From UNICODE text to gzipped blob encoded as text and back using Apps Script

Text2GzipBlob.gs

/**
 * These two functions:
 * 1. Transform a UNICODE string to blob, compress and encode it as text using two different methods (base64 or JSON.stringify)
 * 2. Reverse de process
 */

function testTextoGzipBlob() {

  // Method 1: base64Encode (better compression):
  // Text >> Blob >> gzip >> getBytes Byte[] >> *base64Encode* text >> [cache key/value] >> *base64Decode* Byte[] >> Blob >> ungzip >> Text 😅

  let datos = '🎩Cadena de texto con eñes y tildes, ¿funcionará?⚙️';
  datos += datos + datos + datos; // Make it bigger to appreciate compression
  
  console.info(`Input text length: ${datos.length}, Blob size: ${Utilities.newBlob(datos).getBytes().length} bytes`);
  
  // In

  const blobIn = Utilities.gzip(Utilities.newBlob(datos)); 
  const textIn = Utilities.base64Encode(blobIn.getBytes());
  
  console.info(`Blob type: ${blobIn.getContentType()}, Base64 string compressed blob length: ${textIn.length}`);
  console.info(`Blob size: ${Utilities.newBlob(textIn).getBytes().length} bytes`);
  
  // Here we could store textIn in cache as text
  // <-------------->

  // Out

  const byteArrayOut = Utilities.base64Decode(textIn);
  
  // ⚠️ Blob.setContentType to "Avoid Blob object must have non-null content type for this operation"!!!!
  let blobOut = Utilities.newBlob(byteArrayOut).setContentType('application/x-gzip');
  
  blobOut = Utilities.ungzip(blobOut);
  const textOut = blobOut.getDataAsString();
  
  console.info(`Input text: '${datos},\nOutput text: ${textOut}`);

}

function testTextoGzipBlob2() {

  // Method 2: JSON.stringify
  // Text >> Blob >> gzip >> getBytes Byte[] >> *JSON.stringify* text >> [cache key/value] >> *JSON.parse* Byte[] >> Blob >> ungzip >> Text 😅
  // Also works, but resulting size is larger

  let datos = '🎩Cadena de texto con eñes y tildes, ¿funcionará?⚙️';
  datos += datos + datos + datos; // Make it bigger to appreciate compression
  
  console.info(`Input text length: ${datos.length}, Blob size: ${Utilities.newBlob(datos).getBytes().length} bytes`);

  // In

  const blobIn = Utilities.gzip(Utilities.newBlob(datos)); 
  const textIn = JSON.stringify(blobIn.getBytes());
  
  console.info(`Blob type: ${blobIn.getContentType()}, Stringified compressed blob length: ${textIn.length}`);
  console.info(`Blob size: ${Utilities.newBlob(textIn).getBytes().length} bytes`);
  
  // Here we could store textIn in cache as text
  // <-------------->

  // Out
  
  const byteArrayOut = JSON.parse(textIn);
    
  // ⚠️ Blob.setContentType to "Avoid Blob object must have non-null content type for this operation"!!!!
  let blobOut = Utilities.newBlob(byteArrayOut).setContentType('application/x-gzip');
  
  blobOut = Utilities.ungzip(blobOut);
  const textOut = blobOut.getDataAsString();
  
  console.info(`Input text: '${datos},\nOutput text: ${textOut}`);

}