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diff --git a/scripts/transform-coverage.js b/scripts/transform-coverage.js
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+++ b/scripts/transform-coverage.js
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+#!/usr/bin/env node
+/**
+ * This script applies a source map to LCOV data. If you have coverage data for
+ * a concatenated file, plus a source map, this will output LCOV data for your
+ * original source files.
+ *
+ * Usage:
+ *
+ *   transform-coverage.js path/to/soure.map path/to/coverage.lcov > out.lcov
+ */
+
+// TODO: make this a command line argument
+var SOURCE = 'src/';  // only report files under this directory
+
+var assert = require('assert'),
+    fs = require('fs'),
+    lcovParse = require('lcov-parse'),
+    parseDataUri = require('parse-data-uri'),
+    sourcemap = require('source-map');
+
+var sourcemapFile = process.argv[2];
+var lcovFile = process.argv[3];
+
+var sourcemapData = fs.readFileSync(sourcemapFile).toString();
+var sourcemap = new sourcemap.SourceMapConsumer(sourcemapData);
+
+lcovParse(lcovFile, function(err, data) {
+  assert(!err);
+  // TODO: 0 --> the correct file
+  var lines = data[0].lines.details;
+
+  var fileToCov = {};  // filename -> { line num -> hits }
+
+  lines.forEach(function(line) {
+    var pos = sourcemap.originalPositionFor({line: line.line, column: 0});
+    if (pos == null) {
+      return;
+    }
+
+    var filename = pos.source;
+
+    // Test coverage of node_modules is never interesting.
+    if (!filename || filename.indexOf('node_modules') >= 0) {
+      return;
+    }
+
+    // Strip paths down to the source root.
+    var base = filename.indexOf(SOURCE);
+    if (base == -1) return;
+    filename = filename.slice(base);
+
+    if (!fileToCov[filename]) fileToCov[filename] = [];
+    fileToCov[filename][pos.line] = line.hit;
+  });
+
+  // Other LCOV fields to translate:
+  // FN:2454
+  // FNF:465
+  // FNH:410
+  // FNDA:1,(anonymous_1)
+  // LF:4570
+  // LH:4002
+  // BRDA:13,1,0,1
+  // BRF:2213
+  // BRH:1684
+
+  // Convert to LCOV format
+  for (var filename in fileToCov) {
+    var cov = fileToCov[filename]
+    console.log('SF:' + filename);
+    for (var i = 0; i < cov.length; i++) {
+      if (cov[i] != null) {
+        console.log('DA:' + i + ',' + cov[i]);
+      }
+    }
+    console.log('end_of_record');
+  }
+});