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Defer distributing index over generic object types #50540

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merged 3 commits into from Sep 1, 2022
Merged

Defer distributing index over generic object types #50540

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00e3926
Defer distributing index over generic object types
Andarist Aug 30, 2022
2ba9ff1
Only check if the index type should be deferred for intersection types
Andarist Aug 31, 2022
873dfea
Add an additional test case
Andarist Sep 1, 2022
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3 changes: 3 additions & 0 deletions src/compiler/checker.ts
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Expand Up @@ -15903,6 +15903,9 @@ namespace ts {
}

function distributeIndexOverObjectType(objectType: Type, indexType: Type, writing: boolean) {
if (shouldDeferIndexType(objectType)) {
return;
}
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Remove this.

// (T | U)[K] -> T[K] | U[K] (reading)
// (T | U)[K] -> T[K] & U[K] (writing)
// (T & U)[K] -> T[K] & U[K]
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Change the following line to:

if (objectType.flags & TypeFlags.Union || objectType.Flags & TypeFlags.Intersection && !shouldDeferIndexType(objectType)) ...

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I'm concerned that shouldDeferIndexType will also do (possibly expensive) work for union types, so I'd prefer only deferring for intersection types.

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39 changes: 39 additions & 0 deletions ...lines/reference/mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.symbols
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@@ -0,0 +1,39 @@
=== tests/cases/compiler/mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts ===
interface StateSchema {
>StateSchema : Symbol(StateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 0, 0))

states?: {
>states : Symbol(StateSchema.states, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 0, 23))

[key: string]: StateSchema;
>key : Symbol(key, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 2, 5))
>StateSchema : Symbol(StateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 0, 0))

};
}

declare class StateNode<TStateSchema extends StateSchema> {
>StateNode : Symbol(StateNode, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 4, 1))
>TStateSchema : Symbol(TStateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 6, 24))
>StateSchema : Symbol(StateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 0, 0))

schema: TStateSchema;
>schema : Symbol(StateNode.schema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 6, 59))
>TStateSchema : Symbol(TStateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 6, 24))
}

type StateNodesConfig<TStateSchema extends StateSchema> = {
>StateNodesConfig : Symbol(StateNodesConfig, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 8, 1))
>TStateSchema : Symbol(TStateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 10, 22))
>StateSchema : Symbol(StateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 0, 0))

[K in keyof TStateSchema["states"]]: StateNode<NonNullable<TStateSchema["states"]>[K]>;
>K : Symbol(K, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 11, 3))
>TStateSchema : Symbol(TStateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 10, 22))
>StateNode : Symbol(StateNode, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 4, 1))
>NonNullable : Symbol(NonNullable, Decl(lib.es5.d.ts, --, --))
>TStateSchema : Symbol(TStateSchema, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 10, 22))
>K : Symbol(K, Decl(mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts, 11, 3))

};

24 changes: 24 additions & 0 deletions ...selines/reference/mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.types
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@@ -0,0 +1,24 @@
=== tests/cases/compiler/mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts ===
interface StateSchema {
states?: {
>states : { [key: string]: StateSchema; } | undefined

[key: string]: StateSchema;
>key : string

};
}

declare class StateNode<TStateSchema extends StateSchema> {
>StateNode : StateNode<TStateSchema>

schema: TStateSchema;
>schema : TStateSchema
}

type StateNodesConfig<TStateSchema extends StateSchema> = {
>StateNodesConfig : StateNodesConfig<TStateSchema>

[K in keyof TStateSchema["states"]]: StateNode<NonNullable<TStateSchema["states"]>[K]>;
};

16 changes: 16 additions & 0 deletions tests/cases/compiler/mappedTypeOverNullableConstraintWithIndexSignatureWithNonNullable.ts
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@@ -0,0 +1,16 @@
// @noEmit: true
// @strict: true

interface StateSchema {
states?: {
[key: string]: StateSchema;
};
}

declare class StateNode<TStateSchema extends StateSchema> {
schema: TStateSchema;
}

type StateNodesConfig<TStateSchema extends StateSchema> = {
[K in keyof TStateSchema["states"]]: StateNode<NonNullable<TStateSchema["states"]>[K]>;
};