Steps for validating the correct number of parameters passed to a function

Currently, I am developing a program with TypeScript and TSLint serving as the linter. Below is my preferred list of rules found in tslint.json:

{
    "extends": "tslint:recommended",

    "rules": {
        "comment-format": [false, "check-space"],
        "eofline": false,
        "triple-equals": [false, "allow-null-check"],
        "no-trailing-whitespace": false,
        "one-line": false,
        "no-empty": false,
        "typedef-whitespace": false,
        "whitespace": false,
        "radix": false,
        "no-consecutive-blank-lines": false,
        "no-console": false,
        "typedef": [true,
            "variable-declaration",
            "call-signature",
            "parameter",
            "property-declaration",
            "member-variable-declaration"
        ],
        "quotemark": false,
        "no-any": true,
        "one-variable-per-declaration": false
    }

}

Despite utilizing TSLint, it fails to identify incorrect function calls with the wrong number of parameters. For instance, consider the following function:

let displayTimer: Function = function(): void {
    document.getElementById('milliseconds').innerHTML = ms.toString();
    document.getElementById('seconds').innerHTML = seconds.toString();
    document.getElementById('minutes').innerHTML= minutes.toString();
};

Within another function, I invoke it in this manner:

let turnTimerOn: Function = function(): void {

    ms += interval;

    if (ms >= 1000)
    {
        ms = 0;
        seconds += 1;
    }

    if (seconds >= 60)
    {
        ms = 0;
        seconds = 0;
        minutes += 1;
    }

    displayTimer(1);
};

It's evident that a parameter is being passed to the displayTimer function (in this case, the number 1), yet the linter does not report this as an issue.

Answer №1

To ensure TypeScript checks the signature, simply eliminate the Function type:

let displayTimer = function(): void {
    // ...
};

displayTimer(1); // Error: Supplied parameters does not match any signature of call target

The inferred type of displayTimer is now () => void, not Function.

Check out the code in the PlayGround.

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