32 lines
1.2 KiB
TypeScript
32 lines
1.2 KiB
TypeScript
/*
|
|
Copyright 2022 The Matrix.org Foundation C.I.C.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
type StringifyReplacer = (this: any, key: string, value: any) => any;
|
|
|
|
// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cyclic_object_value#circular_references
|
|
// Injects `<$ cycle-trimmed $>` wherever it cuts a cyclical object relationship
|
|
export const getCircularReplacer = (): StringifyReplacer => {
|
|
const seen = new WeakSet();
|
|
return (key: string, value: any): any => {
|
|
if (typeof value === "object" && value !== null) {
|
|
if (seen.has(value)) {
|
|
return "<$ cycle-trimmed $>";
|
|
}
|
|
seen.add(value);
|
|
}
|
|
return value;
|
|
};
|
|
};
|