How to use 'scripthelpers' in JavaScript

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function getScriptFromEval(code){
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	if (!scriptCache[code]){
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		scriptCache[code] = VM.createScript(code);
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	}
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	return scriptCache[code];
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}

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function hexlifyScript(script) {
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    function hexlify(ar) {
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        var result = '';
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        for (var i = 0; i < ar.length; ++i) {
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            if (ar[i] < 16) {
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                result += '0';
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            }
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            result += ar[i].toString(16);
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        }
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        return result;
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    }
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    // add header, pad to multiple of 16 bytes
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    data = new Uint8Array(4 + script.length + (16 - (4 + script.length) % 16));
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    data[0] = 77; // 'M'
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    data[1] = 80; // 'P'
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    data[2] = script.length & 0xff;
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    data[3] = (script.length >> 8) & 0xff;
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    for (var i = 0; i < script.length; ++i) {
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        data[4 + i] = script.charCodeAt(i);
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    }
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    // TODO check data.length < 0x2000
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    // convert to .hex format
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    var addr = 0x3e000; // magic start address in flash
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    var chunk = new Uint8Array(5 + 16);
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    var output = [];
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    output.push(':020000040003F7') // extended linear address, 0x0003
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    for (var i = 0; i < data.length; i += 16, addr += 16) {
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        chunk[0] = 16; // length of data section
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        chunk[1] = (addr >> 8) & 0xff; // high byte of 16-bit addr
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        chunk[2] = addr & 0xff; // low byte of 16-bit addr
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        chunk[3] = 0; // type (data)
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        for (var j = 0; j < 16; ++j) {
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            chunk[4 + j] = data[i + j];
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        }
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        var checksum = 0;
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        for (var j = 0; j < 4 + 16; ++j) {
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            checksum += chunk[j];
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        }
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        chunk[4 + 16] = (-checksum) & 0xff;
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        output.push(':' + hexlify(chunk).toUpperCase())
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    }
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    return output.join('\n');
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}