Typescript: Expected 1-3 arguments, but got 2

[andy-ms]

TypeScript Version: 2.6.0-dev.20171015

Code

declare function f(x: number): number;
declare function f(x: number, y: number, z: number): number;

f(1, 2);

Expected behavior:

Expected 1 or 3 arguments, but got 2.

Actual behavior:

src/a.ts(4,1): error TS2554: Expected 1-3 arguments, but got 2.

[lmcarreiro]

But what if it was:

declare function f(x: number): number;
declare function f(x: number, y: number, z: number): number;
declare function f(x: number, y: number, z: number, a: number): number;
declare function f(x: number, y: number, z: number, a: number, b: number): number;
...
declare function f(x: number, y: number, z: number, a: number, b: number, ...): number;

f(1, 2);

The message would be Expected 1 or 3 or 4 or 5 or ... or N arguments, but got 2. ???

[andy-ms]

Based on existing error messages, it would be ideal to say Expected 1 or at least 3 arguments, but got 2..
Of course, doing this in a localizable way without defining too many different diagnostics will be more difficult; might be better to use commas instead of or (except for the last one) so that the template would be Expected {0} or at least {1} arguments and fill in {0} with a comma-separated list if necessary.

[DanielRosenwasser]

Consider something like No overload expects {0} arguments. The most likely overloads that match expect either {1} arguments or at least {2} arguments.

[andy-ms]

@DanielRosenwasser Good, assuming that "most likely" would mean the next lowest and next highest numbers of arguments. So if overloads accepted 1, 2, or 5 arguments and you provide 3 or 4, say "2 or 5".

[DanielRosenwasser]

Yup, that's what I should've been explicit about, thanks for clarifying. 😃

[sandersn]

Note that this has occurred at least once in real code: DefinitelyTyped/DefinitelyTyped#19119.

[gusdecool]

this also happened on https://www.npmjs.com/package/@types/urijs library when we are calling addQuery() with 2 arguments

import * as URI from 'urijs';

const path = new URI(`/some-url`);
path.addQuery('pickUpCoordinate', 'foo-query'); // this will throw TS2554 expected 1 argument but got 2 arguments

[sandersn]

That's because addQuery only expects 1 argument:

    interface URI {
        absoluteTo(path: string): URI;
        absoluteTo(path: URI): URI;
        addFragment(fragment: string): URI;
        addQuery(qry: string): URI;
        addQuery(qry: Object): URI;
        // ......

Maybe @types/urijs needs to be updated.

[NaridaL]

Very similar issue:

// lib ArrayConstructor sig for reference
interface ArrayConstructor {
    from<T>(iterable: Iterable<T> | ArrayLike<T>): T[];
    from<T, U>(iterable: Iterable<T> | ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[];
}

// [ts] Expected 1-3 arguments, but got 1.
Array.from<number, number>([1, 2, 3])

[jakearchibald]

I ran into this too: https://goo.gl/ufcpDP.

[durjoy28]

Error TS2554, expected argument 2 but got 1.
How I can solve it?
sign(myForm){
if(myForm.valid){
this.af.auth.createUserWithEmailAndPassword({
email:this.email,
password:this.password
}).then(
(success)=> {
console.log(success);
this.router.navigate(['/login'])
}).catch(
(err)=> {
console.log(err);
this.error=err;
})

[andy-ms]

@durjoy That probably depends on the library you're using. Look for a help forum for that -- it's probably not a bug in the compiler.

[shubhamyugtia001]

this only happens when you build the project.
for serve, project run smoothly.
there should be reason behind this at all for giving number of argument in a function
ERROR in src\app\component\crm\smslist\list\list.component.html(11,19): : Expected 1 arguments, but got 2.

[DanielRosenwasser]

This isn't a support forum and if you think you've found a bug you should file that separately.