getParameters for func 'a => console.log(a)' error

[AimWhy]

Description

const comma = ',';
const equals = '=';
const openBrace = '{';
const openParen = '(';
const closeParen = ')';
const arrow = '=>';

const fnBodyRegex = /(([\s\S]))/;
const fnBodyStripCommentsRegex = /(/*([\s\S]?)*/|([^:]|^)//(.)$)/gm;
const fnBodyStripParamDefaultValueRegex = /\s?=.$/;

// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
export function getParameters(fn: Function): string[] {
if (typeof fn !== 'function') {
throw new Error('Not supported');
}

if (fn.length === 0) {
    return [];
}

let fnBody: string = Function.prototype.toString.call(fn);
fnBody = fnBody.replace(fnBodyStripCommentsRegex, '') || fnBody;
fnBody = fnBody.slice(0, fnBody.includes(openBrace) ? fnBody.indexOf(openBrace) : void 0);
fnBody = fnBody.slice(0, fnBody.includes(arrow) ? fnBody.indexOf(arrow) : void 0);

let open = fnBody.indexOf(openParen);
let close: number | undefined = fnBody.indexOf(closeParen);

open = open >= 0 ? open + 1 : 0;
close = close > 0 ? close : (fnBody.includes(equals) ? fnBody.indexOf(equals) : void 0);

fnBody = fnBody.slice(open, close);
fnBody = `(${fnBody})`;

const match = fnBodyRegex.exec(fnBody);
return match != null
    ? match[1].split(comma).map(param => param.trim().replace(fnBodyStripParamDefaultValueRegex, ''))
    : [];

}

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main

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