Cannot resolve module when using --watch flag

[rmartins90]

I'm using moduleNameMapper property on jest.conf.js to define alias to match the same as webpack, jest works when I run entire suite npm run unit but when I use --watch flag (or -o) process hangs with message Determining test suites to run.... I've discovered that this happens because jest can't resolve alias paths.

[eddyerburgh]

Thanks for the bug report.

Looks like this is a Jest issue—jestjs/jest#4883

Could you try going to node_modules/jest-resolve/build/index.js, and adding console.error(error) before every line that says throw error?