frameworks/projects/HTML5/asconfig.json

{
    "config": "flex",
    "compilerOptions": {
        "debug": true,
        "js-output-type": "flexjs",
        "define": [
            {
                "name": "COMPILE::SWF",
                "value": true
            },
            {
                "name": "COMPILE::JS",
                "value": false
            }
        ]
    },
    "files":
    [
        "src/main/flex/HTML5Classes.as"
    ]
}