injector_evaluate_4.js

await client.Runtime.evaluate({
  expression:"process.patchListeners = require(`./toInject.js`).patchListeners", 
  includeCommandLineAPI: true, 
  returnByValue: false
});

// in the injected function, the value for `this` will be the instance of the server
await client.Runtime.callFunctionOn({
  objectId: serverInstance, 
  functionDeclaration: 'function() { process.patchListeners(this) }', 
  returnByValue: true
});
await client.Runtime.evaluate({
  expression:"delete process.patchListeners", 
  includeCommandLineAPI: true, 
  returnByValue: false
});