Variable is not declare but still it is considered a private variable

Tell us what’s happening:
Describe your issue in detail here.
I have not declared the variable


but still when I first use it without declaring. It does not throw an error.
Your code so far

// Only change code below this line
class Thermostat{

get temperature(){
  return this._cel;
set temperature(f){
// Only change code above this line

const thermos = new Thermostat(76); // Setting in Fahrenheit scale
let temp = thermos.temperature; // 24.44 in Celsius
thermos.temperature = 26;
temp = thermos.temperature; // 26 in Celsius
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Challenge: Use getters and setters to Control Access to an Object

Link to the challenge:

the variable _cel does not exist, you are using this._cel, which is a property on Thermostat instances
If I do this I can access its value:

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