Separate different outputs into modules, just connect and pipe through inputs and outputs

```
/modules
  /module-name
    input.js (service GET)
    build-function-name.js
    build-another-function-name.js
    output.js (service POST)
/utils
  function-used-in-several-places.js
index.js
...
```

```
// index.js
// ...
getAuth()
  .then(module1)
  .then(module2)
  .then(module3)
// etc
```