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Rslib
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      • CLI

      Rslib comes with a lightweight CLI that includes commands such as rslib and rslib inspect.

      All commands

      To view all available CLI commands, run the following command in the project directory:

      npx rslib -h

      The output is shown below:

      Usage:
  $ rslib [command] [options]

Commands:
  build    build the library for production (default if no command is given)
  inspect  inspect the Rsbuild / Rspack configs of Rslib projects
  mf-dev   start Rsbuild dev server of Module Federation format

      Common flags

      Rslib CLI provides several common flags that can be used with all commands:

      FlagDescription
      -c, --config <config>Specify the configuration file, can be a relative or absolute path, see Specify config file
      --config-loader <loader>Set the config file loader (auto | jiti | native), see Specify config loader
      --env-dir <dir>Specify the directory to load .env files, see Rsbuild - Env directory
      --env-mode <mode>Specify the env mode to load the .env.[mode] file, see Rsbuild - Env mode
      -h, --helpDisplay help for command
      --lib <id>Specify the library to run commands (repeatable, e.g. --lib esm --lib cjs), see lib.id to learn how to get or set the ID of the library
      --log-level <level>Set the log level (info | warn | error | silent), see logLevel
      --no-envDisable loading of .env files
      -r, --root <root>Specify the project root directory, can be an absolute path or a path relative to cwd

      rslib

      The rslib command will build the outputs for production in the dist/ directory by default. rslib build is an alias for the rslib command.

      Usage:
  $ rslib

Options:
  -w, --watch            turn on watch mode, watch for changes and rebuild
  --entry <entry>        set entry file or pattern (repeatable)
  --dist-path <dir>      set output directory
  --bundle               enable bundle mode (use --no-bundle to disable)
  --format <format>      specify the output format (esm | cjs | umd | mf | iife)
  --syntax <syntax>      set build syntax target (repeatable)
  --target <target>      set runtime target (web | node)
  --dts                  emit declaration files (use --no-dts to disable)
  --externals <pkg>      add package to externals (repeatable)
  --minify               minify output (use --no-minify to disable)
  --clean                clean output directory before build (use --no-clean to disable)
  --auto-extension       control automatic extension redirect (use --no-auto-extension to disable)
  --auto-external        control automatic dependency externalization (use --no-auto-external to disable)
  --tsconfig <path>      use specific tsconfig (relative to project root)
      Note

      If the Rslib configuration file is not present in your project, the CLI will automatically use the default configuration containing only a single lib and apply all build options from the command line. You can add a configuration file once you need a more complex configuration or want to build outputs in multiple formats.

      Watch mode

      Use rslib --watch or rslib -w to enable watch mode. Rslib watches for source file changes and automatically rebuilds when they change.

      If you need to adjust the configuration based on whether watch mode is enabled, check process.argv:

      rslib.config.ts
      import { defineConfig } from '@rslib/core';

const isWatch = process.argv.some((arg) => arg === '--watch' || arg === '-w');

export default defineConfig({
  source: {
    alias: {
      '@request': isWatch ? './src/request.dev.js' : './src/request.prod.js',
    },
  },
});

      rslib inspect

      The rslib inspect command inspects a project's Rslib config and the corresponding Rsbuild and Rspack configs.

      Usage:
  $ rslib inspect

Options:
  --mode <mode>         set the build mode (development | production)
  --output <output>     set the output path for inspection results (default: ".rsbuild")
  --verbose             show complete function definitions in output

      When you run the command npx rslib inspect in the project root directory, the following files will be generated in the dist/.rsbuild directory of the project:

      • rsbuild.config.mjs: Represents the Rsbuild configuration used during the build.
      • rspack.config.esm.mjs: Represents the Rspack configuration used during the build.
      • rslib.config.mjs: Represents the resolved Rslib configuration.
      ➜ npx rslib inspect

config inspection completed, generated files:

  - Rsbuild config: /project/dist/.rsbuild/rsbuild.config.mjs
  - Rspack Config (esm): /project/dist/.rsbuild/rspack.config.esm.mjs
  - Rslib Config: /project/dist/.rsbuild/rslib.config.mjs

      Setting mode

      By default, mode is inferred from process.env.NODE_ENV: it is 'development' when NODE_ENV is 'development', and 'production' otherwise.

      When mode is 'production', the inspect command outputs production mode configurations for all libraries. You can add the --mode development option to output development mode configurations for libraries with format set to mf:

      rslib inspect --mode development

      Verbose content

      By default, the inspect command omits function bodies in the configuration object. To output complete function content, add the --verbose option:

      rslib inspect --verbose

      Multiple output formats

      If the current project has multiple output formats, such as ESM artifact and CJS artifact simultaneously, multiple Rspack configuration files will be generated in the dist/.rsbuild directory.

      ➜ npx rslib inspect

config inspection completed, generated files:

  - Rsbuild config (esm): /project/dist/.rsbuild/rsbuild.config.esm.mjs
  - Rsbuild config (cjs): /project/dist/.rsbuild/rsbuild.config.cjs.mjs
  - Rspack Config (esm): /project/dist/.rsbuild/rspack.config.esm.mjs
  - Rspack Config (cjs): /project/dist/.rsbuild/rspack.config.cjs.mjs
  - Rslib Config: /project/dist/.rsbuild/rslib.config.mjs

      rslib mf-dev

      The rslib mf-dev command is utilized to start Rsbuild dev server for the Module Federation format.

      This enables you to develop and debug your mf format module within the host app.