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51 lines
1.4 KiB
51 lines
1.4 KiB
/** |
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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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'use strict'; |
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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 |
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* to provide information about what broke and what you were |
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* expecting. |
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* |
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* The invariant message will be stripped in production, but the invariant |
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* will remain to ensure logic does not differ in production. |
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*/ |
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var NODE_ENV = process.env.NODE_ENV; |
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var invariant = function(condition, format, a, b, c, d, e, f) { |
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if (NODE_ENV !== 'production') { |
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if (format === undefined) { |
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throw new Error('invariant requires an error message argument'); |
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} |
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} |
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if (!condition) { |
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var error; |
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if (format === undefined) { |
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error = new Error( |
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'Minified exception occurred; use the non-minified dev environment ' + |
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'for the full error message and additional helpful warnings.' |
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); |
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} else { |
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var args = [a, b, c, d, e, f]; |
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var argIndex = 0; |
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error = new Error( |
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format.replace(/%s/g, function() { return args[argIndex++]; }) |
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); |
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error.name = 'Invariant Violation'; |
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} |
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error.framesToPop = 1; // we don't care about invariant's own frame |
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throw error; |
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} |
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}; |
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module.exports = invariant;
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