Error [ERR_METHOD_NOT_IMPLEMENTED]: The resolveSync() method is not implemented

[sibelius]

Describe the bug

Error [ERR_METHOD_NOT_IMPLEMENTED]: The resolveSync() method is not implemented
at Hooks.resolveSync (node:internal/modules/esm/hooks:323:11)
at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:737:35)
at ModuleLoader.resolveSync (node:internal/modules/esm/loader:762:52)
at #cachedResolveSync (node:internal/modules/esm/loader:723:25)
at ModuleLoader.getModuleJobForRequire (node:internal/modules/esm/loader:451:50)
at new ModuleJobSync (node:internal/modules/esm/module_job:379:34)
at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:424:11)
at loadESMFromCJS (node:internal/modules/cjs/loader:1561:24)
at Module._compile (node:internal/modules/cjs/loader:1712:5)
at Object..js (node:internal/modules/cjs/loader:1895:10) {
code: 'ERR_METHOD_NOT_IMPLEMENTED'
}

To Reproduce

try esm pure package

"type": "module"

Expected behavior

it should work

Environment (please complete the following information)

• OS: [e.g. Linux]: linux
• Node.js version: 22
• APM Server version:
• Agent version: 4.13.0

How are you starting the agent? (please tick one of the boxes)

• Calling agent.start() directly (e.g. require('elastic-apm-node').start(...))
• Requiring elastic-apm-node/start from within the source code
• Starting node with -r elastic-apm-node/start

Additional context

it started breaking

{
  "log.level": "debug",
  "@timestamp": "2025-07-01T18:04:05.295Z",
  "log.logger": "elastic-apm-node",
  "ecs.version": "8.10.0",
  "error": {
    "type": "Error",
    "message": "The resolveSync() method is not implemented",
    "stack_trace": "Error [ERR_METHOD_NOT_IMPLEMENTED]: The resolveSync() method is not implemented\n    at Hooks.resolveSync (node:internal/modules/esm/hooks:323:11)\n    at #resolveAndMaybeBlockOnLoaderThread (node:internal/modules/esm/loader:737:35)\n    at ModuleLoader.resolveSync (node:internal/modules/esm/loader:762:52)\n    at #cachedResolveSync (node:internal/modules/esm/loader:723:25)\n    at ModuleLoader.getModuleJobForRequire (node:internal/modules/esm/loader:451:50)\n    at new ModuleJobSync (node:internal/modules/esm/module_job:379:34)\n    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:424:11)\n    at loadESMFromCJS (node:internal/modules/cjs/loader:1561:24)\n    at Module._compile (node:internal/modules/cjs/loader:1712:5)\n    at Object..js (node:internal/modules/cjs/loader:1895:10)"
  },
  "message": "Elastic APM caught unhandled exception"
}

Agent config options:

Click to expand

replace this line with your agent config options

package.json dependencies:

Click to expand

replace this line with your dependencies section from package.json

[sibelius]

fixed moving from -r to --import?