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    babel-plugin-jsdoc-closure

    1.5.1 • Public • Published

    babel-plugin-jsdoc-closure

    Transpiles JSDoc types from namepaths with module identifiers to types for Closure Compiler.

    This is useful for type checking and building an application or library from a set of ES modules with Closure Compiler, without the use of any additional bundler.

    Installation

    npm install babel-cli babel-plugin-jsdoc-closure
    

    Configuration

    Create a .babelrc file in the root of your project to enable the plugin:

    {
      "plugins": ["jsdoc-closure"],
    }

    Note: When your code uses Closure type casts (i.e. something like /** @type {Custom} */ (foo)), you need to configure Babel to use recast as parser and generator by modifying your .babelrc file:

    {
      "plugins": ["jsdoc-closure"],
      "parserOpts": {
        "parser": "recast"
      },
      "generatorOpts": {
        "generator": "recast"
      }
    }

    You will also need to install recast to make this work:

    npm install recast
    

    To run the transform on your sources (src/) and output them to build/, run

    node_modules/.bin/babel --out-dir build src
    

    To build your project, create a simple build script (e.g. build.js) like this:

    const Compiler = require('google-closure-compiler').compiler;
     
    const compiler = new Compiler({
      js: [
        'build/**.js',
        // add directories for your dependencies, if any, here
      ],
      entry_point: 'build/index.js',
      module_resolution: 'NODE',
      dependency_mode: 'STRICT',
      process_common_js_modules: true,
      jscomp_error: ['newCheckTypes'],
      // Uncomment and modify for dependencies without Closure annotations
      //hide_warnings_for: ['node_modules']
      js_output_file: 'bundle.js'
    });
     
    compiler.run((exit, out, err) => {
      if (exit) {
        process.stderr.write(err, () => process.exit(exit));
      } else {
        process.stderr.write(out);
        process.stderr.write(err);
      }
    });

    To run the Compiler, simply call

    node build.js
    

    What the plugin does

    Convert module namepaths to imported types

    Closure Compiler does not allow JSDoc's namepaths with module identifiers as types. Instead, with module_resolution: 'NODE', it recognizes types that are imported from other files. Let's say you have a file foo/Bar.js with the following:

    /** @module foo/Bar */
     
    /**
     * @constructor
     * @param {string} name Name.
     */
    const Bar = function(name) {
      this.name = name;
    };
    export default Bar;

    Then you can use the Bar type in another module with

    /**
     * @param {module:foo/Bar} bar Bar.
     */
    function foo(bar) {}

    This is fine for JSDoc, and this plugin transforms it to something like

    /**
     * @param {foo$Bar} bar Bar.
     */
    function foo(bar) {}
    const foo$Bar = require('./foo/Bar');

    With this, the type definition is recognized by Closure Compiler.

    Convert JSDoc object typedefs to Closure structural interfaces

    JSDoc uses a nice, documentable format for {Object} typedefs:

    /**
     * @typedef {Object} Foo
     * @property {string} bar Bar.
     * @property {module:types.Baz} baz Baz.
     */

    Such typedefs are not understood by Closure compiler, so they are transformed to something like

    /** @interface */
    export function Foo() {};
     
    /** @type {(string)} */
    Foo.prototype.bar;
     
    /** @type {(_types_Baz)} */
    Foo.prototype.baz;

    Properties marked as optional with JSDoc notation are also handled. The plugin will transforms @property {number} [foo] Foo. or @property {number=} foo Foo. to foo: (undefined|number).

    Keywords

    none

    Install

    npm i babel-plugin-jsdoc-closure

    DownloadsWeekly Downloads

    18

    Version

    1.5.1

    License

    MIT

    Unpacked Size

    21.7 kB

    Total Files

    12

    Last publish

    Collaborators

    • ahocevar
    • tschaub