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`JSNumber` type to support `long long` type in Web API IDL

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
javascript, swift, wasm
Domain
api, web-dev

Research direction

Start by reviewing JSKit's handling of Web API IDL long long values and compare the AudioData, Blob, and File properties mentioned in the issue with wasm-bindgen issue 800. Done would require a decided representation for JavaScript numbers, along with tests confirming whether these properties support BigInt; no implementation file or test is named.

Written by the indexing model from the issue text.

Description

enhancement

Rust folks have a similar issue, where long long shouldn't be mapped to Int64, which is bridged to BigInt on JS side. https://github.com/rustwasm/wasm-bindgen/issues/800

Checked a few other places where long long is used, like AudioData, Blob, and File and all of them return a JS number in corresponding properties, not BigInt. I'm 95% sure none of these support BigInt, remaining 5% certainty could be added by writing actual tests. I personally vote for either keeping these Int32 as proposed, or creating a new union type. Just riffing:

enum JSNumber: ExpressibleByIntegerLiteral, ExpressibleByFloatLiteral {
case integer(Int32)
case float(Double)
// ...
}

Should we add such type to JSKit then?

cc @kateinoigakukun

Originally posted by @MaxDesiatov in https://github.com/swiftwasm/WebAPIKit/issues/42#issuecomment-1125355976

Dominant language
Swift
Stars
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Forks
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Avg merge
21h 11m
Merged PRs (30d)
4

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