Make header value possibly undefined #927
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Since the index signature previously claimed that the value was always `Buffer | string` it means that Typescript would build even when accessing a header key that isn't guaranteed to be there, and thus crash at runtime unless a null-check is in place. Fixes #924.
tulios
approved these changes
Oct 16, 2020
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Previously this would cause a runtime crash if accessing a header that doesn't exist.
Fixes #924.