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node_modules/vinyl-sourcemaps-apply/README.md

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+# vinyl-sourcemaps-apply
+
+Apply a source map to a vinyl file, merging it with preexisting source maps.
+
+## Usage:
+
+```javascript
+var applySourceMap = require('vinyl-sourcemaps-apply');
+applySourceMap(vinylFile, sourceMap);
+```
+
+### Example (Gulp plugin):
+
+```javascript
+var through = require('through2');
+var applySourceMap = require('vinyl-sourcemaps-apply');
+var myTransform = require('myTransform');
+
+module.exports = function(options) {
+
+  function transform(file, encoding, callback) {
+    // generate source maps if plugin source-map present
+    if (file.sourceMap) {
+      options.makeSourceMaps = true;
+    }
+
+    // do normal plugin logic
+    var result = myTransform(file.contents, options);
+    file.contents = new Buffer(result.code);
+
+    // apply source map to the chain
+    if (file.sourceMap) {
+      applySourceMap(file, result.map);
+    }
+
+    this.push(file);
+    callback();
+  }
+
+  return through.obj(transform);
+};
+```