react app

react-app/node_modules/react/lib/ReactContext.js

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+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule ReactContext
+ */
+
+'use strict';
+
+var assign = require("./Object.assign");
+var emptyObject = require("./emptyObject");
+var warning = require("./warning");
+
+var didWarn = false;
+
+/**
+ * Keeps track of the current context.
+ *
+ * The context is automatically passed down the component ownership hierarchy
+ * and is accessible via `this.context` on ReactCompositeComponents.
+ */
+var ReactContext = {
+
+  /**
+   * @internal
+   * @type {object}
+   */
+  current: emptyObject,
+
+  /**
+   * Temporarily extends the current context while executing scopedCallback.
+   *
+   * A typical use case might look like
+   *
+   *  render: function() {
+   *    var children = ReactContext.withContext({foo: 'foo'}, () => (
+   *
+   *    ));
+   *    return <div>{children}</div>;
+   *  }
+   *
+   * @param {object} newContext New context to merge into the existing context
+   * @param {function} scopedCallback Callback to run with the new context
+   * @return {ReactComponent|array<ReactComponent>}
+   */
+  withContext: function(newContext, scopedCallback) {
+    if ("production" !== process.env.NODE_ENV) {
+      ("production" !== process.env.NODE_ENV ? warning(
+        didWarn,
+        'withContext is deprecated and will be removed in a future version. ' +
+        'Use a wrapper component with getChildContext instead.'
+      ) : null);
+
+      didWarn = true;
+    }
+
+    var result;
+    var previousContext = ReactContext.current;
+    ReactContext.current = assign({}, previousContext, newContext);
+    try {
+      result = scopedCallback();
+    } finally {
+      ReactContext.current = previousContext;
+    }
+    return result;
+  }
+
+};
+
+module.exports = ReactContext;