some code disappeared when build project

[Dedicatus546]

Describe the bug

i use @elastic/apm-rum-vue , and use its export function ApmVuePlugin

import { createApp } from 'vue'
import App from './App.vue'

import { ApmVuePlugin } from "@elastic/apm-rum-vue";

const app = createApp(App);
app.use(ApmVuePlugin);

app.mount('#app')

and then i build project

but the function patchEventTarget in file named event-target-patch.js is not build into the dist file.

source file in @elastic/apm-rum-core/dist/es/common/patching/index.js

function patchAll() {
  if (!alreadyPatched) {
    alreadyPatched = true;
    patchXMLHttpRequest(function (event, task) {
      patchEventHandler.send(XMLHTTPREQUEST, [event, task]);
    });
    patchFetch(function (event, task) {
      patchEventHandler.send(FETCH, [event, task]);
    });
    patchHistory(function (event, task) {
      patchEventHandler.send(HISTORY, [event, task]);
    });
    patchEventTarget(function (event, task) {
      patchEventHandler.send(EVENT_TARGET, [event, task]);
    });
  }

  return patchEventHandler;
}

dist file index.xxxxxx.js (build.minify = false)

function patchAll() {
  if (!alreadyPatched) {
    alreadyPatched = true;
    patchXMLHttpRequest(function(event, task) {
      patchEventHandler.send(XMLHTTPREQUEST, [event, task]);
    });
    patchFetch(function(event, task) {
      patchEventHandler.send(FETCH, [event, task]);
    });
    patchHistory(function(event, task) {
      patchEventHandler.send(HISTORY, [event, task]);
    });
    // patchEventTarget disappeared ...
  }
  return patchEventHandler;
}

but when i add a console.log() , build it again and function patchEventTarget is exist in dist file...

add console.log in @elastic/apm-rum-core/dist/es/common/patching/index.js

function patchAll() {
  if (!alreadyPatched) {
    alreadyPatched = true;
    patchXMLHttpRequest(function (event, task) {
      patchEventHandler.send(XMLHTTPREQUEST, [event, task]);
    });
    patchFetch(function (event, task) {
      patchEventHandler.send(FETCH, [event, task]);
    });
    patchHistory(function (event, task) {
      patchEventHandler.send(HISTORY, [event, task]);
    });
    // add a console to read patchEventTarget
    console.log(patchEventTarget);
    patchEventTarget(function (event, task) {
      patchEventHandler.send(EVENT_TARGET, [event, task]);
    });
  }

  return patchEventHandler;
}

or add console.log in @elastic/apm-rum-core/dist/es/common/patching/event-target-patch.js

export function patchEventTarget(callback) {
  if (!window.EventTarget) {
    return;
  }
  
  // add a console
  console.log('hello');

  var proto = window.EventTarget.prototype;
  var nativeAddEventListener = proto[ADD_EVENT_LISTENER_STR];
  var nativeRemoveEventListener = proto[REMOVE_EVENT_LISTENER_STR];

  // other code 
}

last i set the build.rollupOptions.treeshake = false to solve problem.

it seems that function patchEventTarget is regarded as something which can be treeshake...

Reproduction

https://github.com/Dedicatus546/vite-build-lack-code-demo

System Info

System:
    OS: Windows 10 10.0.22581
    CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
    Memory: 6.26 GB / 15.92 GB
  Binaries:
    Node: 16.13.1 - D:\nodejs\node.EXE
    npm: 8.1.2 - D:\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.22581.100.0), Chromium (99.0.1150.55)
    Internet Explorer: 11.0.22581.1
  npmPackages:
    @vitejs/plugin-vue: ^2.2.2 => 2.3.1
    vite: ^2.8.4 => 2.9.0

Used Package Manager

pnpm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

https://stackblitz.com/edit/node-e5wfch?file=src/main.js
It was reproducible without vite. Looks like it is a bug of rollup or the library. (not sure which)

Maybe something around sideEffect: false is the reason?
https://github.com/elastic/apm-agent-rum-js/blob/41654e4b835e599343ef00fef725980095e03948/packages/rum-core/package.json#L9
No it was not. I removed sideEffect: false and tried but it did not change.
Now I feel it is a bug around rollup.

[sapphi-red]

upstream issue: rollup/rollup#4468

[Dedicatus546]

rollup fix this bug, please up rollup version to 2.72.0.

[sapphi-red]

Closing as it is updated by #8074. It will be released as 3.0.0-beta.0 in future.