Default to node_modules/.cache for cacheDirectory

[hzoo]

Noticed when debugging facebook/create-react-app#1179?

my suggestion is using https://github.com/avajs/find-cache-dir

const findCacheDir = require('find-cache-dir');

findCacheDir({name: 'unicorns'});
//=> '/user/path/node-modules/.cache/unicorns'

We added it to babel-loader via babel/babel-loader#301 although later a fallback to os babel/babel-loader#318

[thymikee]

@hzoo I wonder if this is related – #2141? Looks like it would solve the issue with permissions.

[thymikee]

Hmm, I'd prefer not to make this change. We used to store the cache inside of node_modules/jest/.haste_cache and we had a ton of problems, like watchman would crawl this and then get out of sync and a ton of other tools at FB on all codebases would go mad with this. It should be easy to set "cacheDirectory": "/node_modules/.cache/jest" or something
~ @cpojer

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