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source-map-index-generator

Generate source-maps from index mappings.

Getting Started

Install the module with: npm install source-map-index-generator

// Load in SourceMapIndexGenerator
var SourceMapIndexGenerator = require('source-map-index-generator');

// Data output by node-jsmin2
var input = [
      '// First line comment',
      'var test = {',
      '  a: "b"',
      '};'
    ].join('\n'),
    output = 'var test={a:"b"};',
    srcFile = 'input.js',
    coordmap = {"22":0,"23":1,"24":2,"25":3,"26":4,"27":5,"28":6,"29":7,"31":8,"33":9,"37":10,"38":11,"40":12,"41":13,"42":14,"44":15,"45":16};

// Generate source map via SourceMapIndexGenerator
var generator = new SourceMapIndexGenerator(generatorProps);

// Add the index coordinate mapping
generator.addIndexMapping({
  src: srcFile,
  input: input,
  output: output,
  map: coordmap
});

// Collect our source-map
generator.toString(); // {"version":3,"file":"min.js","sources":["input.js"],"names":[],"mappings":"AACA,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAE,CAAE,CACT,CAAC,CAAE,CAAC,CAAC,CACP,CAAC"}

Documentation

This module returns a constructor for SourceMapIndexGenerator.

new SourceMapIndexGenerator(startOfSourceMap)

To create a new one, you must pass an object with the following properties:

file: The filename of the generated source that this source map is associated with.
sourceRoot: An optional root for all relative URLs in this source map.

SourceMapIndexGenerator.prototype.addIndexMapping(mapping)

Add code with an index based mapping to the file collection.

The mapping object should have the following properties:

src: Filepath to original src.
input: Unminified JavaScript.
output: Minified JavaScript.
map: Map of character index to character index (number -> number)
lineOffset: An optional line offset to add to mappings.

Contributing

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.

README.md