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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 65x 65x 65x 65x 65x 65x 1x 1x 65x 2x 2x 2x 2x 2x 2x 2x 2x 2x 65x 65x 65x 2x 2x 2x 2x 2x 2x 2x 2x 2x 303x 303x 124x 124x 119x 124x 73x 73x 73x 73x 187x 187x 73x 73x 73x 46x 124x 41x 41x 41x 41x 41x 50x 50x 50x 41x 41x 41x 5x 16x 2x 2x 3x 14x 1x 1x 1x 1x 1x 1x 1x 124x 181x 303x 181x 181x 181x 303x 111x 111x 111x 111x 111x 111x 303x | /** @import { Snapshot } from './types' */
import { DEV } from 'esm-env';
import * as w from './warnings.js';
import { get_prototype_of, is_array, object_prototype } from './utils.js';
/**
* In dev, we keep track of which properties could not be cloned. In prod
* we don't bother, but we keep a dummy array around so that the
* signature stays the same
* @type {string[]}
*/
const empty = [];
/**
* @template T
* @param {T} value
* @returns {Snapshot<T>}
*/
export function snapshot(value) {
if (DEV) {
/** @type {string[]} */
const paths = [];
const copy = clone(value, new Map(), '', paths);
if (paths.length === 1 && paths[0] === '') {
// value could not be cloned
w.state_snapshot_uncloneable();
} else if (paths.length > 0) {
// some properties could not be cloned
const slice = paths.length > 10 ? paths.slice(0, 7) : paths.slice(0, 10);
const excess = paths.length - slice.length;
let uncloned = slice.map((path) => `- <value>${path}`).join('\n');
if (excess > 0) uncloned += `\n- ...and ${excess} more`;
w.state_snapshot_uncloneable(uncloned);
}
return copy;
}
return clone(value, new Map(), '', empty);
}
/**
* @template T
* @param {T} value
* @param {Map<T, Snapshot<T>>} cloned
* @param {string} path
* @param {string[]} paths
* @returns {Snapshot<T>}
*/
function clone(value, cloned, path, paths) {
if (typeof value === 'object' && value !== null) {
const unwrapped = cloned.get(value);
if (unwrapped !== undefined) return unwrapped;
if (is_array(value)) {
const copy = /** @type {Snapshot<any>} */ ([]);
cloned.set(value, copy);
for (let i = 0; i < value.length; i += 1) {
copy.push(clone(value[i], cloned, DEV ? `${path}[${i}]` : path, paths));
}
return copy;
}
if (get_prototype_of(value) === object_prototype) {
/** @type {Snapshot<any>} */
const copy = {};
cloned.set(value, copy);
for (var key in value) {
// @ts-expect-error
copy[key] = clone(value[key], cloned, DEV ? `${path}.${key}` : path, paths);
}
return copy;
}
if (value instanceof Date) {
return /** @type {Snapshot<T>} */ (structuredClone(value));
}
if (typeof (/** @type {T & { toJSON?: any } } */ (value).toJSON) === 'function') {
return clone(
/** @type {T & { toJSON(): any } } */ (value).toJSON(),
cloned,
DEV ? `${path}.toJSON()` : path,
paths
);
}
}
if (value instanceof EventTarget) {
// can't be cloned
return /** @type {Snapshot<T>} */ (value);
}
try {
return /** @type {Snapshot<T>} */ (structuredClone(value));
} catch (e) {
if (DEV) {
paths.push(path);
}
return /** @type {Snapshot<T>} */ (value);
}
}
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