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To observe a class getter in Vue.js, you can use a computed property.

For example, if you have a class getter fullName in your Vue component, you can observe it using a computed property like this:

computed: {
  observeFullName() {
    return this.fullName;
  }
},
watch: {
  observeFullName(newVal, oldVal) {
    console.log('Observing fullName:', newVal, oldVal);
  }
}

In this example, observeFullName is a computed property that returns the value of fullName. The watch property then watches this computed property for changes and logs them to the console.

You can replace fullName with any class getter that you want to observe in your Vue component.