react-native/local-cli/bundle/output/unbundle/build-unbundle-sourcemap-with-metadata.js
David Aurelio 5b5a89aefa Add sourcemap support for asset-based random access bundles
Summary:This adds support for source maps that can be used for “random access modules” / “unbundles”

- source maps contain an extra custom field: `x_facebook_offsets`
- this field maps module IDs to line offsets
- the source map is built as if all files were concatenated

Decoding/symbolication works as follows:
- when decoding a stack trace, and a stack frame comes from a filename that contains only numbers and ends with `.js`, look up the additionally needed line offset in the offset map and add it to the original line of the stack frame.
- consume the source map as usual

Reviewed By: martinbigio

Differential Revision: D3072426

fb-gh-sync-id: 827e6dc13b1959f02903baafa7f9e4fc2e0d4bb9
shipit-source-id: 827e6dc13b1959f02903baafa7f9e4fc2e0d4bb9
2016-03-21 12:32:22 -07:00

23 lines
675 B
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
'use strict';
const {combineSourceMaps} = require('./util');
module.exports = ({startupModules, modules}) => {
const startupModule = {
code: startupModules.map(m => m.code).join('\n'),
map: combineSourceMaps({modules: startupModules}),
};
return combineSourceMaps({
modules: [startupModule].concat(modules),
withCustomOffsets: true,
});
};