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Add cache to `getSimplifiedConditionalType` by ahejlsberg · Pull Request #64648 · microsoft/TypeScript · GitHub

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Add cache to getSimplifiedConditionalType #64648

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Anders Hejlsberg (ahejlsberg) wants to merge 1 commit into
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Add cache to getSimplifiedConditionalType #64648

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11 changes: 11 additions & 0 deletions tsc/internal/checker/checker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,7 @@ const (
CachedTypeKindDecoratorContextStatic
CachedTypeKindDecoratorContextPrivate
CachedTypeKindDecoratorContextPrivateStatic
CachedTypeKindSimplifiedConditionalType
)

// CachedTypeKey
Expand Down Expand Up @@ -28507,6 +28508,16 @@ func (c *Checker) distributeIndexOverObjectType(objectType *Type, indexType *Typ
}

func (c *Checker) getSimplifiedConditionalType(t *Type, writing bool) *Type {
key := CachedTypeKey{kind: CachedTypeKindSimplifiedConditionalType, typeId: t.id}

Mateusz Burzyński (Andarist) Oct 6, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

regression tests for the above:

type Value<T extends { a: string; b: number }> = T["a" | "b"] extends unknown
  ? T["a" | "b"]
  : never;

function test<T extends { a: string; b: number }>(value: Value<T>, a: T["a"]) {
  const read: T["a"] | T["b"] = value;
  const write: Value<T> = a; // errors
}
if cached, ok := c.cachedTypes[key]; ok {
return cached
}
result := c.getSimplifiedConditionalTypeWorker(t, writing)
c.cachedTypes[key] = result
return result
}

func (c *Checker) getSimplifiedConditionalTypeWorker(t *Type, writing bool) *Type {
checkType := t.AsConditionalType().checkType
extendsType := t.AsConditionalType().extendsType
trueType := c.getTrueTypeFromConditionalType(t)
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