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Esbuild: plugin throws a warning when the entry point doesn't have a default export #25885
Description
Environment
node: 23.9.0esbuild: 0.25.5@sentry/esbuild-plugin: 3.5.0
Steps to Reproduce
Just added the @sentry/esbuild-plugin:
import 'dotenv/config';
import esbuild from 'esbuild';
import { sentryEsbuildPlugin } from '@sentry/esbuild-plugin';
esbuild.build({
entryPoints: ['index.ts'],
sourcemap: true,
bundle: true,
minify: true,
platform: 'node',
outdir: 'dist',
allowOverwrite: true,
plugins: [
sentryEsbuildPlugin({
authToken: process.env.SENTRY_AUTH_TOKEN,
org: process.env.SENTRY_ORG,
project: process.env.SENTRY_PROJECT,
sourcemaps: {
filesToDeleteAfterUpload: ['**/*.js.map'],
},
}),
],
});If I comment out the plugin the warning is not being displayed. My entry point index.ts file does not have any exports. It's an express.js app so I don't have anything to export.
Expected Result
Not see a warning
Actual Result
I'm getting the following warning when I'm running the build:
▲ [WARNING] Import "default" will always be undefined because there is no matching export in "index.ts" [import-is-undefined]
index.ts?sentryProxyModule=true:4:44:
4 │ export default OriginalModule.default;
╵ ~~~~~~~
Activity
andreiborza commentedon Jun 10, 2025
Hi Lazar, thanks for filing this! Not sure when we'll get to this but this seems like a good first issue for potential outside contributors.
fix(esbuild): Avoid "Import 'default' will always be undefined" warning
linear-code commentedon Oct 29, 2026
JS-4039
fix(esbuild): Avoid import-is-undefined warning for entries without a…