lookup function throws The "options.lookup" property must be of type function. Received type string in 4.49.0

[blemoine]

I recently migrated from dd-trace 4.29 to 4.49
I'm using node 22.11.0.

This code:

const ddtrace = require('dd-trace');
const dns = require("node:dns");
const tracer = ddtrace.init({
    serviceName: 'my-service',
    lookup: (...args) => {
        console.log('LOOKUP CALLED');
        return dns.lookup(...args)
    },
    hostname: 'whaafldjslkfds.com',

});


function main() {
    tracer.trace('trace', () => {
            console.log(`TRACED`);
        }
    );
    setTimeout(() => {
        console.log('Time to send the request to the agent')
    }, 2000)
}

main();

Is working and displaying LOOKUP CALLED in 4.29.0, but is throwing
TypeError [ERR_INVALID_ARG_TYPE]: The "options.lookup" property must be of type function. Received type string ('(...args) => {

In 4.49.0

If I should guess the culprit, I'd say this line: lookup is not a string, it's a function.

Edit:
confirming that replacing the above line by this._setValue(opts, 'lookup', options.lookup) solves the problem

[tlhunter]

I believe this was fixed in this release of the tracer: #5067

Note that the v4.x version of the tracer has reached End of Life since the bug was fixed. Can you upgrade to a recent v5.x version of the tracer and see if this fixes it for you?