Error in index.js file

[makkhay]

I got this error while deploying:

8:23 error Expected '===' and instead saw '==' eqeqeq
17:80 error Each then() should return a value or throw promise/always-return
30:13 warning Avoid nesting promises promise/no-nesting
30:13 warning Avoid nesting promises promise/no-nesting
31:23 warning Unexpected function expression prefer-arrow-callback
31:23 error Each then() should return a value or throw promise/always-return
34:24 warning Unexpected function expression prefer-arrow-callback