`codemirror-extension` example fails to build

[firai]

Description

Running jlpm run build locally in the codemirror-extension example locally results in an error with the following message:

src/index.ts:46:25 - error TS18046: 'step' is of type 'unknown'.

46       if (line.number % step === 0) {
                           ~~~~


Found 1 error in src/index.ts:46

Context

JL 4 typical extension conda/mamba/micromamba setup, i.e., same setup as binder/environment.yml in the extension template.

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