refactor(cli): make the CLI an even thinner wrapper around command functions

packages/docusaurus/bin/docusaurus.mjs

@@ -8,7 +8,6 @@
 
 // @ts-check
 
-import fs from 'fs-extra';
 import logger from '@docusaurus/logger';
 import cli from 'commander';
 import {DOCUSAURUS_VERSION} from '@docusaurus/utils';
@@ -27,8 +26,6 @@ import beforeCli from './beforeCli.mjs';
 
 await beforeCli();
 
-const resolveDir = (dir = '.') => fs.realpath(dir);
-
 cli.version(DOCUSAURUS_VERSION).usage('<command> [options]');
 
 cli
@@ -54,9 +51,9 @@ cli
     '--no-minify',
     'build website without minimizing JS bundles (default: false)',
   )
-  .action(async (siteDir, options) => {
-    await build(await resolveDir(siteDir), options);
-  });
+  // @ts-expect-error: Promise<string> is not assignable to Promise<void>... but
+  // good enough here.
+  .action(build);
 
 cli
   .command('swizzle [themeName] [componentName] [siteDir]')
@@ -80,9 +77,7 @@ cli
     'copy TypeScript theme files when possible (default: false)',
   )
   .option('--danger', 'enable swizzle for unsafe component of themes')
-  .action(async (themeName, componentName, siteDir, options) =>
-    swizzle(await resolveDir(siteDir), themeName, componentName, options),
-  );
+  .action(swizzle);
 
 cli
   .command('deploy [siteDir]')
@@ -103,9 +98,7 @@ cli
     '--skip-build',
     'skip building website before deploy it (default: false)',
   )
-  .action(async (siteDir, options) =>
-    deploy(await resolveDir(siteDir), options),
-  );
+  .action(deploy);
 
 cli
   .command('start [siteDir]')
@@ -130,9 +123,7 @@ cli
     '--no-minify',
     'build website without minimizing JS bundles (default: false)',
   )
-  .action(async (siteDir, options) =>
-    start(await resolveDir(siteDir), options),
-  );
+  .action(start);
 
 cli
   .command('serve [siteDir]')
@@ -152,14 +143,12 @@ cli
     '--no-open',
     'do not open page in the browser (default: false, or true in CI)',
   )
-  .action(async (siteDir, options) =>
-    serve(await resolveDir(siteDir), options),
-  );
+  .action(serve);
 
 cli
   .command('clear [siteDir]')
   .description('Remove build artifacts.')
-  .action(async (siteDir) => clear(await resolveDir(siteDir)));
+  .action(clear);
 
 cli
   .command('write-translations [siteDir]')
@@ -180,9 +169,7 @@ cli
     '--messagePrefix <messagePrefix>',
     'Allows to init new written messages with a given prefix. This might help you to highlight untranslated message by making them stand out in the UI (default: "")',
   )
-  .action(async (siteDir, options) =>
-    writeTranslations(await resolveDir(siteDir), options),
-  );
+  .action(writeTranslations);
 
 cli
   .command('write-heading-ids [siteDir] [files...]')
@@ -192,9 +179,7 @@ cli
     "keep the headings' casing, otherwise make all lowercase (default: false)",
   )
   .option('--overwrite', 'overwrite existing heading IDs (default: false)')
-  .action(async (siteDir, files, options) =>
-    writeHeadingIds(await resolveDir(siteDir), files, options),
-  );
+  .action(writeHeadingIds);
 
 cli.arguments('<command>').action((cmd) => {
   cli.outputHelp();
@@ -221,7 +206,7 @@ function isInternalCommand(command) {
 }
 
 if (!isInternalCommand(process.argv.slice(2)[0])) {
-  await externalCommand(cli, await resolveDir('.'));
+  await externalCommand(cli);
 }
 
 if (!process.argv.slice(2).length) {

packages/docusaurus/src/commands/build.ts

@@ -38,14 +38,16 @@ export type BuildCLIOptions = Pick<
 };
 
 export async function build(
-  siteDir: string,
-  cliOptions: Partial<BuildCLIOptions>,
+  siteDirParam: string = '.',
+  cliOptions: Partial<BuildCLIOptions> = {},
   // When running build, we force terminate the process to prevent async
   // operations from never returning. However, if run as part of docusaurus
   // deploy, we have to let deploy finish.
   // See https://github.com/facebook/docusaurus/pull/2496
   forceTerminate: boolean = true,
 ): Promise<string> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   ['SIGINT', 'SIGTERM'].forEach((sig) => {
     process.on(sig, () => process.exit());
   });

packages/docusaurus/src/commands/clear.ts

@@ -26,7 +26,9 @@ async function removePath(entry: {path: string; description: string}) {
   }
 }
 
-export async function clear(siteDir: string): Promise<void> {
+export async function clear(siteDirParam: string = '.'): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   const generatedFolder = {
     path: path.join(siteDir, GENERATED_FILES_DIR_NAME),
     description: 'generated folder',

packages/docusaurus/src/commands/deploy.ts

@@ -41,9 +41,11 @@ function shellExecLog(cmd: string) {
 }
 
 export async function deploy(
-  siteDir: string,
-  cliOptions: Partial<DeployCLIOptions>,
+  siteDirParam: string = '.',
+  cliOptions: Partial<DeployCLIOptions> = {},
 ): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   const {outDir, siteConfig, siteConfigPath} = await loadContext({
     siteDir,
     config: cliOptions.config,

packages/docusaurus/src/commands/external.ts

@@ -5,14 +5,13 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import fs from 'fs-extra';
 import {loadContext} from '../server';
 import {initPlugins} from '../server/plugins/init';
 import type {CommanderStatic} from 'commander';
 
-export async function externalCommand(
-  cli: CommanderStatic,
-  siteDir: string,
-): Promise<void> {
+export async function externalCommand(cli: CommanderStatic): Promise<void> {
+  const siteDir = await fs.realpath('.');
   const context = await loadContext({siteDir});
   const plugins = await initPlugins(context);
 

packages/docusaurus/src/commands/serve.ts

@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import fs from 'fs-extra';
 import http from 'http';
 import path from 'path';
 import logger from '@docusaurus/logger';
@@ -24,9 +25,11 @@ export type ServeCLIOptions = HostPortOptions &
   };
 
 export async function serve(
-  siteDir: string,
-  cliOptions: Partial<ServeCLIOptions>,
+  siteDirParam: string = '.',
+  cliOptions: Partial<ServeCLIOptions> = {},
 ): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   const buildDir = cliOptions.dir ?? DEFAULT_BUILD_DIR_NAME;
   let dir = path.resolve(siteDir, buildDir);
 

packages/docusaurus/src/commands/start.ts

@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import fs from 'fs-extra';
 import path from 'path';
 import _ from 'lodash';
 import logger from '@docusaurus/logger';
@@ -35,9 +36,11 @@ export type StartCLIOptions = HostPortOptions &
   };
 
 export async function start(
-  siteDir: string,
-  cliOptions: Partial<StartCLIOptions>,
+  siteDirParam: string = '.',
+  cliOptions: Partial<StartCLIOptions> = {},
 ): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   process.env.NODE_ENV = 'development';
   process.env.BABEL_ENV = 'development';
   logger.info('Starting the development server...');

packages/docusaurus/src/commands/swizzle/__tests__/index.test.ts

@@ -111,7 +111,7 @@ async function createTestSite() {
     component: string;
     typescript?: boolean;
   }) {
-    return swizzleWithExit(siteDir, FixtureThemeName, component, {
+    return swizzleWithExit(FixtureThemeName, component, siteDir, {
       wrap: true,
       danger: true,
       typescript,
@@ -125,7 +125,7 @@ async function createTestSite() {
     component: string;
     typescript?: boolean;
   }) {
-    return swizzleWithExit(siteDir, FixtureThemeName, component, {
+    return swizzleWithExit(FixtureThemeName, component, siteDir, {
       eject: true,
       danger: true,
       typescript,

packages/docusaurus/src/commands/swizzle/index.ts

@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import fs from 'fs-extra';
 import logger from '@docusaurus/logger';
 import {getThemeName, getThemePath, getThemeNames} from './themes';
 import {getThemeComponents, getComponentName} from './components';
@@ -87,11 +88,13 @@ If you want to swizzle it, use the code=${'--danger'} flag, or confirm that you
 }
 
 export async function swizzle(
-  siteDir: string,
-  themeNameParam: string | undefined,
-  componentNameParam: string | undefined,
-  optionsParam: Partial<SwizzleCLIOptions>,
+  themeNameParam: string | undefined = undefined,
+  componentNameParam: string | undefined = undefined,
+  siteDirParam: string = '.',
+  optionsParam: Partial<SwizzleCLIOptions> = {},
 ): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   const options = normalizeOptions(optionsParam);
   const {list, danger, typescript} = options;
 

packages/docusaurus/src/commands/writeHeadingIds.ts

@@ -41,10 +41,12 @@ async function getPathsToWatch(siteDir: string): Promise<string[]> {
 }
 
 export async function writeHeadingIds(
-  siteDir: string,
-  files: string[] | undefined,
-  options: WriteHeadingIDOptions,
+  siteDirParam: string = '.',
+  files: string[] = [],
+  options: WriteHeadingIDOptions = {},
 ): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   const markdownFiles = await safeGlobby(
     files ?? (await getPathsToWatch(siteDir)),
     {

packages/docusaurus/src/commands/writeTranslations.ts

@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import fs from 'fs-extra';
 import path from 'path';
 import {loadContext, type LoadContextOptions} from '../server';
 import {initPlugins} from '../server/plugins/init';
@@ -75,9 +76,11 @@ async function writePluginTranslationFiles({
 }
 
 export async function writeTranslations(
-  siteDir: string,
-  options: Partial<WriteTranslationsCLIOptions>,
+  siteDirParam: string = '.',
+  options: Partial<WriteTranslationsCLIOptions> = {},
 ): Promise<void> {
+  const siteDir = await fs.realpath(siteDirParam);
+
   const context = await loadContext({
     siteDir,
     config: options.config,