ngrx-rtk-query/esm2022/core/src/utils/signal-proxy.mjs

Angular RTK Query

/**
 * The code in this file is adapted from TanStack/query
 *
 * TanStack/query is an open-source project licensed under the MIT license.
 *
 * For more information about the original code, see
 * https://github.com/TanStack/query
 */
import { computed, untracked } from '@angular/core';
/**
 * Exposes fields of an object passed via an Angular `Signal` as `Computed` signals.
 *
 * Functions on the object are passed through as-is.
 *
 * @param signal - `Signal` that must return an object.
 *
 */
export function signalProxy(signal) {
    const internalState = {};
    return new Proxy(internalState, {
        get(target, prop) {
            // first check if we have it in our internal state and return it
            const computedField = target[prop];
            if (computedField)
                return computedField;
            // then, check if it's a function on the resultState and return it
            const targetField = untracked(signal)[prop];
            if (typeof targetField === 'function')
                return targetField;
            // finally, create a computed field, store it and return it
            // @ts-expect-error bypass
            return (target[prop] = computed(() => signal()[prop]));
        },
        has(_, prop) {
            return !!untracked(signal)[prop];
        },
        ownKeys() {
            return Reflect.ownKeys(untracked(signal));
        },
        getOwnPropertyDescriptor() {
            return {
                enumerable: true,
                configurable: true,
            };
        },
    });
}
export function toDeepSignal(signal) {
    const deepSignal = signalProxy(signal);
    return Object.assign(signal, deepSignal);
}
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