bits-ui/dist/internal/state-machine.js

The headless components for Svelte.

import { box } from "svelte-toolbelt";
export class StateMachine {
    state;
    #machine;
    constructor(initialState, machine) {
        this.state = box(initialState);
        this.#machine = machine;
        this.dispatch = this.dispatch.bind(this);
    }
    #reducer(event) {
        // @ts-expect-error  state.current is keyof M
        const nextState = this.#machine[this.state.current][event];
        return nextState ?? this.state.current;
    }
    dispatch(event) {
        this.state.current = this.#reducer(event);
    }
}