TypeError: unique is not a function

[DevLab2425]

Following the first example in the README, I get a TypeError

TypeError: unique is not a function

Here is the sample file I've created:

index.js

import unique from 'unique-selector';

const DOM = '<span id="test" class="nav-item" aria-label="something">Some text</span>';
const options = {
    selectorTypes : [ 'ID', 'Class', 'Tag', 'NthChild' ]
}

console.log(typeof unique, JSON.stringify(unique)); // "object", {}
unique( DOM, options );

And here is the full error message

Error message

TypeError: unique is not a function
    at file:///Users/path/to/project/unique-selector-poc/index.js:10:1
    at ModuleJob.run (internal/modules/esm/module_job.js:146:23)
    at async Loader.import (internal/modules/esm/loader.js:165:24)
    at async Object.loadESM (internal/process/esm_loader.js:68:5)

package.json

{
  "name": "unique-selector-poc",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "unique-selector": "0.5.0"
  },
  "type": "module"
}

Please help me identify where I'm going wrong.