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62 lines
1.8 KiB
62 lines
1.8 KiB
/** |
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* Copyright 2014-2015, 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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* Similar to invariant but only logs a warning if the condition is not met. |
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* This can be used to log issues in development environments in critical |
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* paths. Removing the logging code for production environments will keep the |
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* same logic and follow the same code paths. |
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*/ |
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var __DEV__ = process.env.NODE_ENV !== 'production'; |
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var warning = function() {}; |
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if (__DEV__) { |
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warning = function(condition, format, args) { |
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var len = arguments.length; |
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args = new Array(len > 2 ? len - 2 : 0); |
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for (var key = 2; key < len; key++) { |
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args[key - 2] = arguments[key]; |
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} |
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if (format === undefined) { |
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throw new Error( |
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'`warning(condition, format, ...args)` requires a warning ' + |
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'message argument' |
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); |
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} |
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if (format.length < 10 || (/^[s\W]*$/).test(format)) { |
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throw new Error( |
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'The warning format should be able to uniquely identify this ' + |
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'warning. Please, use a more descriptive format than: ' + format |
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); |
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} |
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if (!condition) { |
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var argIndex = 0; |
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var message = 'Warning: ' + |
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format.replace(/%s/g, function() { |
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return args[argIndex++]; |
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}); |
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if (typeof console !== 'undefined') { |
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console.error(message); |
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} |
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try { |
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// This error was thrown as a convenience so that you can use this stack |
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// to find the callsite that caused this warning to fire. |
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throw new Error(message); |
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} catch(x) {} |
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} |
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}; |
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} |
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module.exports = warning;
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