@virtualstate/app-history/esnext/app-history-entry.js

Native JavaScript [app-history](https://github.com/WICG/app-history) implementation

import { AppHistoryEventTarget } from "./app-history-event-target.js";
import { EventTargetListeners } from "./event-target/index.js";
import { v4 } from "./util/uuid-or-random.js";
export const AppHistoryEntryNavigationType = Symbol.for("@virtualstate/app-history/entry/navigationType");
export const AppHistoryEntryKnownAs = Symbol.for("@virtualstate/app-history/entry/knownAs");
export const AppHistoryEntrySetState = Symbol.for("@virtualstate/app-history/entry/setState");
export class AppHistoryEntry extends AppHistoryEventTarget {
    #index;
    #state;
    get index() {
        return typeof this.#index === "number" ? this.#index : this.#index();
    }
    key;
    id;
    url;
    sameDocument;
    get [AppHistoryEntryNavigationType]() {
        return this.#options.navigationType;
    }
    get [AppHistoryEntryKnownAs]() {
        const set = new Set(this.#options[AppHistoryEntryKnownAs]);
        set.add(this.id);
        return set;
    }
    #options;
    get [EventTargetListeners]() {
        return [...(super[EventTargetListeners] ?? []), ...(this.#options[EventTargetListeners] ?? [])];
    }
    constructor(init) {
        super();
        this.#options = init;
        this.key = init.key || v4();
        this.id = v4();
        this.url = init.url ?? undefined;
        this.#index = init.index;
        this.sameDocument = init.sameDocument ?? true;
        this.#state = init.state;
    }
    getState() {
        const state = this.#state;
        /**
         * https://github.com/WICG/app-history/blob/7c0332b30746b14863f717404402bc49e497a2b2/spec.bs#L1406
         * Note that in general, unless the state value is a primitive, entry.getState() !== entry.getState(), since a fresh copy is returned each time.
         */
        if (typeof state === "undefined" ||
            typeof state === "number" ||
            typeof state === "boolean" ||
            typeof state === "symbol" ||
            typeof state === "bigint" ||
            typeof state === "string") {
            return state;
        }
        if (typeof state === "function") {
            console.warn("State passed to appHistory.navigate was a function, this may be unintentional");
            console.warn("Unless a state value is primitive, with a standard implementation of appHistory");
            console.warn("your state value will be serialized and deserialized before this point, meaning");
            console.warn("a function would not be usable.");
        }
        return {
            ...state
        };
    }
    [AppHistoryEntrySetState](state) {
        this.#state = state;
    }
}
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