63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
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/**
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* Copyright (c) 2014-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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* 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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var printWarning = function printWarning(format, args) {
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var len = arguments.length;
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args = new Array(len > 1 ? len - 1 : 0);
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for (var key = 1; key < len; key++) {
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args[key - 1] = arguments[key];
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}
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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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// --- Welcome to debugging React ---
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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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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 (!condition) {
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printWarning.apply(null, [format].concat(args));
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}
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};
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}
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module.exports = warning;
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