02fe840732
* Get constraint with this argument of the type parameter for comparisons * Also instantiate indexed accesses * Add much simpler test
37 lines
984 B
TypeScript
37 lines
984 B
TypeScript
interface MsgConstructor<T extends Message> {
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new(data: Array<{}>): T;
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}
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class Message {
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clone(): this {
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return this;
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}
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}
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interface MessageList<T extends Message> extends Message {
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methodOnMessageList(): T[];
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}
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function fetchMsg<V extends Message>(protoCtor: MsgConstructor<V>): V {
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return null!;
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}
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class DataProvider<T extends Message, U extends MessageList<T>> {
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constructor(
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private readonly message: MsgConstructor<T>,
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private readonly messageList: MsgConstructor<U>,
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) { }
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fetch() {
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const messageList = fetchMsg(this.messageList);
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messageList.methodOnMessageList();
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}
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}
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// The same bug as the above but using indexed accesses
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// (won't surface directly unless unsound indexed access assignments are forbidden)
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function f<
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U extends {TType: MessageList<T>},
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T extends Message
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>(message: MsgConstructor<T>, messageList: MsgConstructor<U["TType"]>) {
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fetchMsg(messageList).methodOnMessageList();
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}
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