Example: import javascript from gist

import.ts

export async function ImportModule(url: string) {
    const res = await fetch(url)
    const newBlob = new Blob([(await res.text())],{type: 'text/javascript'})
    return (await import(URL.createObjectURL(newBlob)))
}

person.js

export class Person {
  constructor(name, age) {
    this.name = name
    this.age = age
  }
  Say(msg) {
    console.log(`${this.name}:${msg}`)
  }
}

test.go

<script type="module">
  const ImportModule = async (gistURL) => {
    const res = await fetch(gistURL);
    const newBlob = new Blob([(await res.text())],{type: 'text/javascript'})
    const module = (await import(URL.createObjectURL(newBlob)))
    return module
  }

  (async ()=>{
    const module = await ImportModule("https://gist.githubusercontent.com/CarsonSlovoka/c19252bcbe8ac7f7decf9869fea3edd9/raw/a29e42bed1d18f0722fbaf3bd6a4281276322164/person.js")
    const carson = new module.Person("Carson", 18)
    carson.Say("hello world")
  })()
</script>

test.ts

import * as esm from "./import.js"
interface IPerson {
    name: string
    age: number
    Say: (msg: string) => void
}

const module = await esm.ImportModule("https://gist.githubusercontent.com/CarsonSlovoka/c19252bcbe8ac7f7decf9869fea3edd9/raw/a29e42bed1d18f0722fbaf3bd6a4281276322164/person.js")
const Person = module.Person
const carson = new Person("Carson", 18) as IPerson
carson.Say("hello")