Make typescript aware that a function initializes a field

Question

I have the following class declared:

class MyClass {
 private myValue!: string

 constructor(){
   this.mySettingFunction()
 }

 public mySettingFunction(){
   // do stuff
   this.myValue = 'something'
 }
}

In this class, I'm using the definite assignment assertion(!) on myValue to tell typescript that the value will be initialized despite it not being able to "understand" it.

However, I was guessing, is there a way to tell typescript that mySettingFunction will initialize myValue? (Like an annotation or something similar that allows me to remove the ! from myValue)

Answer 1

What about these two options?

1.

class MyClass {
 private myValue: string | undefined = undefined;

 constructor(){
   this.mySettingFunction();
 }

 public mySettingFunction(){
   // do stuff
   this.myValue = 'something';
 }
}

class MyClass {
 private myValue = '';

 constructor(){
   this.mySettingFunction()
 }

 public mySettingFunction(){
   // do stuff
   this.myValue = 'something'
 }
}