65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
/* regression tests */
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function rest_array<T>(...xs: Array<T>): T { // Ok, arrays can be rest params
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return xs[0];
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}
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function rest_tuple<T>(...xs: [T]): T { // Ok, tuples can be rest params
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return xs[0];
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}
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function rest_ro_array<T>(...xs: $ReadOnlyArray<T>): T { // Ok
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return xs[0];
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}
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function rest_any(...xs: any): any { // Ok, any can be a rest param
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return xs[0];
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}
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function rest_t<U, T: Array<U>>(...xs: T): U { // Ok, bounded targ can be rest
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return xs[0];
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}
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// These are ok bounds for the rest param
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function unbound_rest_t<T>(...xs: T): void {}
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function mixed_rest_t<T: mixed>(...xs: T): void {}
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function array_rest_t<T: Array<mixed>>(...xs: T): void {}
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function roarray_rest_t<T: $ReadOnlyArray<mixed>>(...xs: T): void {}
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function iterable_rest_t<T: Iterable<mixed>>(...xs: T): void {}
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function empty_rest_t<T: empty>(...xs: T): void {}
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function bounds_on_bounds<T>() {
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return function<U: T>(...xs: T): void {}
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}
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// These are bad bounds for the rest param
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function bad_unbound_rest_t<T>(...xs: T): T {
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return xs.pop(); // Error - no bound on T
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}
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function string_rest_t<T: string>(...xs: T): void {} // Error - rest param can't be a string
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function empty_rest_t<T: empty>(...xs: T): void {} // Error - rest param can't be empty
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type Rest = Array<string>;
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function rest_alias(...xs: Rest): void {} // Ok
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function rest_union(...xs: [1,2] | Array<number>): number { // OK
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return xs[0];
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}
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function rest_intersection(...xs: { x: number } & [1,2]): number { // OK
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return xs[0] + xs.x;
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}
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function empty_rest<T:Array<mixed>>(...xs: T): T { return xs; }
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(empty_rest(): empty); // Error Array ~> empty
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function return_rest_param<Args:Array<mixed>>(
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f: (...args: Args) => void,
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): (...args: Args) => number {
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return function(...args) {
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return args; // Error: Array ~> number
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}
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}
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function requires_first_param(x: number, ...rest: Array<number>): void {}
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requires_first_param(); // Error: missing first arg
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