73 lines
1.2 KiB
JavaScript
73 lines
1.2 KiB
JavaScript
// @noflow
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function id<X>(x: X): X { return x; }
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/////////////////////////
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// primitive annotations
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/////////////////////////
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function check_prim(_: number | string) { }
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// ok
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check_prim("");
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// ...even when they "flow" in
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check_prim(id(""));
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//////////////////////////////
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// class instance annotations
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//////////////////////////////
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class C { }
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class D { }
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function check_inst(_: C | D) { }
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// ok
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check_inst(new D);
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// ...even when they "flow" in
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check_inst(id(new C));
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////////////////////////
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// function annotations
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////////////////////////
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function check_fun(_: ((_: number) => number) | ((_: string) => string)) { }
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// help!
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check_fun((x) => x);
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//////////////////////
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// object annotations
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//////////////////////
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function check_obj(_: { x: number } | { x: string }) { }
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// ok
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check_obj({ x: "" });
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// help!
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check_obj({ x: id("") });
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/////////////////////
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// array annotations
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/////////////////////
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function check_arr(_: number[] | string[]) { }
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// ok
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check_arr([""]);
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// help!
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check_arr([id("")]);
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//////////////////////////////////////
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// generic class instance annotations
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//////////////////////////////////////
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class P<X> { }
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function check_poly_inst(_: P<number> | P<string>) { }
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// help!
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check_poly_inst(new P);
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