This demonstrates an issue of instanceof when dependencies have a major version difference.

• base is 2.0.0 in client, but 1.0.1 in server
• client depends on both base and server

instanceof will fail to detect JsError class.

Setup

Run node index.js and will see missed in console.

See also

• https://github.com/paul4156/base
• https://github.com/paul4156/server