drkibitz/grunt-map2map

Map one source map to another source map

grunt-map2map

Map one source map to another source map. Why would you want this? Lets say...

• Compile some Typescript to JavaScript and generate a source map
• Run compiled JavaScript through Closure Compiler and generate another source map
• Remap the source map for the obfuscated code back to the original Typescript

Before Use

• grunt-contrib-uglify already accomplishes this with its sourceMapIn option. Only use this task for cases that do not already have this functionality.
• This module does not fix any of the problems with source maps generated along with Closure Compiler's ADVANCED_OPTIMIZATIONS. With this option, Closure Compiler can rewrite source so far beyond the original version, that mapping becomes virtually impossible.

Install

npm install grunt-map2map --save-dev

Options

• sourceMappingURL: string Value to append as sourceMappingURL to generated source file
• generated: string The location of the source map to remap to original
• original: string The location of the source map that generated will remap to
• dest: string The location to save the remapped source map, defaults to generated

Example

grunt.initConfig({
	map2map: {
		options: {
			sourceMappingURL: 'main.final.js.map'
		},
		main: {
			options: {
				generated: 'bin/main.obfuscated.js.map',
				original: 'bin/main.compiled.js.map',
				dest: 'bin/main.final.js.map'
			}
		}
	}
});