resig.js/build/main/core/signal.js

Universal reactive signal library with complete platform features: signals, animations, CRDTs, scheduling, DOM integration. Works identically across React, SolidJS, Svelte, Vue, and Qwik.

"use strict";
/**
 * Core Signal Category - Functor implementation
 * Following category-theoretic laws for structure preservation
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.computed = exports.pure = exports.compose = exports.id = exports.signal = void 0;
/**
 * Creates a basic signal with functor laws
 * Laws verified:
 * - map(id) ≡ id (identity)
 * - map(f ∘ g) ≡ map(f) ∘ map(g) (composition)
 */
const signal = (initial) => {
    let current = initial;
    const subscribers = new Set();
    const notify = () => {
        subscribers.forEach((fn) => fn(current));
    };
    const signalInstance = {
        value: () => current,
        map: (f) => {
            // Create derived signal that follows functor laws
            const derived = (0, exports.signal)(f(current));
            // Subscribe to changes and map them
            signalInstance.subscribe((newValue) => {
                derived._set(f(newValue));
            });
            return derived;
        },
        subscribe: (fn) => {
            subscribers.add(fn);
            return () => subscribers.delete(fn);
        },
        _set: (value) => {
            if (value !== current) {
                current = value;
                notify();
            }
        },
    };
    return signalInstance;
};
exports.signal = signal;
/**
 * Identity function for functor law verification
 */
const id = (a) => a;
exports.id = id;
/**
 * Function composition for functor law verification
 */
const compose = (f, g) => (a) => f(g(a));
exports.compose = compose;
/**
 * Pure function - lifts a value into Signal context
 */
const pure = (value) => (0, exports.signal)(value);
exports.pure = pure;
/**
 * Computed signal - creates a derived signal from a computation function
 */
const computed = (compute) => {
    const computedSignal = (0, exports.signal)(compute());
    // For now, return a basic computed signal
    // In a full implementation, this would track dependencies automatically
    return computedSignal;
};
exports.computed = computed;
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