rollup-plugin-typescript Unexpected token

[givanse]

Adding rollup-plugin-typescript results on:

Unexpected token (Note that you need plugins to import files that are not JavaScript)
        at BroccoliRollup
-~- created here: -~-
    at new Plugin (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/broccoli-plugin/index.js:31:32)
    at new BroccoliRollup (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/broccoli-rollup/dist/index.js:15:9)
    at rollup (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/broccoli-rollup/dist/index.js:10:12)
    at Object.apply (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/broccoli-rollup/index.js:9:20)
    at default (/Users/gsilvae/code/broccoli-rollup-typescript/Brocfile.js:10:10)
    at getBuilder (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/broccoli/lib/cli.js:174:31)
    at Command.module.exports.program.command.alias.description.option.option.option.option.option.option.option.option.action (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/broccoli/lib/cli.js:123:23)
    at Command.listener (/Users/gsilvae/code/broccoli-rollup-typescript/node_modules/commander/index.js:315:8)
    at emitTwo (events.js:126:13)
    at Command.emit (events.js:214:7)
-~- (end) -~-

Running Rollup alone, with the same config, works fine.

Repo with test case: https://github.com/givanse/broccoli-rollup-typescript-test-case