Obviously this is a guess without a code snippet, but looking at what
fetch.js looked like at the time, the
undefined value whose
fetch property we can't read is the variable
self (see line 1), which was meant to be set to the
this context (see line 466).
Therefore, it seems that
fetch.js is expecting to run in an environment where
this refers to the
jest-expo, being a testing tool, is running it in some other environment, probably in strict mode where
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