Add File / FileReader polyfill#169

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bkaradzic-microsoft merged 13 commits into

BabylonJS:mainfrom

bkaradzic-microsoft:weekend/tpc-1582-file-polyfill

Jun 5, 2026

Commits on Jun 4, 2026

Add File / FileReader polyfill

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fix(File): revert to `throw Napi::TypeError`; comment-out throw test on Chakra

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review(File): drop readAsBinaryString, File extends Blob, drop shared_ptr trick

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fix(File): JSC prototype-chain wire-up via temp-instance trick

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File: try direct setPrototypeOf first, fall back to temp-instance

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File: do prototype-chain wire-up in JS so JSC errors stay caught

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File polyfill: address non-controversial review nits from bghgary on #169

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File polyfill: drop JS_PROTOTYPE_CHAIN_SHIM workaround now that #177 landed

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File: drop #177 historical paragraph from setPrototypeOf comment

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FileReader: back readonly + on* attributes with C++ state via InstanceAccessor

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FileReader: encode data: URLs via base-n instead of a bespoke base64 impl

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FileReader: box result/error so string results survive real N-API

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FileReader: anchor in-flight read via lambda-owned ref, not a self-cycle

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