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grunt-strip-code

Remove dev and test only code in production builds

grunt-strip-code

The grunt-strip-code plugin is used to remove sections of code from production builds that are only needed in development and test environments. grunt-strip-code uses start and end comments to identify the code sections to strip out. For example:

/* test-code */
removeMeInProduction();
/* end-test-code */
 
doNotRemoveMe();

A use-case for this practice is to make private JavaScript functions accessible to unit tests without exposing them in production builds. This blog post goes into more detail about the concept and implementation.

Branch CI Tests
master
develop

This plugin requires Grunt >=0.4.0 <=1.0.1

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-strip-code --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-strip-code');

In your project's Gruntfile, add a section named strip_code to the data object passed into grunt.initConfig().

grunt.initConfig({
  strip_code: {
    options: {
      // Task-specific options go here. 
    },
    your_target: {
      // Target-specific file lists and/or options go here. 
    },
  },
})

Type: Array Default value:

blocks: [
    {
        start_block: "/* test-code */",
        end_block: "/* end-test-code */"
    }
]

The blocks array contains one or more objects which define the boundaries of the text blocks to be deleted.

Type: String Default value: /* test-code */

The text of the opening comment used to identify code to strip.

Type: String Default value: /* end-test-code */

The text of the closing comment used to identify code to strip.

Type: array Default value: []

You can also supply your own RegExps to match against.

Type: boolean Default value: false

Turns on check that makes sure if you blocks have same amount of start/end pairs in your code.

Type: boolean Default value: false

Turns on check that makes sure if you blocks does not intersect between each other.

The following source code exposes the bar function to the public API for testing, but the bar function should not be accessible in the released library. grunt-strip-code (with the default options) will remove the comment blocks from the example below keeping the bar function private in production:

(function() {
 
  function bar() {
    doSomething();
  }
 
  var api = {
    foo: function() {
      bar();
      return "foo";
    }
  }
 
  /* test-code */
  api._bar = bar;
  /* end-test-code */
 
  return api;
}());

The following configuration will strip out code that begins with the /* start-test-block */ comment and ends with the /* end-test-block */ comment, and code that begins with the <!-- start-html-test-code --> comment and ends with the <!-- end-html-test-code --> comment from all .js files in the dist/ folder.

grunt.initConfig({
  strip_code: {
    options: {
      blocks: [
        {
          start_block: "/* start-test-block */",
          end_block: "/* end-test-block */"
        },
        {
          start_block: "<!-- start-html-test-code -->",
          end_block: "<!-- end-html-test-code -->"
        }
      ]
    },
    your_target: {
        src: 'dist/*.js'
    }
  },
})

The following configuration will remove log() statements from all .js files in the dist/ folder

grunt.initConfig({
  strip_code: {
    options: {
      patterns: /log\(\)/g
    },
    your_target: {
        src: 'dist/*.js'
    }
  },
})

The patterns property can also take arrays of RegExp objects.

grunt.initConfig({
  strip_code: {
    options: {
      patterns: [/log\(\)/g, / *console\.log\([\w\S ]+\);?\n?/g]
    },
    your_target: {
        src: 'dist/*.js'
    }
  },
})

The normal behavior is to strip out code in the source files and then save those files with the same name. If you need to save them to a different name, you can specify a dest option as well.

grunt.initConfig({
  strip_code: {
    options: { },
    your_target: {
      files: [
        {src: 'tmp/my-app.js', dest: 'dist/my-app.js'},
        {src: 'tmp/my-lib.js', dest: 'dist/my-lib.js'}
      ]
    }
  },
})
grunt.initConfig({
  strip_code: {
    strip_html_and_js_: {
      options: {
        blocks: [{
          start_block: "/* start-test-block */",
          end_block: "/* end-test-block */"
        }, {
          start_block: "<!-- start-html-test-code -->",
          end_block: "<!-- end-html-test-code -->"
        }]
      },
      src: 'src/*.html'
 
    },
    strip_php: {
      options: {
        blocks: [{
          start_block: "/* start-test-block */",
          end_block: "/* end-test-block */"
        }]
      },
      src: ['src/file1.php', 'src/file2.php']
    },
    strip_log_: {
      options: {
        patterns: /log\(\)/g
      },
      files: [{
        src: 'src/src-test.js',
        dest: 'dest/src-test.js'
      }, {
        src: 'src/src-test2.js',
        dest: 'dest/src-test2.js'
      }]
 
    }
  },
})

The following configuration will strip out code that begins with the /* start-test-block */ comment and ends with the /* end-test-block */ comment from all .js files in the dist/ folder.

grunt.initConfig({
  strip_code: {
    options: {
      start_comment: 'start-test-block',
      end_comment: 'end-test-block',
    },
    your_target: {
        src: 'dist/*.js'
    }
  },
})

The following configuration will remove log() statements from all .js files in the dist/ folder

grunt.initConfig({
  strip_code: {
    options: {
      pattern: /log\(\)/g
    },
    your_target: {
        src: 'dist/*.js'
    }
  },
})

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.

Added Coveralls.

Documentation changes.

  • Added options.blocks to take arrays of different start and end capture blocks.
  • Added flag for intersectionCheck.
  • Added flag for parityCheck.
  • Major updates to package.json.
  • Added Travis CI
  • Added backward compatibility.
  • Minor updates to package.json.
  • Fix a bug so it only overwrites a file is there was stripped code.
  • Initial Release