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1. andrewbranch commented on Aug 24, 2021

   

   Andrew Branch (andrewbranch)

   on Aug 24, 2021

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   Some real-world examples might be helpful here. It feels to me like TS provides 95% of what you need, and you can fake the last 5% with an as type assertion: playground. Are there severe limitations to an approach like this when brought into the real world?
2. andrewbranch commented on Aug 24, 2021

   

   Andrew Branch (andrewbranch)

   on Aug 24, 2021

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   Not exactly recommended, but here’s some hacks to make it work for plain old new Float32Array(length). I don’t think we’d ever add something like this to standard type definitions, but the fact that there are workarounds for cases like these means we’re probably less likely to add something specific to the language for it.
3. fatcerberus commented on Aug 24, 2021

   

   Bruce Pascoe (fatcerberus)

   on Aug 24, 2021

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   Not directly related to the issue, but why does the error message in that playground say "Object is possibly undefined"? I was confused for a while because I couldn't figure out why it thought v1 could be undefined. I finally realized that it actually meant v1[0] might be undefined, but there's no object type involved there - the result of the indexing is number | undefined. It should probably say "value might be undefined" instead.

   👍React with 👍1Reacted by Andrew Branch
4. Andrew Branch (andrewbranch)

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   SuggestionAn idea for TypeScriptAn idea for TypeScript

   on Aug 25, 2021
5. amw commented on Oct 1, 2021

   

   Adam Wróbel (amw)

   on Oct 1, 2021

   Last edited by amw

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   I tried to hack something like this, but it doesn't work the way I prayed it would:

   type RGBATuple = [number, number, number, number]
   type TypedRGBATuple = Uint8ClampedArray & RGBATuple
   const data = new Uint8ClampedArray(4) as TypedRGBATuple
   const color = new Color(...data)
   // produces error
   // A spread argument must either have a tuple type or be passed to a rest parameter. ts(2556)
   

   It's a bit odd since TypeScript should know that data is also a tuple.
6. GoToLoop commented on Jan 13, 2023

   

   GoToLoop (GoToLoop)

   on Jan 13, 2023

   Last edited by GoToLoop

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   I can't pass a spread TypedArray to a function! =(

   A spread argument must either have a tuple type or be passed to a rest parameter.(2556)

   import type p5 from "p5"
   
   export const ALL_COLORS = 0xff << 0o30
   
   const arr8Bit = new Uint8Array(Int32Array.BYTES_PER_ELEMENT)
   const bufView = new DataView(arr8Bit.buffer)
   
   export function colorFrom32bitTo8Bits(p: p5, c: number) {
       bufView.setInt32(0, c)
       return p.color(...arr8Bit.slice(1), arr8Bit[0])
   }
   
   export function randomColor(p: p5) {
       return colorFrom32bitTo8Bits(p, p.random(ALL_COLORS))
   }

   Can't neither coerce it to a tuple nor make TS know its length.

   https://www.TypeScriptLang.org/play?target=9#code/JYWwDg9gTgLgBDAnmApnMBWOAzKERwBEmhAUKSgB6SxwDGEAdgM7wCCAMhwPoDCA8h34AlAMpwAvHAAMlbNjgAeRTIgBmaeQYt4AQyhQAHACFg8KYxQB3OAFVgjGIbYHdiABQBJR2oBMLqDcAOmMATQAVAFFRbgAFSOFuSI5IgFlIgDlwgEpSbVY4ACMAV2wANWBrSThLGwARXRhdCut3fSNTGCCS+RQoXIpqaHhsYsY6GGAmeggAG2gAMTwQP0KzcIgTM2Z3MAAudAwAGnoDxmKQQr7suABvUjhHotKWqyDmFBhvGD93aRO6LknnAoJ9ilBGOgggx5lB3EEEe0tl1mLNgHQUO4AIzZE5IzoAbWkAF1cgBfchUGgjMYTKaQwKMAAm+F4c2guwOmBu92BoJg4MhMMWy1W602nR2YBOYCCjJZIHcnB4AiEYmy5NIQA
7. GoToLoop commented on Jan 13, 2023

   

   GoToLoop (GoToLoop)

   on Jan 13, 2023

   Last edited by GoToLoop

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   Well, as a workaround I've had to use Array destructuring assignment for the TypedArray:

   import type p5 from "p5"
   
   export const ALL_COLORS = 0xff << 0o30
   
   const arr8Bit = new Uint8Array(Int32Array.BYTES_PER_ELEMENT)
   const bufView = new DataView(arr8Bit.buffer)
   
   export function colorFrom32bitTo8Bits (p: p5, c: number) {
       bufView.setInt32(0, c)
       const [ a, r, g, b ] = arr8Bit
       return p.color(r, g, b, a)
   }
   
   export function randomColor (p: p5) {
       return colorFrom32bitTo8Bits(p, p.random(ALL_COLORS))
   }

   Not ideal though. But I can't see any fix in TS for it any time soon.

   https://www.TypeScriptLang.org/play?target=9#code/JYWwDg9gTgLgBDAnmApnMBWOAzKERwBEmhAUKSgB6SxwDGEAdgM7wCCAMhwPoDCA8h34AlAMpwAvHAAMlbNjgAeRTIgBmaeQYt4AQyhQAHACFg8KYxQB3OAFVgjGIbYHdiABQBJR2oBMLqDcAOmMATQAVAFFRbgAFSOFuSI5IgFlIgDlwgEpSbVY4ACMAV2wANWBrSThLGwARXRhdCut3fSNTGCCS+RQoXIpqaHhsYsY6GGAmeggAG2gAMTwQP0KzcIgTM2Z3MAAudAwAGnoDxmKQQr7suABvUjhHotKWqyDmFBhvGD93aRO6LknjMdHAANpwXQnKAnADmJ0KcAAutV2lsYA8nlBPsUoIx0EEGPMoO4YXB4UUTrpcgBfchUGgjMYTKb4wKMAAm+F4c2guwOmBu92B2JguPxRMWy1W602nR2YBOYCC7K5IHcnB4AiEYmytKAA