TypeScript AMD compilation and "barrel" modules - node.js

Question

I'm trying to set up a Node.js + TypeScript project using Intern for testing. Everything works fine when I compile the project using "commonjs" (which I do for the normal build); and TypeScript is equally happy when compiling for "amd", which is required by Intern. However, when passing the tests with intern-client, it complains about a couple of things:
First, imports from "index.ts" files (so-called "barrel" modules) won't work. My setup is something like this (everything in the same directory):
// index.ts
export { x } from './x'
// x.ts
export function x() {}
// x.test.ts
import { x } from '.' // "Error: Failed to load module ..."
In fact, the generated JavaScript code (for x.test.ts) looks something like this:
define(["require", "exports", "."], function (...) { ... })
And I'm not sure that AMD knows how to handle the ".".
The second issue happens under the same circumstances (TypeScript compiles happily, but intern-client complains). In summary, I get an error when doing:
import jsdom = require('jsdom')
Which I need to transform to:
const jsdom = require('jsdom')
For Intern to be able to deal with it.
Here is the tsconfig.json file I use to compile the tests:
{
"compilerOptions": {
"target": "es6",
"module": "amd",
"moduleResolution": "node",
"sourceMap": true,
"rootDir": "src",
"outDir": "build/tests",
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
}
}
And here is my intern.js configuration file, in case it helps:
define({
suites: ['build/tests/**/*.test.js'],
excludeInstrumentation: true,
filterErrorStack: true
})
Edit (2017-05-03)
To help understand the issue, here is an excerpt of the directory tree of the project:
build
tests // The compiled tests will end up here
src
core
utils
x.ts
x.test.ts
// Other files, each containing a function that I would like to unit-test...
intern.js
package.json
tsconfig.json
...

Answer 1

Regarding the first issue, AMD's handling of an import like '.' is different than Node's. While both of them will map '.' to a package, Node uses a default module name of index.js, while AMD uses main.js. To get things working in an AMD loader, you'll need to first define a package for '.', and then tell the AMD loader what default module to use for that package. Given your project layout, you could configure Intern like this:
loaderOptions: {
map: {
// When a module in src/ references 'src/utils', redirect
// it to 'utils'
'src': {
'src/utils': 'utils'
}
},
packages: [
// Define a package 'utils' with files in 'src/utils' that defaults
// to the module index.js
{ name: 'utils', location: 'src/utils', main: 'index.js' }
]
}
Regarding the second issue, its not clear what the problem actually is. Import statements will be transpiled into define dependencies by TypeScript, so Intern should never be seeing them.