| 13 | * @returns {T} |
| 14 | */ |
| 15 | export function hydratable(key, fn) { |
| 16 | if (!async_mode_flag) { |
| 17 | e.experimental_async_required('hydratable'); |
| 18 | } |
| 19 | |
| 20 | const { hydratable } = get_render_context(); |
| 21 | |
| 22 | let entry = hydratable.lookup.get(key); |
| 23 | |
| 24 | if (entry !== undefined) { |
| 25 | if (DEV) { |
| 26 | const comparison = compare(key, entry, encode(key, fn())); |
| 27 | comparison.catch(() => {}); |
| 28 | hydratable.comparisons.push(comparison); |
| 29 | } |
| 30 | |
| 31 | return /** @type {T} */ (entry.value); |
| 32 | } |
| 33 | |
| 34 | const value = fn(); |
| 35 | |
| 36 | entry = encode(key, value, hydratable.unresolved_promises); |
| 37 | hydratable.lookup.set(key, entry); |
| 38 | |
| 39 | return value; |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * @param {string} key |