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frontend/lib/src/util/assertNever.ts
29 строк
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Ken McGrady
Update copyright header to 2026 (#13491)
02 янв 2026, 16:21
Не верифицирован
02 янв 2026, 16:21
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/** * Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2026) * * 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. */ /** * Asserts that a given value is of type `never`. This function is useful for * ensuring exhaustive checks in TypeScript. If the function is called, it * throws an error indicating that a non-exhaustive branch was reached. * * @param {never} x - The value that should be of type `never`. * @throws {Error} Throws an error if a non-exhaustive branch is reached. * @returns {never} This function never returns a value. */ export const assertNever = (x: never): never => { // eslint-disable-next-line @typescript-eslint/restrict-template-expressions throw new Error(`Reached a branch with non-exhaustive item: ${x}`) }