Convert Unicode literal to hexadecimal byte sequence

gas-unicode-hex.ts

/**
 * @summary converts unicode literal \u{<code point>} into hex byte sequence \x<byte>...
 */
const fromUnicodeToHexBytes = (unicode: string) => {
  //make bytes unsigned -128 +127 -> +256 or & 0xff -> 0 256
  return Utilities.newBlob(unicode)
    .getBytes()
    .map((bt) => `\\x${(bt & 0xff).toString(16)}`)
    .join("");
};

/**
 * @summary same thing using built-in function
 */
const toHexBytes = (unicode: string) => encodeURIComponent(unicode).replace(/%/g, "\\x");