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Using Enzyme with Browserify

If you are using a test runner that runs code in a browser-based environment, you may be using browserify in order to bundle your React code.

Browserify uses static analysis to create a dependency graph at build-time of your source code to build a bundle. Enzyme has a hand full of conditional require() calls in it in order to remain compatible with React 0.13 and React 0.14.

Unfortunately, these conditional requires mean there is a bit of extra setup with bundlers like browserify.

In your browserify configuration, you simply need to make sure that the following files are labeled as "external", which means they will be ignored:

react/addons
react/lib/ReactContext
react/lib/ExecutionEnvironment

Here is an example piece of configuration code marking these as external:

var browserify = require('browserify');

var b = browserify();

// make sure to mark these as external!
b.external('react/addons');
b.external('react/lib/ReactContext');
b.external('react/lib/ExecutionEnvironment');

// the rest of your browserify configuration

React 0.14 Compatibility

If you are using React 0.14, the instructions above will be the same but with a different list of externals:

react-dom
react-dom/server
react-addons-test-utils

Example Projects