TypeScript class private field All In One

TypeScript class private field All In One

TypeScript class

class Person {
    #name: string
    constructor() {
        this.#name = 'eric'
    }
}

WeakMap

"use strict";
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
    if (kind === "m") throw new TypeError("Private method is not writable");
    if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
    if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
    return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
};
var _Person_name;
class Person {
    constructor() {
        _Person_name.set(this, void 0);
        __classPrivateFieldSet(this, _Person_name, 'eric', "f");
    }
}
_Person_name = new WeakMap();

ES6 class

class Person {
    #name: string
    constructor(name) {
        this.#name = name;
    }
}

const person = new Person('eric');

person;
// Person {#name: 'eric'}
person.name;
// undefined
person.#name;
// ❌ Uncaught SyntaxError: Private field '#name' must be declared in an enclosing class

refs

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