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Replace 'any' with a generic in Set (Close #3337) #3338

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merged 2 commits into from
Mar 17, 2022
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Replace 'any' with a generic in Set (Close #3337) #3338

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193b21e
Replace 'any' with a generic in Set (Close #3337)
kubk Mar 17, 2022
56a2e80
Test more methods
kubk Mar 17, 2022
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Replace 'any' with a generic in Set (Close #3337)
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@kubk
kubk committed Mar 17, 2022
commit 193b21ea3b8e98eceace500f2f9a80f25e2a58cf
5 changes: 5 additions & 0 deletions .changeset/tall-seas-study.md
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@@ -0,0 +1,5 @@
---
"mobx": patch
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---

Replace any with a generic in Set methods
11 changes: 11 additions & 0 deletions packages/mobx/__tests__/v5/base/typescript-tests.ts
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Expand Up @@ -2054,6 +2054,17 @@ test("type inference of the action callback", () => {
}
})

test("TS - type inference of Set", () => {
const set = observable.set<number>()
set.add(1)
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// @ts-expect-error
set.add("1")
// @ts-expect-error
set.has("1")
// @ts-expect-error
set.delete("1")
})
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@kubk kubk Mar 17, 2022 •
edited
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A nice feature of ts-expect-error is that it throws if there is no TS error on the next line (unlike ts-ignore)


test("TS - type inference of observe & intercept functions", () => {
const array = [1, 2]
const object = { numberKey: 1, stringKey: "string" }
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4 changes: 2 additions & 2 deletions packages/mobx/src/types/observableset.ts
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Expand Up @@ -159,7 +159,7 @@ export class ObservableSet<T = any> implements Set<T>, IInterceptable<ISetWillCh
return this
}

delete(value: any) {
delete(value: T) {
if (hasInterceptors(this)) {
const change = interceptChange<ISetWillChange<T>>(this, {
type: DELETE,
Expand Down Expand Up @@ -202,7 +202,7 @@ export class ObservableSet<T = any> implements Set<T>, IInterceptable<ISetWillCh
return false
}

has(value: any) {
has(value: T) {
this.atom_.reportObserved()
return this.data_.has(this.dehanceValue_(value))
}
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