Steps to replicate the issue (include links if applicable):

• Navigate to Special:Homepage in any beta wiki, (beta eswiki)
• Observe the JS console

What happens?:
An uncaught error is thrown:

Error: Cannot require undefined file ext.growthExperiments.Homepage.Impact/index.js
    at require (startup.js:1009:11)
    at homepage.init.js:3:3
    at homepage.init.js (homepage.init.js:45:2)
    at runScript (startup.js:1282:6)
    at execute (startup.js:1403:4)
    at doPropagation (startup.js:748:6)

The error prevents the execution of some of the homepage modules JS code

What should have happened instead?:
No error should be thrown on the homepage load, all modules JS should run correctly.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):
Most probably a fallout of I049baf90a37453863354bd3e5b134866818c1604