Issue
When my build runs, the build fails and I run into an error that looks something like this:
ERROR in EACCES: permission denied, open '/tmp/build_xxx/node_modules/@angular/core/__ivy_ngcc__/fesm5/core.js'
This could surface as permission errors when node modules are trying to open, copy, or modify files during the build.
Resolution
If you are setting npm version in package.json, make sure the version is >= 6.11.3. There was a bug with npm ci that would break the file permissions of the modules installed.
Fix: https://github.com/npm/cli/pull/243
If you don't have npm set, use the package.json to set the version to >= 6.11.3. Docs here: https://devcenter.heroku.com/articles/nodejs-support#specifying-an-npm-version