@benev/slate/x/watch/state_tree.js

frontend web stuff

import { Slice } from "./parts/slice.js";
import { deep } from "../tools/deep/deep.js";
export class StateTree {
    #state;
    #readable;
    #onChange;
    #circularity_lock = false;
    #make_frozen_clone() {
        return deep.freeze(structuredClone(this.#state));
    }
    constructor(state, onChange = () => { }) {
        this.#state = structuredClone(state);
        this.#readable = this.#make_frozen_clone();
        this.#onChange = onChange;
    }
    get state() {
        return this.#readable;
    }
    transmute(fun) {
        if (this.#circularity_lock)
            throw new Error("circular error");
        this.#circularity_lock = true;
        this.#state = fun(structuredClone(this.#state));
        this.#readable = this.#make_frozen_clone();
        this.#onChange();
        this.#circularity_lock = false;
    }
    slice({ getter, setter }) {
        return new Slice({
            parent: this,
            getter,
            setter,
        });
    }
}
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