Deploying create-react-app with webpack to heroku. Error in Loader

Looks like that the app was deployed :

Counting objects: 7, done. Delta compression using up to 8 threads. Compressing objects: 100% (7/7), done. Writing objects: 100% (7/7), 630 bytes | 0 bytes/s, done. Total 7 (delta 5), reused 0 (delta 0) remote: Compressing source files... done. remote: Building source: remote: remote: -----> Node.js app detected remote: remote: -----> Creating runtime environment remote: remote:
NPM_CONFIG_LOGLEVEL=error remote: NPM_CONFIG_PRODUCTION=true remote: NODE_VERBOSE=false remote: NODE_ENV=production remote: NODE_MODULES_CACHE=true remote: remote: -----> Installing binaries remote: engines.node (package.json): unspecified remote: engines.npm (package.json): unspecified (use default) remote: remote: Resolving node version 6.x via semver.io... remote: Downloading and installing node 6.10.2... remote: Using default npm version: 3.10.10 remote: remote: -----> Restoring cache remote: Loading 2 from cacheDirectories (default): remote: - node_modules remote:
- bower_components (not cached - skipping) remote: remote: -----> Building dependencies remote: Installing node modules (package.json) remote: remote: -----> Caching build remote:
Clearing previous node cache remote: Saving 2 cacheDirectories (default): remote: - node_modules remote: - bower_components (nothing to cache) remote: remote: -----> Build succeeded! remote: -----> Discovering process types remote:
Procfile declares types -> (none) remote: Default types for buildpack -> web remote: remote: -----> Compressing... remote:
Done: 47.8M remote: -----> Launching... remote: Released v19 remote: https://dry-depths-33506.herokuapp.com/ deployed to Heroku remote: remote: Verifying deploy... done. To https://git.heroku.com/dry-depths-33506.git 1f1dcd3..40032c0 master -> master

But then I receive this:

Error in Loader /app/node_modules/eslint/lib/api.js didn't return a function @ multi main

via Elena Volskaia