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Treat Array<T> and ReadonlyArray<T> as synonymous in inference

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This commit is contained in:
Anders Hejlsberg
2019-07-17 18:49:56 -07:00
parent c6b77fa5df
commit 8f020559fb
1 changed files with 2 additions and 1 deletions
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3
src/compiler/checker.ts
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@@ -15587,7 +15587,8 @@ namespace ts {
}
}
}
if (getObjectFlags(source) & ObjectFlags.Reference && getObjectFlags(target) & ObjectFlags.Reference && (<TypeReference>source).target === (<TypeReference>target).target) {
if (getObjectFlags(source) & ObjectFlags.Reference && getObjectFlags(target) & ObjectFlags.Reference && (
(<TypeReference>source).target === (<TypeReference>target).target || isArrayType(source) && isArrayType(target))) {
// If source and target are references to the same generic type, infer from type arguments
inferFromTypeArguments((<TypeReference>source).typeArguments || emptyArray, (<TypeReference>target).typeArguments || emptyArray, getVariances((<TypeReference>source).target));
}