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Tweak default transformer to do some very minimal babel transformation

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Reviewed By: jeanlauliac

Differential Revision: D6711526

fbshipit-source-id: 03c6aea85fb6d13e92e458a46bf4a3db1268aa11
This commit is contained in:
Rafael Oleza 2018-01-12 07:39:46 -08:00 committed by Facebook Github Bot
parent 1cad201448
commit 81a500cd67
1 changed files with 21 additions and 4 deletions
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25
packages/metro/src/defaultTransform.js
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@ -11,10 +11,27 @@
*/
'use strict';
const babylon = require('babylon');
const babel = require('babel-core');
module.exports.transform = (file: {filename: string, src: string}) => {
const ast = babylon.parse(file.src, {sourceType: 'module'});
import type {TransformOptions} from './JSTransformer/worker';
import type {Plugins as BabelPlugins} from 'babel-core';
return {ast};
type Params = {
filename: string,
options: TransformOptions,
plugins?: BabelPlugins,
src: string,
};
module.exports.transform = ({filename, options, plugins, src}: Params) => {
const OLD_BABEL_ENV = process.env.BABEL_ENV;
process.env.BABEL_ENV = options.dev ? 'development' : 'production';
try {
const {ast} = babel.transform(src, {filename, code: false, plugins});
return {ast};
} finally {
process.env.BABEL_ENV = OLD_BABEL_ENV;
}
};