create_ownership_validator() — svelte Function Reference

Source Code

packages/svelte/src/internal/client/dev/ownership.js lines 16–66

export function create_ownership_validator(props) {
	const component = component_context?.function;
	const parent = component_context?.p?.function;

	return {
		/**
		 * @param {string} prop
		 * @param {any[]} path
		 * @param {any} result
		 * @param {number} line
		 * @param {number} column
		 */
		mutation: (prop, path, result, line, column) => {
			const name = path[0];
			if (is_bound_or_unset(props, name) || !parent) {
				return result;
			}

			/** @type {any} */
			let value = props;

			for (let i = 0; i < path.length - 1; i++) {
				value = value[path[i]];
				if (!value?.[STATE_SYMBOL]) {
					return result;
				}
			}

			const location = sanitize_location(`${component[FILENAME]}:${line}:${column}`);

			w.ownership_invalid_mutation(name, location, prop, parent[FILENAME]);

			return result;
		},
		/**
		 * @param {any} key
		 * @param {any} child_component
		 * @param {() => any} value
		 */
		binding: (key, child_component, value) => {
			if (!is_bound_or_unset(props, key) && parent && value()?.[STATE_SYMBOL]) {
				w.ownership_invalid_binding(
					component[FILENAME],
					key,
					child_component[FILENAME],
					parent[FILENAME]
				);
			}
		}
	};
}