const readTsconfigUp = require('read-tsconfig-up');

readTsconfigUp().then(result => {
    console.log(result);
    /*
    {
        tsconfig: {
            compilerOptions: {
                outDir: 'dist',
                // ...
            }
        },
        path: '/path/to/project/tsconfig.json'
    }
    */
});

console.log(readTsconfigUp.sync({cwd: './packages/foo'}));