exit ts error but build success

Environment

roadhog version 2.3.0
Nodejs: 8.12.0
Npm: 6.4.1
Operating environment :macOS Mojave 10.14.3

I defined a variable t , tsc show error, but roadhog dev success

// Type '9' is not assignable to type 'string'.ts(2322)
const t: string = 9;

tsconfig.json

{
    "compilerOptions": {
        "module": "es6",
        "outDir": "lib",
        "target": "es6",
        "noUnusedLocals": true,
        "noEmitOnError": true,
        "moduleResolution": "node",
        "jsx": "react",
        "noEmit": true,
        "checkJs": false
    },
    "include": ["./src/**/*.ts"]
}

how to make roadhog compile faild ?

sorrycc / roadhog

exit ts error but build success #865

Environment