42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
// @flow
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function test(a: string, b: number): number {
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return this.length; // expect []/"" this
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}
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// args flow correctly into params
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test.call("", "", 0);
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// wrong this is an error
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test.call(0, "", 0); // error: lookup `length` on Number
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// not enough arguments is an error
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test.call("", ""); // error: void ~> number
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// mistyped arguments is an error
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test.call("", "", ""); // error: string ~> number (2nd arg)
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test.call("", 0, 0); // error: number ~> string (1st arg)
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// resolve args array from tvar
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function f(args) { test.call("", args[0], args[1]) }
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f(["", 0]); // OK
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f(["", ""]); // error: string ~> number (2nd arg)
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f([0, 0]); // error: number ~> string (1st arg)
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// expect 3 errors:
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// - lookup length on Number (0 used as `this`)
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// - number !~> string (param a)
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// - string !~> number (param b)
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(test.apply.call(test, 0, [0, 'foo']): number);
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// args are optional
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function test2(): number { return 0; }
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(test2.call(): number);
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(test2.call(""): number);
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// callable objects
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function test3(x: { (a: string, b: string): void }) {
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x.call(x, 'foo', 'bar'); // ok
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x.call(x, 'foo', 123); // error, number !~> string
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}
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