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Passing false to serialize gives typescript error #465

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MasterOdin opened this issue Jul 26, 2022 · 3 comments · May be fixed by #471
Open

Passing false to serialize gives typescript error #465

MasterOdin opened this issue Jul 26, 2022 · 3 comments · May be fixed by #471

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@MasterOdin
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MasterOdin commented Jul 26, 2022 •
edited

Looking at the Additional Options doc, it gives:

  // Whether to serialize to JSON before/after persisting. Defaults to true.
  serialize?: boolean,

but on trying to pass false, I get the tsc error:

(property) ApolloPersistOptions<NormalizedCacheObject, true>.serialize?: true | undefined
Type 'false' is not assignable to type 'true'.ts(2322)
index.d.ts(20, 5): The expected type comes from property 'serialize' which is declared here on type 'ApolloPersistOptions<NormalizedCacheObject, true>'

To get by this, I'm ignoring the error via a tsc annotation, but that definitely feels hacky and there didn't seem an obvious way to let tsc accept false.
@wodCZ
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wodCZ commented Jul 26, 2022

Hi, thanks for the report.

I guess I messed something up in the StorageType inference here:

apollo-cache-persist/src/types/index.ts

Lines 21 to 23 in eded0ff

type StorageType<T, TSerialize extends boolean> = TSerialize extends true
? PersistentStorage<string>
: PersistentStorage<T>;

Maybe providing a false branch is required:

declare type StorageType<
  T,
  TSerialize extends boolean
> = TSerialize extends true
  ? PersistentStorage<string>
  : TSerialize extends false
  ? PersistentStorage<T>
  : PersistentStorage<string>;

I'll look into this, but not sooner than by the end of the week. @MasterOdin if you by any chance try working on #464, could you check whether the change above fixes the issue?

Thanks!

@MasterOdin
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I tried, and it did not resolve the problem. I think the problem lies with:

apollo-cache-persist/src/types/index.ts

Line 27 in eded0ff

TSerialize extends boolean = true

where TS is not smart enough to see that I'm passing it false in usage and bubble that upwards appropriately, rather it's forcing true | undefined from top down. I'm not sure what the best way to resolve this would be.

@pzuraq pzuraq linked a pull request Sep 25, 2022 that will close this issue
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@pzuraq
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pzuraq commented Sep 25, 2022

👋 I made a PR over in #471 to address this, TS does need to have the explicit link downward through generics typically, otherwise it'll use the default parameter (it's like calling a function with optional params, if you don't pass in a generic, you'll always get the default).

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Add a generic parameter so TS users can use serialize: false pzuraq/apollo-cache-persist
3 participants
@pzuraq @wodCZ @MasterOdin