The "distDir" output is not showing up for Parcel 2.13.3 "build" execution

I've been trying to get an output from Parcel for quite a while with no luck. Initially, I had a "main" element at the top of package.json. I read that this is not recommended, so in my "targets" I included "main":false. I initially had "distDir": "dist", and when doing "npm run build" it didn't create it, I changed it to "./build_output"; same result. But it Does produce the .parcel-cache folder. I have disabled firewall and antivirus, thinking maybe file creation is getting squashed; no difference. Here is my package.json:

    "name": "rapier_dist",
    "private": true,
    "version": "0.0.0",
    "type": "module",
    "scripts": {
        "dev": "parcel src/main.js --port 1234 --target browser --log-level verbose",
        "build": "parcel build src/main.js --public-url ./ --target browser --log-level verbose",
        "preview": "parcel src/main.js --port 1234"
    },
    "targets": {
        "main":  false,
        "browser": {
           "source": "src/main.js",
            "distDir": "./build_output"
        }
    },
    "devDependencies": {
        "parcel": "2.13.3"
    },
    "dependencies": {
        "@dimforge/rapier2d": "0.17.0",
        "rapier_dist": "file:.."
    }
}```
I'm not very familiar with "bundling" or wasm; just trying to get a rapier2d build that I can import into my javascript code.  Any advice is appreciated!