Taking a long array of integers between -1 and 1, code golfing it into base 36 and then decoding it

encodeNumberArray.js

  const encodeNumbers = (array) => {
    const chunk = (arr, len) => {
      var chunks = [],
        i = 0,
        n = arr.length;
      while (i < n) {
        chunks.push(arr.slice(i, i += len));
      }
      return chunks
    }

    return chunk(array.map(n => n+1), 33).map(num => parseInt(num.join``, 3).toString(36)).join`,`
  }
  const decodeFunc = `
    (longN) =>
    longN.split\`,\`
      .map((n) => parseInt(n, 36).toString(3).split\`\`.map((n) => n - 1))
      .flat();
  `
  const decodeNumbers = eval(decodeFunc)

  script = `const decodeNumbers = ${decodeFunc};` + script
  script = script.replaceAll(/Float32Array\((\[[\n -01,]+\])\)/gm, (_, match) => {
    const array = eval(match)
    if (array.join`` !== decodeNumbers(encodeNumbers(array)).join``) {
      throw new Error(`Number encoding not matching`)
    }
    return `Float32Array(decodeNumbers("${encodeNumbers(array)}"))`
  })