react-addons/lib/invariant.js

Simple packaging of react addons to avoid fiddly 'react/addons' npm module.

/**
 * Copyright 2013-2014 Facebook, Inc.
 *
 * 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.
 *
 * @providesModule invariant
 */

"use strict";

/**
 * Use invariant() to assert state which your program assumes to be true.
 *
 * Provide sprintf-style format (only %s is supported) and arguments
 * to provide information about what broke and what you were
 * expecting.
 *
 * The invariant message will be stripped in production, but the invariant
 * will remain to ensure logic does not differ in production.
 */

var invariant = function(condition) {
  if (!condition) {
    var error = new Error(
      'Minified exception occured; use the non-minified dev environment for ' +
      'the full error message and additional helpful warnings.'
    );
    error.framesToPop = 1;
    throw error;
  }
};

if ("production" !== process.env.NODE_ENV) {
  invariant = function(condition, format, a, b, c, d, e, f) {
    if (format === undefined) {
      throw new Error('invariant requires an error message argument');
    }

    if (!condition) {
      var args = [a, b, c, d, e, f];
      var argIndex = 0;
      var error = new Error(
        'Invariant Violation: ' +
        format.replace(/%s/g, function() { return args[argIndex++]; })
      );
      error.framesToPop = 1; // we don't care about invariant's own frame
      throw error;
    }
  };
}

module.exports = invariant;