Configuration pure doesn't seem to work

[Virtute90]

When I use the pure option, it doesn't seem to have any effect:

import { defineConfig } from 'tsup';

export default defineConfig({
  entry: ['src/**/*.@(ts|tsx)'],
  format: ['cjs', 'esm'],
  target: 'esnext',
  treeshake: true,
  pure: 'useContext',
  dts: false,
  splitting: false,
  sourcemap: true,
  clean: true,
  minify: true
});

when i build the project with treeshake active i get these warnings

"useContext" is imported from external module "react" but never used in "dist/Header/Header.js". Generated an empty chunk: "types".

Same effect if I use CLI

npx tsup --pure useContext

Am I doing something wrong?

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