feat(v2): broken links detection

packages/docusaurus-init/templates/bootstrap/docs/doc1.md

@@ -63,8 +63,6 @@ Strikethrough uses two tildes. ~~Scratch this.~~
 
 [I'm a reference-style link][arbitrary case-insensitive reference text]
 
-[I'm a relative reference to a repository file](../blob/master/LICENSE)
-
 [You can use numbers for reference-style link definitions][1]
 
 Or leave it empty and use the [link text itself].

packages/docusaurus-init/templates/bootstrap/docusaurus.config.js

@@ -3,6 +3,7 @@ module.exports = {
   tagline: 'The tagline of my site',
   url: 'https://your-docusaurus-test-site.com',
   baseUrl: '/',
+  onBrokenLinks: 'throw',
   favicon: 'img/favicon.ico',
   organizationName: 'facebook', // Usually your GitHub org/user name.
   projectName: 'docusaurus', // Usually your repo name.

packages/docusaurus-init/templates/classic/docs/doc1.md

@@ -63,8 +63,6 @@ Strikethrough uses two tildes. ~~Scratch this.~~
 
 [I'm a reference-style link][arbitrary case-insensitive reference text]
 
-[I'm a relative reference to a repository file](../blob/master/LICENSE)
-
 [You can use numbers for reference-style link definitions][1]
 
 Or leave it empty and use the [link text itself].

packages/docusaurus-init/templates/classic/docusaurus.config.js

@@ -3,6 +3,7 @@ module.exports = {
   tagline: 'The tagline of my site',
   url: 'https://your-docusaurus-test-site.com',
   baseUrl: '/',
+  onBrokenLinks: 'throw',
   favicon: 'img/favicon.ico',
   organizationName: 'facebook', // Usually your GitHub org/user name.
   projectName: 'docusaurus', // Usually your repo name.

packages/docusaurus-init/templates/facebook/docs/doc1.md

@@ -63,8 +63,6 @@ Strikethrough uses two tildes. ~~Scratch this.~~
 
 [I'm a reference-style link][arbitrary case-insensitive reference text]
 
-[I'm a relative reference to a repository file](../blob/master/LICENSE)
-
 [You can use numbers for reference-style link definitions][1]
 
 Or leave it empty and use the [link text itself].

packages/docusaurus-init/templates/facebook/docusaurus.config.js

@@ -12,6 +12,7 @@ module.exports = {
   tagline: 'The tagline of my site',
   url: 'https://your-docusaurus-test-site.com',
   baseUrl: '/',
+  onBrokenLinks: 'throw',
   favicon: 'img/favicon.ico',
   organizationName: 'facebook', // Usually your GitHub org/user name.
   projectName: 'docusaurus', // Usually your repo name.

packages/docusaurus-types/src/index.d.ts

@@ -10,12 +10,15 @@ import {Command} from 'commander';
 import {ParsedUrlQueryInput} from 'querystring';
 import {MergeStrategy} from 'webpack-merge';
 
+export type OnBrokenLinks = 'ignore' | 'log' | 'error' | 'throw';
+
 export interface DocusaurusConfig {
   baseUrl: string;
   favicon: string;
   tagline?: string;
   title: string;
   url: string;
+  onBrokenLinks: OnBrokenLinks;
   organizationName?: string;
   projectName?: string;
   githubHost?: string;
@@ -111,6 +114,7 @@ export interface InjectedHtmlTags {
 export type HtmlTags = string | HtmlTagObject | (string | HtmlTagObject)[];
 
 export interface Props extends LoadContext, InjectedHtmlTags {
+  routes: RouteConfig[];
   routesPaths: string[];
   plugins: Plugin<any, unknown>[];
 }

packages/docusaurus/package.json

@@ -73,6 +73,7 @@
     "import-fresh": "^3.2.1",
     "inquirer": "^7.2.0",
     "is-root": "^2.1.0",
+    "lodash": "^4.5.2",
     "lodash.has": "^4.5.2",
     "lodash.isplainobject": "^4.0.6",
     "lodash.isstring": "^4.0.1",
@@ -90,6 +91,7 @@
     "react-router": "^5.1.2",
     "react-router-config": "^5.1.1",
     "react-router-dom": "^5.1.2",
+    "resolve-pathname": "^3.0.0",
     "semver": "^6.3.0",
     "serve-handler": "^6.1.3",
     "shelljs": "^0.8.4",

packages/docusaurus/src/client/LinksCollector.tsx

@@ -0,0 +1,50 @@
+/**
+ * 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 React, {ReactNode, useContext, createContext} from 'react';
+
+type LinksCollector = {
+  collectLink: (link: string) => void;
+};
+
+type StatefulLinksCollector = LinksCollector & {
+  getCollectedLinks: () => string[];
+};
+
+export const createStatefulLinksCollector = (): StatefulLinksCollector => {
+  // Set to dedup, as it's not useful to collect multiple times the same link
+  const allLinks = new Set<string>();
+  return {
+    collectLink: (link: string): void => {
+      allLinks.add(link);
+    },
+    getCollectedLinks: (): string[] => {
+      return [...allLinks];
+    },
+  };
+};
+
+const Context = createContext<LinksCollector>({
+  collectLink: () => {
+    // noop by default for client
+    // we only use the broken links checker server-side
+  },
+});
+
+export const useLinksCollector = () => {
+  return useContext(Context);
+};
+
+export const ProvideLinksCollector = ({
+  children,
+  linksCollector,
+}: {
+  children: ReactNode;
+  linksCollector: LinksCollector;
+}) => {
+  return <Context.Provider value={linksCollector}>{children}</Context.Provider>;
+};

packages/docusaurus/src/client/exports/Link.tsx

@@ -10,6 +10,7 @@ import React, {ReactNode, useEffect, useRef} from 'react';
 import {NavLink, Link as RRLink} from 'react-router-dom';
 import isInternalUrl from './isInternalUrl';
 import ExecutionEnvironment from './ExecutionEnvironment';
+import {useLinksCollector} from '../LinksCollector';
 
 declare global {
   interface Window {
@@ -26,6 +27,7 @@ interface Props {
 }
 
 function Link({isNavLink, activeClassName, ...props}: Props): JSX.Element {
+  const linksCollector = useLinksCollector();
   const {to, href} = props;
   const targetLink = to || href;
   const isInternal = isInternalUrl(targetLink);
@@ -84,7 +86,14 @@ function Link({isNavLink, activeClassName, ...props}: Props): JSX.Element {
     };
   }, [targetLink, IOSupported, isInternal]);
 
-  return !targetLink || !isInternal || targetLink.startsWith('#') ? (
+  const isAnchorLink = targetLink?.startsWith('#') ?? false;
+  const isRegularHtmlLink = !targetLink || !isInternal || isAnchorLink;
+
+  if (isInternal && !isAnchorLink) {
+    linksCollector.collectLink(targetLink);
+  }
+
+  return isRegularHtmlLink ? (
     // eslint-disable-next-line jsx-a11y/anchor-has-content
     <a
       // @ts-expect-error: href specified twice needed to pass children and other user specified props

packages/docusaurus/src/client/serverEntry.js

@@ -22,22 +22,38 @@ import packageJson from '../../package.json';
 import preload from './preload';
 // eslint-disable-next-line import/no-unresolved
 import App from './App';
+import {
+  createStatefulLinksCollector,
+  ProvideLinksCollector,
+} from './LinksCollector';
 import ssrTemplate from './templates/ssr.html.template';
 
 // Renderer for static-site-generator-webpack-plugin (async rendering via promises).
 export default async function render(locals) {
-  const {routesLocation, headTags, preBodyTags, postBodyTags} = locals;
+  const {
+    routesLocation,
+    headTags,
+    preBodyTags,
+    postBodyTags,
+    onLinksCollected,
+    baseUrl,
+  } = locals;
   const location = routesLocation[locals.path];
   await preload(routes, location);
   const modules = new Set();
   const context = {};
+
+  const linksCollector = createStatefulLinksCollector();
   const appHtml = ReactDOMServer.renderToString(
     <Loadable.Capture report={(moduleName) => modules.add(moduleName)}>
       <StaticRouter location={location} context={context}>
-        <App />
+        <ProvideLinksCollector linksCollector={linksCollector}>
+          <App />
+        </ProvideLinksCollector>
       </StaticRouter>
     </Loadable.Capture>,
   );
+  onLinksCollected(location, linksCollector.getCollectedLinks());
 
   const helmet = Helmet.renderStatic();
   const htmlAttributes = helmet.htmlAttributes.toString();
@@ -59,7 +75,6 @@ export default async function render(locals) {
   const bundles = getBundles(manifest, modulesToBeLoaded);
   const stylesheets = (bundles.css || []).map((b) => b.file);
   const scripts = (bundles.js || []).map((b) => b.file);
-  const {baseUrl} = locals;
 
   const renderedHtml = eta.render(
     ssrTemplate.trim(),

packages/docusaurus/src/commands/build.ts

@@ -15,6 +15,8 @@ import {BundleAnalyzerPlugin} from 'webpack-bundle-analyzer';
 import merge from 'webpack-merge';
 import {STATIC_DIR_NAME} from '../constants';
 import {load} from '../server';
+import {handleBrokenLinks} from '../server/brokenLinks';
+
 import {BuildCLIOptions, Props} from '@docusaurus/types';
 import createClientConfig from '../webpack/client';
 import createServerConfig from '../webpack/server';
@@ -33,7 +35,13 @@ export default async function build(
   const props: Props = await load(siteDir, cliOptions.outDir);
 
   // Apply user webpack config.
-  const {outDir, generatedFilesDir, plugins} = props;
+  const {
+    outDir,
+    generatedFilesDir,
+    plugins,
+    siteConfig: {onBrokenLinks},
+    routes,
+  } = props;
 
   const clientManifestPath = path.join(
     generatedFilesDir,
@@ -55,7 +63,14 @@ export default async function build(
     },
   );
 
-  let serverConfig: Configuration = createServerConfig(props);
+  const allCollectedLinks: Record<string, string[]> = {};
+
+  let serverConfig: Configuration = createServerConfig({
+    props,
+    onLinksCollected: (staticPagePath, links) => {
+      allCollectedLinks[staticPagePath] = links;
+    },
+  });
 
   const staticDir = path.resolve(siteDir, STATIC_DIR_NAME);
   if (fs.existsSync(staticDir)) {
@@ -124,6 +139,8 @@ export default async function build(
     }),
   );
 
+  handleBrokenLinks({allCollectedLinks, routes, onBrokenLinks});
+
   const relativeDir = path.relative(process.cwd(), outDir);
   console.log(
     `\n${chalk.green('Success!')} Generated static files in ${chalk.cyan(
@@ -135,5 +152,6 @@ export default async function build(
   if (forceTerminate && !cliOptions.bundleAnalyzer) {
     process.exit(0);
   }
+
   return outDir;
 }

packages/docusaurus/src/server/__tests__/__snapshots__/brokenLinks.test.ts.snap

@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`brokenLinks getBrokenLinksErrorMessage 1`] = `
+"Broken links found!
+
+- Page path = /docs/mySourcePage:
+   -> link to ./myBrokenLink (resolved as: /docs/myBrokenLink)
+   -> link to ../otherBrokenLink (resolved as: /otherBrokenLink),
+
+- Page path = /otherSourcePage:
+   -> link to /badLink
+"
+`;

packages/docusaurus/src/server/__tests__/__snapshots__/config.test.ts.snap

@@ -20,6 +20,7 @@ Object {
   "baseUrl": "/",
   "customFields": Object {},
   "favicon": "img/docusaurus.ico",
+  "onBrokenLinks": "throw",
   "organizationName": "endiliey",
   "plugins": Array [
     Array [