fix: check type before using string-only method #2393
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pieh
commented
Dec 8, 2023
MarcL
previously approved these changes
Dec 8, 2023
MarcL
approved these changes
Dec 8, 2023
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Description
Our override of
fs/promises->readFileassumes that first argument is astring.readFiledoes accept multiple types - includingURLthat is used by Node.js itself (https://github.com/nodejs/node/blob/8cdb7cae98468efee222727ad9a4096e415f3ef6/lib/internal/modules/esm/load.js#L44-L46) when loading ESM module.This adds typeguard to prevent trying to use
.startsWithif argument is not a string. As we only care here about specific context ofreadFileusage - this continues to use a string, so we don't have to try to handle all the possible types thatreadFileaccept and only need to handle actual types used in that context. If type is not string, we will do passthrough to originalfs/promises.readFilefunctionDocumentation
Tests
You can test this change yourself like so:
Relevant links (GitHub issues, etc.) or a picture of cute animal
https://answers.netlify.com/t/all-nextjs-builds-returning-500-error-with-typeerror-file-startswith-is-not-a-function/107758/10