay only when used * load only meta information of tsconfig for validation * make worker for configuration loading lighter * only load runTypeCheck when used * load postcss config only when used
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101 changes: 101 additions & 0 deletions
101
packages/next/next-server/server/config-utils-worker.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| import { loadEnvConfig } from '@next/env' | ||
| import findUp from 'next/dist/compiled/find-up' | ||
| import { init as initWebpack } from 'next/dist/compiled/webpack/webpack' | ||
| import { CONFIG_FILE, PHASE_DEVELOPMENT_SERVER } from '../lib/constants' | ||
| import { NextConfig, normalizeConfig } from './config-shared' | ||
| import * as Log from '../../build/output/log' | ||
|
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| let installed: boolean = false | ||
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| export function install(useWebpack5: boolean) { | ||
| if (installed) { | ||
| return | ||
| } | ||
| installed = true | ||
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| initWebpack(useWebpack5) | ||
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| // hook the Node.js require so that webpack requires are | ||
| // routed to the bundled and now initialized webpack version | ||
| require('../../build/webpack/require-hook') | ||
| } | ||
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| export type CheckReasons = | ||
| | 'test-mode' | ||
| | 'no-config' | ||
| | 'future-flag' | ||
| | 'no-future-flag' | ||
| | 'no-webpack-config' | ||
| | 'webpack-config' | ||
|
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| export type CheckResult = { | ||
| enabled: boolean | ||
| reason: CheckReasons | ||
| } | ||
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| export async function shouldLoadWithWebpack5( | ||
| phase: string, | ||
| dir: string | ||
| ): Promise<CheckResult> { | ||
| await loadEnvConfig(dir, phase === PHASE_DEVELOPMENT_SERVER, Log) | ||
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| const path = await findUp(CONFIG_FILE, { | ||
| cwd: dir, | ||
| }) | ||
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| if (Number(process.env.NEXT_PRIVATE_TEST_WEBPACK5_MODE) > 0) { | ||
| return { | ||
| enabled: true, | ||
| reason: 'test-mode', | ||
| } | ||
| } | ||
|
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| // No `next.config.js`: | ||
| if (!path?.length) { | ||
| // Uncomment to add auto-enable when there is no next.config.js | ||
| // Use webpack 5 by default in new apps: | ||
| return { | ||
| enabled: true, | ||
| reason: 'no-config', | ||
| } | ||
| } | ||
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| // Default to webpack 4 for backwards compatibility on boot: | ||
| install(false) | ||
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| const userConfigModule = require(path) | ||
| const userConfig: Partial<NextConfig> = normalizeConfig( | ||
| phase, | ||
| userConfigModule.default || userConfigModule | ||
| ) | ||
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| // Opted-in manually | ||
| if (userConfig.future?.webpack5 === true) { | ||
| return { | ||
| enabled: true, | ||
| reason: 'future-flag', | ||
| } | ||
| } | ||
|
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| // Opted-out manually | ||
| if (userConfig.future?.webpack5 === false) { | ||
| return { | ||
| enabled: false, | ||
| reason: 'no-future-flag', | ||
| } | ||
| } | ||
|
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| // Uncomment to add auto-enable when there is no custom webpack config | ||
| // The user isn't configuring webpack | ||
| if (!userConfig.webpack) { | ||
| return { | ||
| enabled: true, | ||
| reason: 'no-webpack-config', | ||
| } | ||
| } | ||
|
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| return { | ||
| enabled: false, | ||
| reason: 'webpack-config', | ||
| } | ||
| } |
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