Importing JS that uses instanceof doesn't work.

[ccorcos]

Create a file test.js. Yes, a javascript file. This is to simulate using an external library.

module.exports = {
	isArray: function(x) {
		return x instanceof Array
	},
}

Now open up the REPL and try to use it:

$ ./node_modules/.bin/ts-node
> import * as t from "./test"
{}
> t.isArray([])
false

Took me a while to track this down and caused a lot of confusion!

[blakeembrey]

Looks like it's only from the REPL and related to context somehow, I'll have to see how node.js is using the REPL here and why imports are in a different context to the regular REPL.