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tests/cases/compiler/intersectionsOfLargeUnions.ts(21,15): error TS2536: Type 'T' cannot be used to index type 'HTMLElementTagNameMap'.
tests/cases/compiler/intersectionsOfLargeUnions.ts(21,15): error TS2536: Type 'P' cannot be used to index type 'HTMLElementTagNameMap[T]'.
==== tests/cases/compiler/intersectionsOfLargeUnions.ts (2 errors) ====
// Repro from #23977
export function assertIsElement(node: Node | null): node is Element {
let nodeType = node === null ? null : node.nodeType;
return nodeType === 1;
}
export function assertNodeTagName<
T extends keyof ElementTagNameMap,
U extends ElementTagNameMap[T]>(node: Node | null, tagName: T): node is U {
if (assertIsElement(node)) {
const nodeTagName = node.tagName.toLowerCase();
return nodeTagName === tagName;
}
return false;
}
export function assertNodeProperty<
T extends keyof ElementTagNameMap,
P extends keyof ElementTagNameMap[T],
V extends HTMLElementTagNameMap[T][P]>(node: Node | null, tagName: T, prop: P, value: V) {
~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2536: Type 'T' cannot be used to index type 'HTMLElementTagNameMap'.
~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2536: Type 'P' cannot be used to index type 'HTMLElementTagNameMap[T]'.
if (assertNodeTagName(node, tagName)) {
node[prop];
}
}
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