49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
function test(a: string, b: number): number {
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return this.length; // expect []/"" this
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}
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// tuples flow correctly into params
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test.apply("", ["", 0]);
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// wrong this is an error
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test.apply(0, ["", 0]); // error: lookup `length` on Number
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// not enough arguments is an error
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test.apply("", [""]); // error: void ~> number
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// mistyped arguments is an error
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test.apply("", ["", ""]); // error: string ~> number (2nd arg)
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test.apply("", [0, 0]); // error: number ~> string (1st arg)
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// resolve args array from tvar
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function f(args) { test.apply("", args) }
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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 array
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test.apply("", "not array"); // error: expect array of args
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// expect 4 errors:
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// - lookup length on Number (because 0 is used as `this`)
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// - 123 is not a string
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// - 'foo' is not a number
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// - return type (number) is not void
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(test.call.apply(test, [0, 123, 'foo']): void);
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// expect 2 errors:
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// - lookup length on number (0 is used as `this`)
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// - 123 is not a string
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(test.bind.apply(test, [0, 123]): (b: number) => number);
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// args are optional
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function test2(): number { return 0; }
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(test2.apply(): number);
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(test2.apply(""): number);
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// callable objects
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function test3(x: { (a: string, b: string): void }) {
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x.apply(x, ['foo', 'bar']); // ok
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x.apply(x, ['foo', 123]); // error, number !~> string
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}
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