`node --experimental-policy policy.json checked.js` , from https://github.com/bmeck/node/tree/policy

checked.js

console.log('typeof fs %s', typeof require('fs'));

policy.json

{
  "policies": {
    "from_tool": {
      "privileges": {
        "dependencies": {
          "fs": false
        }
      }
    }
  },
  "resources": {
    "file:///absolute/path/to/checked.js": {
      "integrity": "sha384-SggXRQHwCG8g+DktYYzxkXRIkTiEYWBHqev0xnpCxYlqMBufKZHAHQM3/boDaI/0",
      "policy": "from_tool"
    }
  }
}