Use node resolution for imports from npm packages

[LukasBombach]

If you run this script from the deno website in Rustyscript

import * as emoji from "npm:node-emoji";

console.log(emoji.emojify(`:sauropod: :heart:  npm`));

(assuming you have installed node-emoji as a depency in your node_modules) you will get an error saying

Relative import path "@sindresorhus/is" not prefixed with / or ./ or ../ from "file:///.../node_modules/node-emoji/lib/index.js"

This is because node-emoji imports @sindresorhus/is" which has no npm: prefix and will not be treated as an npm package by Rustyscript.

To fix this, I implemented a check if a dependency is imported from within node_modules and then treat it as an npm package, wheather or not it has an npm: prefix or not.

The specific implementation is taken from deno itself: deno/resolvers/deno/lib.rs Lines 242-255, they too check if an import got initiated from within the node_modules and issue an npm-package-import.

[rscarson]

Fantastic! Thanks for fixing this!

I'll merge it as soon as the tests pass!

[LukasBombach]

Thank you, currently trying to fix the tests!

[rscarson]

Lgtm!