strip-regexp-loader

A webpack loader that strips code block using RegExp.

For example, this loader can be used to strip out blocks of the following pattern:

//>>debugStart
function onlyOnDebugMode() {
  console.log('Debug on');
  ...
}
//>>debugEnd

Installation

Install the loader with npm.

npm install strip-regexp-loader --save-dev

Use Case

Use it when you need to remove block of code. For example, on production environment remove some functions used only on development.

Example

webpack 1

module: {
    preLoaders: [
        {
                test: /\.js$/,
                loader: 'strip-regexp-loader'
        }
    ]
},
'strip-regexp-loader': {
  stripRegexp: {
    debug: true,
    custom: '[\\t ]*\\/\\/----start[\\s\\S]*?\\/\\/----end\\s*;?\\s*\\n?'
  }
}

webpack 2+

module: {
  rules: [{
    test: /\.js$/,
    enforce: 'pre',
    use: [{
      loader: 'strip-regexp-loader',
      options: {
        stripRegexp: {
          debug: true,
          custom: '[\\t ]*\\/\\/----start[\\s\\S]*?\\/\\/----end\\s*;?\\s*\\n?'
        }
      }
    }]
  }]
}

Options

You can pass options to the loader using the options property.

The following options are supported:

• stripRegexp: Object with pre-defined RegExps or custom RegExp.

Supported names:

• debug: strip out all blocks beginning with //>>debugStart and ending with //>>debugEnd
• html: strip out all blocks beginning with <!-- and ending with -->
• custom: strip out all blocks that match the RegExp passed as value

For example, the following would strip out all blocks beginning with //>>debugStart and ending with //>>debugEnd and all JS // comments:

module: {
  rules: [{
    test: /\.js$/,
    enforce: 'pre',
    use: [{
      loader: 'strip-regexp-loader',
      options: {
        stripRegexp: {
          debug: true,
          custom: '^[\\t ]*\\/\\/[\\s\\S]*?\\n?'
        }
      }
    }]
  }]
}