Rollup prunes dynamic import hook

.gitignore

build
node_modules
package-lock.json

dynamic.js

console.log("lol");

input.js

import("./dynamic.js");

package.json

{
  "name": "rollup-purge",
  "scripts": {
    "build": "rollup -c"
  }
}

rollup.config.js

const MARKER = "myimport:";

export default {
  input: "input.js",
  output: {
    dir: "build",
    format: "esm"
  },
  preserveEntrySignatures: false,
  plugins: [
    {
      resolveId(id) {
        if (id === MARKER) {
          return MARKER;
        }
      },
      load(id) {
        if (id === MARKER) {
          return `export function myimport(id){}`;
        }
      },
      transform(code, id) {
        if (id === MARKER) {
          return;
        }
        return `
					import {myimport} from "${MARKER}"; ${code}
					// It works with the following line 
					// self[Symbol()] = myimport;
				`;
      },
      renderDynamicImport(moduleId) {
        if (moduleId === MARKER) {
          return;
        }
        return {
          left: "myimport(",
          right: ", import.meta.url)"
        };
      }
    }
  ]
};