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