How to process output of a i2c sensor to get proper values.

I am trying to read from a i2c connect sensor. I managed to get my schematic and code working for arduino leonardo but not when I interface with the puck. I suck at bytes and low level stuff, so I am wondering if I understand what I am doing.

var i2c = new I2C();
i2c.setup({ scl : D31, sda: D30 });
const TMP117_Address = '0x48';
const Temp_Reg = '0x00';

setInterval(() => {
  i2c.writeTo(TMP117_Address, Temp_Reg);
  let a = i2c.writeTo(TMP117_Address, 1);
  
  setTimeout(() => {
    let b = i2c.readFrom(TMP117_Address, 2);
    console.log(b);
    let datac = ((b[0] << 8) | b[1]); 
    console.log(datac*0.0078125);
  }, 500);
}, 2000);

trying to imitate this:

/*********************** Read Temperature Sensor Function **************************/
double ReadTempSensor(void){
     
  // Data array to store 2-bytes from I2C line
  uint8_t data[2]; 
  // Combination of 2-byte data into 16-bit data
  int16_t datac;   

  // Points to device & begins transmission
  Wire.beginTransmission(TMP117_Address); 
  // Points to temperature register to read/write data
  Wire.write(Temp_Reg); 
  // Ends data transfer and transmits data from register
  Wire.endTransmission(); 

  // Delay to allow sufficient conversion time
  delay(10); 

  // Requests 2-byte temperature data from device
  Wire.requestFrom(TMP117_Address,2); 

  // Checks if data received matches the requested 2-bytes
  if(Wire.available() <= 2){  
    // Stores each byte of data from temperature register
    data[0] = Wire.read(); 
    data[1] = Wire.read(); 

    // Combines data to make 16-bit binary number
    datac = ((data[0] << 8) | data[1]); 

    // Convert to Celcius (7.8125 mC resolution) and return
    return datac*0.0078125; 
    
  }
}

i am getting a senseless value, i wonder what am I doing wrong? I find it hard to understand how to map these i2c operations to the pucks i2c api.