opentelemetry-js/doc/frequently-asked-questions.md

Frequently Asked Questions

This FAQ has bits of advice and workarounds for common problems.

I'm using Jest and get import errors when I run my test suite

Test suite failures of the form:

Cannot find module @opentelemetry/foo/bar from @opentelemetry/...

but package @opentelemetry/foo is installed may occur with Jest < v29.4. This is because older versions of jest-resolve cannot find the nested module imports used by some OpenTelemetry packages since version 0.56 and higher. See #5618

Either upgrade to a newer version of Jest to resolve the issue, or use this workaround for older versions of Jest by adding a moduleNameMapper rule. Add this line to your jest.config.js:

module.exports = {
  moduleNameMapper: {
    '^@opentelemetry/([^/]+)/(.+)$': '<rootDir>/node_modules/@opentelemetry/$1/build/src/index-$2',
  }
}