Martin Konicek 6bee16a63d Use Yarn if available ...

Summary:
**Motivation**

If the project is using yarn to manage its dependencies, we should be running 'yarn add' to upgrade the React Native dependency, rather than 'npm install'.

**Test plan (required)**

Running in a project that's in a bad state:

    Error: react-native version in "package.json" (0.29.2) doesn't match the installed version in "node_modules" (0.38.0).
    Try running "yarn" to fix this.

Removed yarn.lock file, ran again:

    Error: react-native version in "package.json" (0.29.2) doesn't match the installed version in "node_modules" (0.38.0).
    Try running "npm install" to fix this.

Running inside a folder that doesn't contain a `package.json` file:

    Error: Unable to find "/Users/mkonicek/Zero29App/package.json" or "/Users/mkonicek/Zero29App/node_modules/react-native/package.json". Make sure you ran "yarn" and that you are inside a React Native project.

Removed yarn.lock file, ran again:

    Error: Unable to find "/Users/mkonicek/Zero29App/package.json" or "/Users/
Closes https://github.com/facebook/react-native/pull/11225

Differential Revision: D4261102

Pulled By: mkonicek

fbshipit-source-id: b44ae91fe46f2c81b14616ca2868cc171692c895

2016-12-02 00:13:32 -08:00

..

checks.js

Use Yarn if available

2016-12-02 00:13:32 -08:00

cli.js

New upgrading process, relying on Git

2016-11-28 08:28:35 -08:00

cliEntry.js

Use Yarn if available

2016-12-02 00:13:32 -08:00

index.js

Use Yarn if available

2016-12-02 00:13:32 -08:00

package.json

New upgrading process, relying on Git

2016-11-28 08:28:35 -08:00

yarn.js

Use Yarn if available

2016-12-02 00:13:32 -08:00