Mirth 3.7.1 to 3.10.0 PolyFills

// https://github.com/behnammodi/polyfill/blob/master/array.polyfill.js

/**
 * Array.prototype.flat()
 * version 0.0.0
 * Feature            Chrome  Firefox Internet Explorer   Opera    Safari    Edge
 * Basic support      69      62      (No)                  56    12      (No)
 * -------------------------------------------------------------------------------
 */
if (!Array.prototype.flat) {
    Array.prototype.flat = function () {
        const stack = [].concat(this);
        const result = [];
        while (stack.length) {
            const next = stack.pop();
            if (Array.isArray(next)) stack.push.apply(stack, next);
            else result.push(next);
        }
        return result.reverse();
    };
}

/**
 * Array.prototype.flatMap()
 * version 0.0.0
 * Feature            Chrome  Firefox Internet Explorer   Opera    Safari    Edge
 * Basic support      69      62      (No)                  56    12      (No)
 * -------------------------------------------------------------------------------
 */
if (!Array.prototype.flatMap) {
    Array.prototype.flatMap = function () {
        return Array.prototype.map.apply(this, arguments).flat(1);
    };
}

// Based on https://github.com/FabioVergani/js-Polyfill_String-trimStart

if (!String.prototype.trimStart) {
    String.prototype.trimStart = function () {
        var str = this.valueOf()
        var r = /^\s+/
        return str.replace(r, '')
    };
}

if (!String.prototype.trimEnd) {
    String.prototype.trimEnd = function () {
        var str = this.valueOf()
        var r = /\s+$/
        return str.replace(r, '')
    };
}