replace instanceof in brand checks with isPrototypeOf #3692
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Uzlopak
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Oct 7, 2024
| const headersToBrandCheck = globalThis.Headers | ||
| ? [Headers, globalThis.Headers] | ||
| : [Headers] | ||
| const brandChecks = webidl.brandCheckMultiple([Headers, globalThis.Headers].filter(Boolean)) |
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What if you run node with --no-experimental-fetch? Then globalThis.Headers will be undefined. Thus breaking the code.
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that's what the .filter(Boolean) is for
metcoder95
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Oct 7, 2024
Uzlopak
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Oct 7, 2024
mcollina
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@mcollina I don't think this is semver-major? |
flakey5
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Oct 8, 2024
* replace instanceof in brand checks with isPrototypeOf * fix types
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As a side note, but not majorly important: isPrototypeOf is also resilient against Symbol.hasInstance shenanigans. The real benefit is needing less imports to perform brand checks now that it is unified.