Buffer() is deprecated

[ooker777]

When running express-test.js I get this error:

(node:23872) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
(Use `Code --trace-deprecation ...` to show where the warning was created)

Searching everywhere in the directory there is no buffer() at all, except in package-lock.json. The dependencies are safe-buffer and safer-buffer. Do you have any idea? This Stack Overflow question about the error doesn't seem to provide any solution.