Public class fields - Code Recipes

新版本的变更 / ES2022

// *** before: ***
class Counter {
    constructor() {
        this.count = 0;
    }
    increment() {
        this.count++;
    }
}

// *** in version ES2022: ***
class Counter {
    count = 0;
    increment() {
        this.count++;
    }
}