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feat(core): faster HTML minimizer - `siteConfig.future.experimental_f…
…aster.swcHtmlMinimizer` (#10554)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
|
|
||
| import logger from '@docusaurus/logger'; | ||
| import {minify as terserHtmlMinifier} from 'html-minifier-terser'; | ||
| import {importSwcHtmlMinifier} from './importFaster'; | ||
| import type {DocusaurusConfig} from '@docusaurus/types'; | ||
|
|
||
| // Historical env variable | ||
| const SkipHtmlMinification = process.env.SKIP_HTML_MINIFICATION === 'true'; | ||
|
|
||
| export type HtmlMinifier = { | ||
| minify: (html: string) => Promise<string>; | ||
| }; | ||
|
|
||
| const NoopMinifier: HtmlMinifier = { | ||
| minify: async (html: string) => html, | ||
| }; | ||
|
|
||
| type SiteConfigSlice = { | ||
| future: { | ||
| experimental_faster: Pick< | ||
| DocusaurusConfig['future']['experimental_faster'], | ||
| 'swcHtmlMinimizer' | ||
| >; | ||
| }; | ||
| }; | ||
|
|
||
| export async function getHtmlMinifier({ | ||
| siteConfig, | ||
| }: { | ||
| siteConfig: SiteConfigSlice; | ||
| }): Promise<HtmlMinifier> { | ||
| if (SkipHtmlMinification) { | ||
| return NoopMinifier; | ||
| } | ||
| if (siteConfig.future.experimental_faster.swcHtmlMinimizer) { | ||
| return getSwcMinifier(); | ||
| } else { | ||
| return getTerserMinifier(); | ||
| } | ||
| } | ||
|
|
||
| // Minify html with https://github.com/DanielRuf/html-minifier-terser | ||
| async function getTerserMinifier(): Promise<HtmlMinifier> { | ||
| return { | ||
| minify: async function minifyHtmlWithTerser(html) { | ||
| try { | ||
| return await terserHtmlMinifier(html, { | ||
| removeComments: false, | ||
| removeRedundantAttributes: true, | ||
| removeEmptyAttributes: true, | ||
| removeScriptTypeAttributes: true, | ||
| removeStyleLinkTypeAttributes: true, | ||
| useShortDoctype: true, | ||
| minifyJS: true, | ||
| }); | ||
| } catch (err) { | ||
| throw new Error(`HTML minification failed (Terser)`, { | ||
| cause: err as Error, | ||
| }); | ||
| } | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| // Minify html with @swc/html | ||
| // Not well-documented but fast! | ||
| // See https://github.com/swc-project/swc/discussions/9616 | ||
| async function getSwcMinifier(): Promise<HtmlMinifier> { | ||
| const swcHtmlMinifier = await importSwcHtmlMinifier(); | ||
| return { | ||
| minify: async function minifyHtmlWithSwc(html) { | ||
| try { | ||
| const result = await swcHtmlMinifier(Buffer.from(html), { | ||
| // Removing comments can lead to React hydration errors | ||
| // See https://x.com/sebastienlorber/status/1841966927440478577 | ||
| removeComments: false, | ||
| // TODO maybe it's fine to only keep <!-- --> React comments? | ||
| preserveComments: [], | ||
|
|
||
| // Sorting these attributes (class) can lead to React hydration errors | ||
| sortSpaceSeparatedAttributeValues: false, | ||
| sortAttributes: false, | ||
|
|
||
| // @ts-expect-error: bad type https://github.com/swc-project/swc/pull/9615 | ||
| removeRedundantAttributes: 'all', | ||
| removeEmptyAttributes: true, | ||
| minifyJs: true, | ||
| minifyJson: true, | ||
| minifyCss: true, | ||
| }); | ||
|
|
||
| // Escape hatch because SWC is quite aggressive to report errors | ||
| // TODO figure out what to do with these errors: throw or swallow? | ||
| // See https://github.com/facebook/docusaurus/pull/10554 | ||
| // See https://github.com/swc-project/swc/discussions/9616#discussioncomment-10846201 | ||
| const ignoreSwcMinifierErrors = | ||
| process.env.DOCUSAURUS_IGNORE_SWC_HTML_MINIFIER_ERRORS === 'true'; | ||
| if (!ignoreSwcMinifierErrors && result.errors) { | ||
| const ignoredErrors: string[] = [ | ||
| // TODO Docusaurus seems to emit NULL chars, and minifier detects it | ||
| // see https://github.com/facebook/docusaurus/issues/9985 | ||
| 'Unexpected null character', | ||
| ]; | ||
| result.errors = result.errors.filter( | ||
| (diagnostic) => !ignoredErrors.includes(diagnostic.message), | ||
| ); | ||
| if (result.errors.length) { | ||
| throw new Error( | ||
| `HTML minification diagnostic errors: | ||
| - ${result.errors | ||
| .map( | ||
| (diagnostic) => | ||
| `[${diagnostic.level}] ${ | ||
| diagnostic.message | ||
| } - ${JSON.stringify(diagnostic.span)}`, | ||
| ) | ||
| .join('\n- ')} | ||
| Note: please report the problem to the Docusaurus team | ||
| In the meantime, you can skip this error with ${logger.code( | ||
| 'DOCUSAURUS_IGNORE_SWC_HTML_MINIFIER_ERRORS=true', | ||
| )}`, | ||
| ); | ||
| } | ||
| /* | ||
| if (result.errors.length) { | ||
| throw new AggregateError( | ||
| result.errors.map( | ||
| (diagnostic) => new Error(JSON.stringify(diagnostic, null, 2)), | ||
| ), | ||
| ); | ||
| } | ||
| */ | ||
| } | ||
| return result.code; | ||
| } catch (err) { | ||
| throw new Error(`HTML minification failed (SWC)`, { | ||
| cause: err as Error, | ||
| }); | ||
| } | ||
| }, | ||
| }; | ||
| } |
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