require("expose?libraryName!./file.js");
// Exposes the exports for file.js to the global context on property "libraryName".
// In web browsers, window.libraryName is then available.This line works to expose React to the web browser to enable the Chrome React devtools:
require("expose?React!react");
Thus, window.React is then available to the Chrome React devtools extension.
Alternately, you can set this in your config file:
loaders: [
{ test: require.resolve("react"), loader: "expose?React" }
]
The require.resolve is a node.js call (unrelated to require.resolve in webpack
processing -- check the node.js docs instead). require.resolve gives you the
absolute path to the module ("/.../app/node_modules/react/react.js"). So the
expose only applies to the react module. And it's only exposed when used in the
bundle.