Commits on Sep 8, 2017

1. [packager][breaking-change] Default enableBabelRCLookup (recursive) t… …

   …o false
   
   This is a breaking change that tells Metro to look at only the project's .babelrc file. Previously it would look at .babelrc files under node_modules and would run into issues because it didn't have the version of Babel nor the plugins/presets that `node_modules/randompackage/.babelrc` wanted. So as a workaround, people would write a postinstall step that deletes `node_modules/**/.babelrc`, which worked well. This flag (`getEnableBabelRCLookup = false`) has the same effect and hopefully fixes one source of cryptic bugs people run into.
   
   To use the old behavior, create a config file named `rn-cli.config.js` with:
   ```js
   module.exports = {
     getEnableBabelRCLookup() {
       return true;
     },
   };
   ```
   
   Test Plan: Go under node_modules, modify a used module to have a dummy .babelrc (`{"plugins": ["dummy"]}`) and ensure the JS bundle still loads.

   

   ide committed Sep 8, 2017
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