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No typecheck errors on optional object method param #16247
Description
TypeScript Version: 2.3.4
Code
type MethodOptions = {
opt1?: string
opt2?: number
}
class Test {
method(options?: MethodOptions) {
}
}
var test = new Test();
test.method("ciao"); //there should be an error here
test.method(1); // idem
test.method([]); // idemdirectly on playground
Expected behavior:
Type checking errors
Actual behavior:
No errors
Activity
ikatyang commentedon Jun 4, 2017
In my opinion,
MethodOptionsis considered to be one of these types:{}{opt1: string}{opt2: number}{opt1: string, opt2: number}So
"ciao" | 1 | []is a validMethodOptions, since they match the type of{}.jwbay commentedon Jun 4, 2017
Duplicate of #7485, fixed by #16047