This Is Undefined

A module uses this at the top level, but in ES module context this is undefined. Rollup replaces it with undefined in the output. If the code is CommonJS being converted to ESM, add @rollup/plugin-commonjs or suppress the warning for intentional top-level this references.

References

rollupjs.org/troubleshooting/

In this namespace

← previous SOURCEMAP_BROKEN Sourcemap Broken next → UNRESOLVED_IMPORT Unresolved Import

MODULE_LEVEL_DIRECTIVE NAMESPACE_CONFLICT PARSE_ERROR PLUGIN_ERROR SOURCEMAP_BROKEN THIS_IS_UNDEFINED UNRESOLVED_IMPORT UNUSED_EXTERNAL_IMPORT