How can I create custom Babel plugins?

How can I create custom Babel plugins?

Creating custom Babel plugins involves writing a function that transforms your code. You can start by using the Babel plugin API.

What are some common use cases for custom Babel plugins?

Common use cases include code transformation, syntax support, and optimizing code for specific environments.

Can you show me a simple example of a Babel plugin?

Sure! Here's a basic example that replaces all instances of 'foo' with 'bar':

module.exports = function({ types: t }) {
  return {
    visitor: {
      Identifier(path) {
        if (path.node.name === 'foo') {
          path.node.name = 'bar';
        }
      }
    }
  };
};

How do I test my custom Babel plugin?

You can test your Babel plugin using Jest or Mocha by writing unit tests that check the transformation results.