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import { DEV } from 'esm-env';
import * as w from './warnings.js';
import { get_prototype_of, is_array, object_prototype } from './utils.js';
/**
* @template T
* @param {T} value
* @returns {Snapshot<T>}
*/
export function snapshot(value) {
return clone(value, new Map());
}
/**
* @template T
* @param {T} value
* @param {Map<T, Snapshot<T>>} cloned
* @returns {Snapshot<T>}
*/
function clone(value, cloned) {
if (typeof value === 'object' && value !== null) {
const unwrapped = cloned.get(value);
if (unwrapped !== undefined) return unwrapped;
if (is_array(value)) {
const copy = /** @type {Snapshot<any>} */ ([]);
cloned.set(value, copy);
for (const element of value) {
copy.push(clone(element, cloned));
}
return copy;
}
if (get_prototype_of(value) === object_prototype) {
/** @type {Snapshot<any>} */
const copy = {};
cloned.set(value, copy);
for (var key in value) {
// @ts-expect-error
copy[key] = clone(value[key], cloned);
}
return copy;
}
if (typeof (/** @type {T & { toJSON?: any } } */ (value).toJSON) === 'function') {
return clone(/** @type {T & { toJSON(): any } } */ (value).toJSON(), cloned);
}
}
if (value instanceof EventTarget) {
// can't be cloned
return /** @type {Snapshot<T>} */ (value);
}
try {
return /** @type {Snapshot<T>} */ (structuredClone(value));
} catch (e) {
if (DEV) {
w.state_snapshot_uncloneable();
// eslint-disable-next-line no-console
console.warn(e);
}
return /** @type {Snapshot<T>} */ (value);
}
}
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