54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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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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