Error message TS2345: "Recurse function annotates elements of argument object"

Question

Error message TS2345: "Recurse function annotates elements of argument object"

I'm working on a Typescript function that can take a variable number of arguments and access them using the arguments object:

function processArguments(): string {
    const result: Array<string> = [];

    for (const arg of arguments) {

        const argType = typeof arg;

        if (argType === 'string' || argType === 'number') {
            result.push(arg.toString());
        } else if (Array.isArray(arg)) {
            if (arg.length) {
                const inner = processArguments.apply(null, arg);
                result.push(inner);
            }
        }
    }
    
    return result.join(' ');
}

When I try to use

const inner = processArguments.apply(null, arg);

, I encounter this error:

TS2345: Argument of type 'any[]' is not assignable to parameter of type '[]'. Target allows only 0 element(s) but source may have more.

I understand the error message, but I'm unsure of how to fix or properly annotate it. Any assistance would be greatly appreciated.

typescript types

Answer 1

Answer №1

After encountering a challenge, I managed to find a solution by choosing a more direct method instead of relying on the arguments object. Here's how I tackled the issue:

type barArguments = Array<number | string | barArguments>;

function bar(...args: barArguments): string {
    const output: Array<string> = [];

    for (const arg of args) {
        const argType = typeof arg;

        if (argType === 'string' || argType === 'number') {
            output.push(arg.toString());
        } else if (Array.isArray(arg)) {
            if (arg.length) {
                const innerResult = bar.apply(null, arg);
                output.push(innerResult);
            }
        }
    }

    return output.join(' ');
}

Although I found this workaround effective, I am still curious about utilizing the arguments object in typescript. If there are any insights on this, I would appreciate learning more.

Answer 2

After encountering a challenge, I managed to find a solution by choosing a more direct method instead of relying on the arguments object. Here's how I tackled the issue:

type barArguments = Array<number | string | barArguments>;

function bar(...args: barArguments): string {
    const output: Array<string> = [];

    for (const arg of args) {
        const argType = typeof arg;

        if (argType === 'string' || argType === 'number') {
            output.push(arg.toString());
        } else if (Array.isArray(arg)) {
            if (arg.length) {
                const innerResult = bar.apply(null, arg);
                output.push(innerResult);
            }
        }
    }

    return output.join(' ');
}

Although I found this workaround effective, I am still curious about utilizing the arguments object in typescript. If there are any insights on this, I would appreciate learning more.

Error message TS2345: "Recurse function annotates elements of argument object"

Answer №1

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