@cypress/vite-plugin-proxify-esm

A Vite plugin that intercepts and rewrites ES module imports. It wraps them in a Proxy, allowing for instrumentation by libraries such as Sinon. Useful for test runners using Vite as a dev server.

Note: This package is a pre-release and is not yet stable. There are likely to be bugs and edge cases. Please report and bugs here

Debugging

Run Cypress with DEBUG=cypress:vite-plugin-proxify-esm. You will get logs in the terminal, for the code transformation, and in the browser console, for intercepting and wrapping the modules in a Proxy.

Compatibility

| @cypress/vite-plugin-mock-esm | cypress | | ------------------------ | ------- | | >= v1 | >= v12 |

Known Issues

This module uses a regexp based approach to transforming the modules on the server to facilicate wrapping them in a Proxy on the client. In future updates, a more robust AST based approach will be explored.

All known import syntax is supported with the exception of a default import combined with * as alias in a single line.

import defaultExport3, * as name2 from "./module";

An alterntive would simply be to split the import syntax over two lines:

import defaultExport3 from "./module";
import * as name2 from "./module";

License

This project is licensed under the terms of the MIT license.

Changelog