28 lines
1.2 KiB
TypeScript
28 lines
1.2 KiB
TypeScript
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// @strict: true
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interface ListItem<TData> {
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prev: ListItem<TData> | null;
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next: ListItem<TData> | null;
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data: TData;
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}
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type IteratorFn<TData, TResult, TContext = List<TData>> = (this: TContext, item: TData, node: ListItem<TData>, list: List<TData>) => TResult;
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type FilterFn<TData, TResult extends TData, TContext = List<TData>> = (this: TContext, item: TData, node: ListItem<TData>, list: List<TData>) => item is TResult;
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declare class List<TData> {
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filter<TContext, TResult extends TData>(fn: FilterFn<TData, TResult, TContext>, context: TContext): List<TResult>;
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filter<TResult extends TData>(fn: FilterFn<TData, TResult>): List<TResult>;
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filter<TContext>(fn: IteratorFn<TData, boolean, TContext>, context: TContext): List<TData>;
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filter(fn: IteratorFn<TData, boolean>): List<TData>;
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}
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interface Test {
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a: string;
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}
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const list2 = new List<Test | null>();
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const filter1 = list2.filter(function(item, node, list): item is Test {
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this.b; // $ExpectType string
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item; // $ExpectType Test | null
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node; // $ExpectType ListItem<Test | null>
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list; // $ExpectType List<Test | null>
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return !!item;
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}, {b: 'c'});
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const x: List<Test> = filter1; // $ExpectType List<Test>
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