vinyl-sourcemaps-apply

Apply a source map to a vinyl file, merging it with preexisting source maps.

Usage:

1var applySourceMap = require('vinyl-sourcemaps-apply');
2applySourceMap(vinylFile, sourceMap);

Example (Gulp plugin):

1var through = require('through2');
2var applySourceMap = require('vinyl-sourcemaps-apply');
3var myTransform = require('myTransform');
4
5module.exports = function(options) {
6
7  function transform(file, encoding, callback) {
8    // generate source maps if plugin source-map present
9    if (file.sourceMap) {
10      options.makeSourceMaps = true;
11    }
12
13    // do normal plugin logic
14    var result = myTransform(file.contents, options);
15    file.contents = new Buffer(result.code);
16
17    // apply source map to the chain
18    if (file.sourceMap) {
19      applySourceMap(file, result.map);
20    }
21
22    this.push(file);
23    callback();
24  }
25
26  return through.obj(transform);
27};