Kick off metro-core by moving the source-map generator

Reviewed By: rafeca

Differential Revision: D6448594

fbshipit-source-id: 8498ae8ff62e5afc6ae92c56b7c15cdaf8acd3a1

packages/metro-source-map/.npmignore

@@ -0,0 +1,5 @@
+**/__mocks__/**
+**/__tests__/**
+build
+src.real
+yarn.lock

packages/metro-source-map/README.md

@@ -0,0 +1,5 @@
+# Metro
+
+🚇 The source map generator for [Metro](https://facebook.github.io/metro/).
+
+(TODO)

packages/metro-source-map/package.json

@@ -0,0 +1,21 @@
+{
+  "version": "0.23.0",
+  "name": "metro-source-map",
+  "description": "🚇 Source map generator for Metro.",
+  "main": "src/source-map.js",
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:facebook/metro.git"
+  },
+  "scripts": {
+    "prepare-release": "test -d build && rm -rf src.real && mv src src.real && mv build src",
+    "cleanup-release": "test ! -e build && mv src build && mv src.real src"
+  },
+  "dependencies": {
+    "source-map": "^0.5.6"
+  },
+  "devDependencies": {
+    "babel-core": "^6.24.1",
+    "babel-generator": "^6.26.0"
+  }
+}

packages/metro-source-map/rn-babelrc.json

@@ -0,0 +1,4 @@
+{
+  "presets": [ "react-native" ],
+  "plugins": []
+}

packages/metro-source-map/src/Generator.js

@@ -14,7 +14,7 @@
 
 const B64Builder = require('./B64Builder');
 
-import type {MappingsMap} from '../../lib/SourceMap';
+import type {SourceMap as MappingsMap} from 'babel-core';
 
 /**
  * Generates a source map from raw mappings.

packages/metro-source-map/src/source-map.js

@@ -15,9 +15,10 @@
 const Generator = require('./Generator');
 const SourceMap = require('source-map');
 
-import type {MappingsMap, RawMappings} from '../../lib/SourceMap';
+import type {SourceMap as MappingsMap} from 'babel-core';
 import type {RawMapping as BabelRawMapping} from 'babel-generator';
 
+type RawMappings = Array<BabelRawMapping>;
 type GeneratedCodeMapping = [number, number];
 type SourceMapping = [number, number, number, number];
 type SourceMappingWithName = [number, number, number, number, string];

packages/metro/src/DeltaBundler/Serializers.js

@@ -17,8 +17,8 @@ const DeltaPatcher = require('./DeltaPatcher');
 const toLocalPath = require('../node-haste/lib/toLocalPath');
 
 const {getAssetData} = require('../Assets');
-const {fromRawMappings} = require('../Bundler/source-map');
 const {createRamBundleGroups} = require('../Bundler/util');
+const {fromRawMappings} = require('metro-source-map');
 
 import type {AssetData} from '../Assets';
 import type {MappingsMap} from '../lib/SourceMap';

packages/metro/src/JSTransformer/worker/index.js

@@ -24,7 +24,7 @@ const minify = require('./minify');
 const optimizeDependencies = require('../../ModuleGraph/worker/optimizeDependencies');
 const path = require('path');
 
-const {compactMapping} = require('../../Bundler/source-map');
+const {compactMapping} = require('metro-source-map');
 
 import type {LogEntry} from '../../Logger/Types';
 import type {CompactRawMappings, MappingsMap} from '../../lib/SourceMap';

packages/metro/src/Resolver/index.js

@@ -20,7 +20,7 @@ const {
   compactMapping,
   fromRawMappings,
   toRawMappings,
-} = require('../Bundler/source-map');
+} = require('metro-source-map');
 const pathJoin = require('path').join;
 
 import type Module, {HasteImpl, TransformCode} from '../node-haste/Module';

packages/metro/src/Server/symbolicate/__tests__/worker-test.js

@@ -15,7 +15,7 @@ jest.mock('net', () => ({
   createServer: () => ({listen: () => {}}),
 }));
 
-const SourceMapGenerator = require('../../../Bundler/source-map/Generator');
+const SourceMapGenerator = require('metro-source-map/src/Generator');
 const {symbolicate} = require('../worker');
 
 let connection;

packages/metro/src/legacy.js

@@ -19,7 +19,7 @@ const blacklist = require('./blacklist');
 const debug = require('debug');
 const invariant = require('fbjs/lib/invariant');
 
-const {fromRawMappings, compactMapping} = require('./Bundler/source-map');
+const {fromRawMappings, compactMapping} = require('metro-source-map');
 
 import type {ConfigT as MetroConfig} from './Config';
 import type Server from './Server';

packages/metro/src/shared/types.flow.js

@@ -11,7 +11,6 @@
  */
 'use strict';
 
-import type {RawMapping} from '../Bundler/source-map';
 import type {
   GetTransformOptions,
   PostMinifyProcess,
@@ -23,6 +22,7 @@ import type {SourceMap} from '../lib/SourceMap';
 import type {TransformCache} from '../lib/TransformCaching';
 import type {Reporter} from '../lib/reporting';
 import type {HasteImpl} from '../node-haste/Module';
+import type {RawMapping} from 'metro-source-map';
 
 type BundleType = 'bundle' | 'delta' | 'map' | 'ram' | 'cli' | 'hmr' | 'todo';
 type SourceMapOrMappings = SourceMap | Array<RawMapping>;