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| 1 | +/*! ***************************************************************************** |
| 2 | +Copyright (c) Microsoft Corporation. All rights reserved. |
| 3 | +Licensed under the Apache License, Version 2.0 (the "License"); you may not use |
| 4 | +this file except in compliance with the License. You may obtain a copy of the |
| 5 | +License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | +
|
| 7 | +THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 8 | +KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED |
| 9 | +WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, |
| 10 | +MERCHANTABLITY OR NON-INFRINGEMENT. |
| 11 | +
|
| 12 | +See the Apache Version 2.0 License for specific language governing permissions |
| 13 | +and limitations under the License. |
| 14 | +***************************************************************************** */ |
| 15 | + |
| 16 | + |
| 17 | + |
| 18 | +/// <reference no-default-lib="true"/> |
| 19 | + |
| 20 | + |
| 21 | +interface WeakRef<T extends object> { |
| 22 | + readonly [Symbol.toStringTag]: "WeakRef"; |
| 23 | + |
| 24 | + /** |
| 25 | + * Returns the WeakRef instance's target object, or undefined if the target object has been |
| 26 | + * reclaimed. |
| 27 | + */ |
| 28 | + deref(): T | undefined; |
| 29 | +} |
| 30 | + |
| 31 | +interface WeakRefConstructor { |
| 32 | + readonly prototype: WeakRef<any>; |
| 33 | + |
| 34 | + /** |
| 35 | + * Creates a WeakRef instance for the given target object. |
| 36 | + * @param target The target object for the WeakRef instance. |
| 37 | + */ |
| 38 | + new<T extends object>(target: T): WeakRef<T>; |
| 39 | +} |
| 40 | + |
| 41 | +declare var WeakRef: WeakRefConstructor; |
| 42 | + |
| 43 | +interface FinalizationRegistry<T> { |
| 44 | + readonly [Symbol.toStringTag]: "FinalizationRegistry"; |
| 45 | + |
| 46 | + /** |
| 47 | + * Registers an object with the registry. |
| 48 | + * @param target The target object to register. |
| 49 | + * @param heldValue The value to pass to the finalizer for this object. This cannot be the |
| 50 | + * target object. |
| 51 | + * @param unregisterToken The token to pass to the unregister method to unregister the target |
| 52 | + * object. If provided (and not undefined), this must be an object. If not provided, the target |
| 53 | + * cannot be unregistered. |
| 54 | + */ |
| 55 | + register(target: object, heldValue: T, unregisterToken?: object): void; |
| 56 | + |
| 57 | + /** |
| 58 | + * Unregisters an object from the registry. |
| 59 | + * @param unregisterToken The token that was used as the unregisterToken argument when calling |
| 60 | + * register to register the target object. |
| 61 | + */ |
| 62 | + unregister(unregisterToken: object): void; |
| 63 | +} |
| 64 | + |
| 65 | +interface FinalizationRegistryConstructor { |
| 66 | + readonly prototype: FinalizationRegistry<any>; |
| 67 | + |
| 68 | + /** |
| 69 | + * Creates a finalization registry with an associated cleanup callback |
| 70 | + * @param cleanupCallback The callback to call after an object in the registry has been reclaimed. |
| 71 | + */ |
| 72 | + new<T>(cleanupCallback: (heldValue: T) => void): FinalizationRegistry<T>; |
| 73 | +} |
| 74 | + |
| 75 | +declare var FinalizationRegistry: FinalizationRegistryConstructor; |
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