svelte/packages/svelte/src/internal/client/dev/assign.js

import * as w from '../warnings.js';
import { sanitize_location } from './location.js';

/**
 *
 * @param {any} a
 * @param {any} b
 * @param {string} property
 * @param {string} location
 */
function compare(a, b, property, location) {
	if (a !== b) {
		w.assignment_value_stale(property, /** @type {string} */ (sanitize_location(location)));
	}

	return a;
}

/**
 * @param {any} object
 * @param {string} property
 * @param {any} value
 * @param {string} location
 */
export function assign(object, property, value, location) {
	return compare((object[property] = value), object[property], property, location);
}

/**
 * @param {any} object
 * @param {string} property
 * @param {any} value
 * @param {string} location
 */
export function assign_and(object, property, value, location) {
	return compare((object[property] &&= value), object[property], property, location);
}

/**
 * @param {any} object
 * @param {string} property
 * @param {any} value
 * @param {string} location
 */
export function assign_or(object, property, value, location) {
	return compare((object[property] ||= value), object[property], property, location);
}

/**
 * @param {any} object
 * @param {string} property
 * @param {any} value
 * @param {string} location
 */
export function assign_nullish(object, property, value, location) {
	return compare((object[property] ??= value), object[property], property, location);
}