feat: add --root cli option and make basic js api work

packages/core/src/cli/build.ts

@@ -0,0 +1,26 @@
+import { type RsbuildInstance, createRsbuild } from '@rsbuild/core';
+import { composeRsbuildEnvironments, pruneEnvironments } from '../config';
+import type { RslibConfig } from '../types/config';
+import { getAbsolutePath } from '../utils/helper';
+import type { BuildOptions } from './commands';
+
+export async function build(
+  config: RslibConfig,
+  options: Pick<BuildOptions, 'root' | 'lib' | 'watch'> = {},
+): Promise<RsbuildInstance> {
+  const cwd = process.cwd();
+  const root = options.root ? getAbsolutePath(cwd, options.root) : cwd;
+
+  const environments = await composeRsbuildEnvironments(config, root);
+  const rsbuildInstance = await createRsbuild({
+    rsbuildConfig: {
+      environments: pruneEnvironments(environments, options.lib),
+    },
+  });
+
+  await rsbuildInstance.build({
+    watch: options.watch,
+  });
+
+  return rsbuildInstance;
+}

packages/core/src/cli/commands.ts

@@ -1,15 +1,13 @@
-import { type RsbuildMode, createRsbuild } from '@rsbuild/core';
+import type { RsbuildMode } from '@rsbuild/core';
 import { type Command, program } from 'commander';
-import { build } from '../build';
-import {
-  composeRsbuildEnvironments,
-  loadConfig,
-  pruneEnvironments,
-} from '../config';
-import { startMFDevServer } from '../mf';
 import { logger } from '../utils/logger';
+import { build } from './build';
+import { getRslibConfig } from './init';
+import { inspect } from './inspect';
+import { startMFDevServer } from './mf';
 
 export type CommonOptions = {
+  root?: string;
   config?: string;
   envMode?: string;
   lib?: string[];
@@ -20,8 +18,8 @@ export type BuildOptions = CommonOptions & {
 };
 
 export type InspectOptions = CommonOptions & {
-  mode: RsbuildMode;
-  output: string;
+  mode?: RsbuildMode;
+  output?: string;
   verbose?: boolean;
 };
 
@@ -31,6 +29,10 @@ const applyCommonOptions = (command: Command) => {
       '-c --config <config>',
       'specify the configuration file, can be a relative or absolute path',
     )
+    .option(
+      '-r --root <root>',
+      'specify the project root directory, can be an absolute path or a path relative to cwd',
+    )
     .option(
       '--env-mode <mode>',
       'specify the env mode to load the `.env.[mode]` file',
@@ -60,11 +62,12 @@ export function runCli(): void {
     .description('build the library for production')
     .action(async (options: BuildOptions) => {
       try {
-        const rslibConfig = await loadConfig({
-          path: options.config,
-          envMode: options.envMode,
+        const { root, rslibConfig } = await getRslibConfig(options);
+        await build(rslibConfig, {
+          root,
+          lib: options.lib,
+          watch: options.watch,
         });
-        await build(rslibConfig, options);
       } catch (err) {
         logger.error('Failed to build.');
         logger.error(err);
@@ -88,21 +91,13 @@ export function runCli(): void {
     .action(async (options: InspectOptions) => {
       try {
         // TODO: inspect should output Rslib's config
-        const rslibConfig = await loadConfig({
-          path: options.config,
-          envMode: options.envMode,
-        });
-        const environments = await composeRsbuildEnvironments(rslibConfig);
-        const rsbuildInstance = await createRsbuild({
-          rsbuildConfig: {
-            environments: pruneEnvironments(environments, options.lib),
-          },
-        });
-        await rsbuildInstance.inspectConfig({
+        const { root, rslibConfig } = await getRslibConfig(options);
+        await inspect(rslibConfig, {
+          root,
+          lib: options.lib,
           mode: options.mode,
+          output: options.output,
           verbose: options.verbose,
-          outputPath: options.output,
-          writeToDisk: true,
         });
       } catch (err) {
         logger.error('Failed to inspect config.');
@@ -115,11 +110,11 @@ export function runCli(): void {
     .description('start Rsbuild dev server of Module Federation format')
     .action(async (options: CommonOptions) => {
       try {
-        const rslibConfig = await loadConfig({
-          path: options.config,
-          envMode: options.envMode,
+        const { root, rslibConfig } = await getRslibConfig(options);
+        // TODO: support lib option in mf dev server
+        await startMFDevServer(rslibConfig, {
+          root,
         });
-        await startMFDevServer(rslibConfig);
       } catch (err) {
         logger.error('Failed to start mf dev.');
         logger.error(err);

packages/core/src/cli/init.ts

@@ -0,0 +1,19 @@
+import { loadConfig } from '../config';
+import type { RslibConfig } from '../types';
+import { getAbsolutePath } from '../utils/helper';
+import type { CommonOptions } from './commands';
+
+export async function getRslibConfig(
+  options: CommonOptions,
+): Promise<{ root: string; rslibConfig: RslibConfig }> {
+  const cwd = process.cwd();
+  const root = options.root ? getAbsolutePath(cwd, options.root) : cwd;
+
+  const rslibConfig = await loadConfig({
+    cwd: root,
+    path: options.config,
+    envMode: options.envMode,
+  });
+
+  return { root, rslibConfig };
+}

packages/core/src/cli/inspect.ts

@@ -0,0 +1,32 @@
+import { type RsbuildInstance, createRsbuild } from '@rsbuild/core';
+import { composeRsbuildEnvironments, pruneEnvironments } from '../config';
+import type { RslibConfig } from '../types/config';
+import { getAbsolutePath } from '../utils/helper';
+import type { InspectOptions } from './commands';
+
+export async function inspect(
+  config: RslibConfig,
+  options: Pick<
+    InspectOptions,
+    'root' | 'lib' | 'mode' | 'output' | 'verbose'
+  > = {},
+): Promise<RsbuildInstance> {
+  const cwd = process.cwd();
+  const root = options.root ? getAbsolutePath(cwd, options.root) : cwd;
+
+  const environments = await composeRsbuildEnvironments(config, root);
+  const rsbuildInstance = await createRsbuild({
+    rsbuildConfig: {
+      environments: pruneEnvironments(environments, options.lib),
+    },
+  });
+
+  await rsbuildInstance.inspectConfig({
+    mode: options.mode,
+    verbose: options.verbose,
+    outputPath: options.output,
+    writeToDisk: true,
+  });
+
+  return rsbuildInstance;
+}

packages/core/src/mf.ts → packages/core/src/cli/mf.ts

@@ -1,20 +1,28 @@
 import { createRsbuild, mergeRsbuildConfig } from '@rsbuild/core';
-import { composeCreateRsbuildConfig } from './config';
-
 import type { RsbuildConfig, RsbuildInstance } from '@rsbuild/core';
-import type { RslibConfig } from './types';
+import { composeCreateRsbuildConfig } from '../config';
+import type { RslibConfig } from '../types';
+import { getAbsolutePath } from '../utils/helper';
+import type { CommonOptions } from './commands';
 
 export async function startMFDevServer(
   config: RslibConfig,
+  options: Pick<CommonOptions, 'root'> = {},
 ): Promise<RsbuildInstance | undefined> {
-  const rsbuildInstance = await initMFRsbuild(config);
+  const cwd = process.cwd();
+  const root = options.root ? getAbsolutePath(cwd, options.root) : cwd;
+  const rsbuildInstance = await initMFRsbuild(config, root);
   return rsbuildInstance;
 }
 
 async function initMFRsbuild(
   rslibConfig: RslibConfig,
+  root: string,
 ): Promise<RsbuildInstance | undefined> {
-  const rsbuildConfigObject = await composeCreateRsbuildConfig(rslibConfig);
+  const rsbuildConfigObject = await composeCreateRsbuildConfig(
+    rslibConfig,
+    root,
+  );
   const mfRsbuildConfig = rsbuildConfigObject.find(
     (config) => config.format === 'mf',
   );

packages/core/src/config.ts

@@ -1084,12 +1084,11 @@ const composeExternalHelpersConfig = (
   return defaultConfig;
 };
 
-async function composeLibRsbuildConfig(config: LibConfig, configPath: string) {
+async function composeLibRsbuildConfig(config: LibConfig, root: string) {
   checkMFPlugin(config);
-  const rootPath = dirname(configPath);
-  const pkgJson = readPackageJson(rootPath);
+  const pkgJson = readPackageJson(root);
   const { compilerOptions } = await loadTsconfig(
-    rootPath,
+    root,
     config.source?.tsconfigPath,
   );
   const cssModulesAuto = config.output?.cssModules?.auto ?? true;
@@ -1148,7 +1147,7 @@ async function composeLibRsbuildConfig(config: LibConfig, configPath: string) {
   const { entryConfig, lcp } = await composeEntryConfig(
     config.source?.entry,
     config.bundle,
-    dirname(configPath),
+    root,
     cssModulesAuto,
   );
   const cssConfig = composeCssConfig(lcp, config.bundle);
@@ -1192,10 +1191,9 @@ async function composeLibRsbuildConfig(config: LibConfig, configPath: string) {
 
 export async function composeCreateRsbuildConfig(
   rslibConfig: RslibConfig,
-  path?: string,
+  root: string,
 ): Promise<RsbuildConfigWithLibInfo[]> {
   const constantRsbuildConfig = await createConstantRsbuildConfig();
-  const configPath = path ?? rslibConfig._privateMeta?.configFilePath!;
   const { lib: libConfigsArray, ...sharedRsbuildConfig } = rslibConfig;
 
   if (!libConfigsArray) {
@@ -1212,10 +1210,7 @@ export async function composeCreateRsbuildConfig(
 
     // Merge the configuration of each environment based on the shared Rsbuild
     // configuration and Lib configuration in the settings.
-    const libRsbuildConfig = await composeLibRsbuildConfig(
-      userConfig,
-      configPath,
-    );
+    const libRsbuildConfig = await composeLibRsbuildConfig(userConfig, root);
 
     // Reset certain fields because they will be completely overridden by the upcoming merge.
     // We don't want to retain them in the final configuration.
@@ -1271,11 +1266,11 @@ export async function composeCreateRsbuildConfig(
 
 export async function composeRsbuildEnvironments(
   rslibConfig: RslibConfig,
-  path?: string,
+  root: string,
 ): Promise<Record<string, EnvironmentConfig>> {
   const rsbuildConfigWithLibInfo = await composeCreateRsbuildConfig(
     rslibConfig,
-    path,
+    root,
   );
 
   // User provided ids should take precedence over generated ids.

packages/core/src/index.ts

@@ -1,11 +1,13 @@
 export { prepareCli } from './cli/prepare';
 export { runCli } from './cli/commands';
+export { build } from './cli/build';
+export { inspect } from './cli/inspect';
+export { startMFDevServer } from './cli/mf';
 export {
   defineConfig,
   loadConfig,
   composeCreateRsbuildConfig as unstable_composeCreateRsbuildConfig,
 } from './config';
-export { build } from './build';
 export { logger } from './utils/logger';
 export type * from './types';
 

packages/core/src/utils/helper.ts

@@ -1,6 +1,6 @@
 import fs from 'node:fs';
 import fsP from 'node:fs/promises';
-import path from 'node:path';
+import path, { isAbsolute, join } from 'node:path';
 import type { RsbuildPlugins } from '@rsbuild/core';
 import color from 'picocolors';
 
@@ -109,6 +109,10 @@ export async function calcLongestCommonPath(
   return lca;
 }
 
+export function getAbsolutePath(base: string, filepath: string): string {
+  return isAbsolute(filepath) ? filepath : join(base, filepath);
+}
+
 export const readPackageJson = (rootPath: string): undefined | PkgJson => {
   const pkgJsonPath = path.join(rootPath, './package.json');
 

packages/core/tests/__snapshots__/config.test.ts.snap

@@ -72,7 +72,7 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config 1
           "pnpapi",
         ],
         "filename": {
-          "js": "[name].js",
+          "js": "[name].mjs",
         },
         "filenameHash": false,
         "minify": {

tests/integration/cli/build.test.ts

@@ -51,4 +51,40 @@ describe('build command', async () => {
       ]
     `);
   });
+
+  test('--config', async () => {
+    await fse.remove(path.join(__dirname, 'dist'));
+    execSync(
+      'npx rslib build --config ./custom-config/rslib.config.custom.ts',
+      {
+        cwd: __dirname,
+      },
+    );
+
+    const files = await globContentJSON(path.join(__dirname, 'dist'));
+    const fileNames = Object.keys(files).sort();
+    expect(fileNames).toMatchInlineSnapshot(`
+      [
+        "<ROOT>/tests/integration/cli/dist/custom/index.cjs",
+        "<ROOT>/tests/integration/cli/dist/custom/index.js",
+      ]
+    `);
+  });
+
+  test('--root', async () => {
+    await fse.remove(path.join(__dirname, 'dist'));
+    console.log('__dirname: ', __dirname);
+    execSync('npx rslib build --root custom-root', {
+      cwd: __dirname,
+    });
+
+    const files = await globContentJSON(path.join(__dirname, 'dist'));
+    const fileNames = Object.keys(files).sort();
+    expect(fileNames).toMatchInlineSnapshot(`
+      [
+        "<ROOT>/tests/integration/cli/dist/root/index.cjs",
+        "<ROOT>/tests/integration/cli/dist/root/index.js",
+      ]
+    `);
+  });
 });