@cybozu/duck

Serves and builds an app with Google Closure Compiler/Library/Templates. An alternative to plovr.

Install

$ npm i -D @cybozu/duck

Usage

duck <command>

Commands:
  duck serve [entryConfigDir]     Start dev server
  duck build [entryConfigDir]     Build Soy, deps.js and JS
  duck build:js [entryConfigDir]  Compile JS files
  duck build:soy                  Compile Soy templates
  duck build:deps                 Generate deps.js
  duck clean:soy                  Remove all compiled .soy.js
  duck clean:deps                 Remove generated deps.js
  duck completion                 Generate completion script for bash/zsh

Options:
  -v, --version  Show version number                                                     [boolean]
  -h, --help     Show help                                                               [boolean]

CLI options overwrite config file

duck serve

duck serve [entryConfigDir]

Start dev server

Options:
  --inputsRoot            A root directory to serve                                       [string]
  --closureLibraryDir     A root directory of Closure Library                             [string]
  --depsJs                A path to deps.js to save and load                              [string]
  --depsWorkers           The number of workers to analyze deps              [number] [default: 4]
  --config                A path to duck.config.js, the extension can be ommited          [string]
  --nonTTY, --noTTY, -n   Output in nonTTY mode                         [boolean] [default: false]
  --skipInitialBuild, -s  Skip initial building of Soy and deps.js      [boolean] [default: false]
  --port                  A port number to listen                         [number] [default: 9810]
  --host                  A host to listen                         [string] [default: "localhost"]
  -v, --version           Show version number                                            [boolean]
  -h, --help              Show help                                                      [boolean]

duck build

duck build [entryConfigDir]

Build Soy, deps.js and JS

Options:
  --entryConfigs, -e      Entry config files (this option ignores entryConfigDir)          [array]
  --closureLibraryDir     A root directory of Closure Library                             [string]
  --config                A path to duck.config.js, the extension can be ommited          [string]
  --concurrency, -c       Concurrency limit of Closure Compiler                           [number]
  --batch                 Build in batch mode (on AWS or local for debug)[choices: "aws", "local"]
  --reporters             Test reporters ("text", "xunit" or "json")   [array] [default: ["text"]]
  --reporterOptions       Test reporter options
  --printConfig, -p       Print effective configs for compilers         [boolean] [default: false]
  --depsJs                A path to deps.js to save and load                              [string]
  --nonTTY, --noTTY, -n   Output in nonTTY mode                         [boolean] [default: false]
  --depsWorkers           The number of workers to analyze deps              [number] [default: 4]
  --skipInitialBuild, -s  Skip initial building of Soy and deps.js      [boolean] [default: false]
  --soyJarPath            A path to Soy.jar                                               [string]
  --soyFileRoots          Root directories of soy files                                    [array]
  --soyClasspaths         Classpaths for Closure Templates                                 [array]
  --watch, -w             Re-compile incrementally when files change    [boolean] [default: false]
  -v, --version           Show version number                                            [boolean]
  -h, --help              Show help                                                      [boolean]

duck.config.js

Create a config file duck.config.js or duck.config.json on your project root. Set every path as a relative path from the location of duck.config.js.

module.exports = {
  /**
   * Common settings
   */
  // (Required) A path to Closure Library direcotry
  closureLibraryDir: "node_modules/google-closure-library",
  // (Required) A directory where entry config JSONs are stored flat
  entryConfigDir: "entry-configs",

  /**
   * Generating and loading deps.js
   */
  // A path to deps.js to save and load in build and serve commands
  depsJs: "build/deps.js",
  // Directories ignored when building deps.js
  depsJsIgnoreDirs: ["src/third_party"],
  // The number of workers to build deps.js. Node v10 uses processes and node v12+ uses threads. (default: 4)
  depsWorkers: 2,

  /**
   * Building Soy
   */
  // (Required) A path to Closure Templates JAR
  soyJarPath: "lib/closure-templates.jar",
  // (Required) Directories where Closure Templates .soy files are stored
  soyFileRoots: ["src/js"],
  // Classpaths for Closure Templates plugins
  soyClasspaths: ["lib/plugin.jar"],
  // Send srcs to closure-templates as relative paths from this.
  // Also change cwd to this and run closure-templates. (default: undefined)
  soySrcsRelativeFrom: "src",
  // Options for Closure Templates CLI
  soyOptions: {
    outputDirectory: "src/js/soy",
  },

  /**
   * Compiling JavaScript
   */
  // Concurrency of Closure Compiler (default: 1,000 if AWS batch mode, otherwise 1)
  concurrency: 4,
  // Build in batch mode with faast.js on "aws" for production or "local" for debug (default: undefined)
  batch: "aws",
  // Custom Closure Compiler package used in AWS batch mode (default: undefined)
  batchAwsCustomCompiler: {
    name: "my-custom-closure-compiler",
    version: "^1.0.0",
  },
  // Max chunk size in bytes for spliting return value from faastjs module (default: 204,800 (200kb))
  batchMaxChunkSize?: number;
  // Options for faast.js in batch mode. See https://faastjs.org/docs/api/faastjs.awsoptions
  batchOptions: {},
  // Reporters (choose from "json", "text" or "xunit")
  reporters: ["text", "xunit"],
  // Options for each test reporter
  reporterOptions: {
    text: {
      // Output errors to stderr or not
      stderr: false,
      // A directory where reporters output
      outputDir: "test-results/text",
    },
    xunit: {},
  },

  /**
   * Serve
   */
  // (Required) A root directory scanned to build deps.js and delivered as static assets
  inputsRoot: "src/inputs",
  // Hostname for serve command (default: 0.0.0.0)
  host: "localhost",
  // Port number for serve command (default: 9810)
  port: 1234,
  // Use HTTP/2 in serve command (deafult: false)
  http2: true,
  // Settings for HTTPS (HTTP/2) (default: not specified, HTTP is used)
  https: {
    // A path to a private key
    keyPath: "path/to/key.pem",
    // A path to a self-signed certificate
    certPath: "path/to/cert.pem",
  },
};

Also see examples.

Limitation

• Closure Compiler >= v20180910.0.0
• Closure Templates >= 2019-03-07
• Closure Library < v20200224.0.0 (partial)
  • NOTE: Closure Compiler doesn't support goog.requireType() in chunks feature. Closure Library v20200224+ includes goog.requireType(), so you cannot use it with chunks. See chunks doesn't work with goog.requireType · Issue #3931 · google/closure-compiler
• google-closure-deps >= v20210406

Tips

Batch mode using AWS Lambda

duck provides batch mode that compiles all entry points simultaneously in parallel on AWS Lambda with faast.js.

1. Setting AWS credentials in Node.js (See AWS document)
2. Configure batchOptions in duck.config.js. It's used for faast.js as AWSOptions.

const closureVersion = require("google-closure-compiler/package.json").version;

module.exports = {
  batchOptions: {
    region: "ap-northeast-1",
    awsLambdaOptions: {
      Runtime: "nodejs10.x",
    },
    include: ["path/to/your/source/**/*.js"],
    exclude: ["**/*_spec.js"],
    packageJson: {
      dependencies: {
        "google-closure-compiler-linux": closureVersion,
        "google-closure-library": closureVersion,
      },
    },
  },
};

3. Run build or build:js command with --batch aws.

$ duck build --batch aws

How to debug in batch mode?

• Use --batch local for local debugging
• Use DEBUG=faast:info or other log level to get more debug information
• Get logUrl from debug info and view it in CloudWatch logs
• Use FAAST_PACKAGE_DIR=foo/bar to investigate a package sent to Lambda

Also see faast.js document for more information.

How to use HTTPS and HTTP2 in duck serve?

Create a self-signed certificate like

$ openssl req -x509 -newkey rsa:4096 -keyout duck-key.pem -out duck-cert.pem -days 365 -nodes -subj '/CN=localhost'

Then specify them and enable http2 in duck.config.js.

module.exports = {
  http2: true,
  https: {
    keyPath: "./path/to/duck-key.pem",
    certPath: "./path/to/duck-cert.pem",
  },
};

bash/zsh-completion for commands and options

Initial setting:

$ duck completion >> ~/.bashrc
# or
$ duck completion >> ~/.zshrc

Then, you can complete commands and options with TAB !

$ duck build:<TAB>
build:deps  -- Generate deps.js
build:js    -- Compile JS files
build:soy   -- Compile Soy templates

License

MIT License: Cybozu, Inc.