planning

node_modules/react-router/modules/MemoryRouter.js

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+import React from "react";
+import PropTypes from "prop-types";
+import { createMemoryHistory as createHistory } from "history";
+import warning from "tiny-warning";
+
+import Router from "./Router.js";
+
+/**
+ * The public API for a <Router> that stores location in memory.
+ */
+class MemoryRouter extends React.Component {
+  history = createHistory(this.props);
+
+  render() {
+    return <Router history={this.history} children={this.props.children} />;
+  }
+}
+
+if (__DEV__) {
+  MemoryRouter.propTypes = {
+    initialEntries: PropTypes.array,
+    initialIndex: PropTypes.number,
+    getUserConfirmation: PropTypes.func,
+    keyLength: PropTypes.number,
+    children: PropTypes.node
+  };
+
+  MemoryRouter.prototype.componentDidMount = function() {
+    warning(
+      !this.props.history,
+      "<MemoryRouter> ignores the history prop. To use a custom history, " +
+        "use `import { Router }` instead of `import { MemoryRouter as Router }`."
+    );
+  };
+}
+
+export default MemoryRouter;