@naturalcycles/js-lib/dist/web.js

Standard library for universal (browser + Node.js) javascript

/// <reference lib="es2023" preserve="true" />
/// <reference lib="dom" preserve="true" />
/**
 * Implements WebStorage API by using in-memory storage.
 * Can be useful in SSR environment or unit tests.
 *
 * This is how localStorage can be mocked in Node:
 *
 * Object.assign(globalThis, {
 *  localStorage: new InMemoryWebStorage(),
 * })
 *
 * @experimental
 */
export class InMemoryWebStorage {
    data;
    constructor(data = {}) {
        this.data = data;
    }
    // Not implementing "free property access" now for simplicity,
    // but can be implemented with Proxy
    // [ name: string ]: any
    getItem(key) {
        return this.data[key] ?? null;
    }
    setItem(key, value) {
        this.data[key] = String(value);
    }
    removeItem(key) {
        delete this.data[key];
    }
    key(index) {
        return Object.keys(this.data)[index] ?? null;
    }
    clear() {
        this.data = {};
    }
    get length() {
        return Object.keys(this.data).length;
    }
}