Support for `.js` extension

[thetutlage]

Not sure if it is the job of this package to handle .js files. However, I am using this package to run my tests and using tsc to create the distribution build.

TypeScript forces the import file extension to be .js and not .ts, which does not work with this package. For example:

Following works with esbuild-node-loader, but tsc does not compile it

import Foo from './foo.ts'

Following works with tsc, but not with esbuild-node-loader.

import Foo from './foo.js'

[hanayashiki]

it should work now. We're using the ts module resolution directly

[thetutlage]

Thanks :)