config.js

System.config({
  "baseURL": "/",
  "transpiler": "traceur",
  "paths": {
    "*": "*.js",
    "github:*": "jspm_packages/github/*.js"
  }
});

System.config({
  "map": {
    "traceur": "github:jmcriffey/[email protected]",
    "traceur-runtime": "github:jmcriffey/[email protected]"
  }
});

index.html

<script src="jspm_packages/system.js"></script>
<script src="config.js"></script>
<script>
    var System = System.clone();
    window.System = System;
    System.import('test').then(console.log.bind(console))
</script>

package.json

{
  "jspm": {
    "directories": {},
    "devDependencies": {
      "traceur": "github:jmcriffey/[email protected]",
      "traceur-runtime": "github:jmcriffey/[email protected]"
    }
  }
}

test.js

System.register('test', [], function(_export) {
  return {
    setters: [],
    execute: function() {
      _export('test', 'test');
    }
  };
});