Helper script to validate sourcemaps

sourcemap-validate.js

#!/usr/bin/env node

var validate = require('sourcemap-validator'),
    fs = require('fs'),
    assert = require('assert');

var compiledSource = process.argv[2];
if (! compiledSource) {
    console.log("usage: validate.js <compiled-source.js>");
    process.exit(1);
}


var min = fs.readFileSync(compiledSource).toString();

var minLastLine = min.trim().split("\n").slice(-1)[0];
var m = minLastLine.match(/^\/\/# sourceMappingURL=(.+)$/);
var sourceMapUrl = m && m[1];
// TODO: resolve path

var map = fs.readFileSync(sourceMapUrl).toString();
var sources = JSON.parse(map).sources;
var sourcesContent = sources.reduce(function(contents, file) {
    file = file.replace(/^file:\/\//, '')
    contents[file] = fs.readFileSync(file).toString();
    return contents;
}, {});

assert.doesNotThrow(function () {
    validate(min, map, sourcesContent);
}, 'The sourcemap is not valid');