Provides a simple function to get the arguments of a function

getArgs.js

function getArgs(func) {
    /**
     * Basic function regex
     *  - /^function\s*\w*\(([\w\W]*?)\)\s*{/
     *
     * Arrow function regex
     *  - /^([^()]*)\s*=>/
     *  - /^\(([\w\W]*?)\)\s*=>/
    * */
    
    if (typeof func !== 'function') {
        throw new TypeError(
            'Function expected, recieved: "' + typeof func + '"'
        );
    }
    
    // First match everything inside the function argument parens.
    func = func.toString();
    
    const args = (
        // Try default functions
        func.match(/^function\s*\w*\(([\w\W]*?)\)\s*{/) ||
        // Try single arg arrows
        func.match(/^([^()]*)\s*=>/) ||
        // Try multiple args arrows
        func.match(/^\(([\w\W]*?)\)\s*=>/)
    )[1];
    
    return args
        // Remove comments
        .replace(/\/\*.*?\*\//g, '')
        // Remove excess space
        .replace(/\s+/g, ' ')
        // Into arguments
        .split(',')
        // Remove assertions
        .map(arg => arg.split('=').shift().trim())
        // Remove false positive args
        .filter(arg => arg);
}