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Update array/tuple relationship checking

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Anders Hejlsberg committed 2019-01-15 14:44:38 -08:00
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commit db840f41c5
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src/compiler/checker.ts
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@@ -12622,7 +12622,7 @@ namespace ts {
errorInfo = saveErrorInfo;
}
}
else if (isTupleType(source) && isArrayType(target) || isArrayType(source) && isReadonlyArrayType(target)) {
else if (isReadonlyArrayType(target) ? isArrayType(source) || isTupleType(source) : isArrayType(target) && isTupleType(source) && !source.target.readonly) {
return isRelatedTo(getIndexTypeOfType(source, IndexKind.Number) || anyType, getIndexTypeOfType(target, IndexKind.Number) || anyType, reportErrors);
}
// Even if relationship doesn't hold for unions, intersections, or generic type references,