React-admin: Can't resolve 'ra-core' in 'ra-input-rich-text'

[despatates]

What you were expecting:

Compiling files to produce a successful production build.

What happened instead:

I get this error at compilation:

Failed to compile

./node_modules/ra-input-rich-text/esm/index.js
Module not found: Can't resolve 'ra-core' in '<path>/node_modules/ra-input-rich-text/esm'

Other information:

The compilation was successful with v2.6.1

Environment

• React-admin version: v2.6.2
• Last version that did not exhibit the issue (if applicable): v2.6.1
• React version: 16.7.0
• React-scripts version: 2.1.3

[despatates]

Same as #2800.

Some modules in node_modules were outdated, and running npm install|update didn't update them.
Deleting file package-lock.json and running npm install to generate a new one solved the problem.