48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule invariant
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* @flow
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*/
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'use strict';
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declare var __DEV__: boolean;
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const validateFormat = __DEV__ ? function (format: mixed): void {} : function (format: mixed): void {
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if (format === undefined) {
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throw new Error('invariant(...): Second argument must be a string.');
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}
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};
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/**
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* Use invariant() to assert state which your program assumes to be true.
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*
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* Provide sprintf-style format (only %s is supported) and arguments to provide
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* information about what broke and what you were expecting.
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*
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* The invariant message will be stripped in production, but the invariant will
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* remain to ensure logic does not differ in production.
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*/
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function invariant(condition: mixed, format: string, ...args: Array<mixed>): void {
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validateFormat(format);
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if (!condition) {
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let error;
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if (format === undefined) {
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error = new Error('Minified exception occurred; use the non-minified dev environment ' + 'for the full error message and additional helpful warnings.');
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} else {
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let argIndex = 0;
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error = new Error(format.replace(/%s/g, () => String(args[argIndex++])));
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error.name = 'Invariant Violation';
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}
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(error: any).framesToPop = 1; // Skip invariant's own stack frame.
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throw error;
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}
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}
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module.exports = invariant; |