`reactstrap` import should occur before import of `./components/layers/addLayer`

'layersWithoutProjections' is never reassigned. Use 'const' instead

Use object destructuring

for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array

'key' is never reassigned. Use 'const' instead

Do not access Object.prototype method 'hasOwnProperty' from target object

'layerCount' is never reassigned. Use 'const' instead

Missing semicolon

Unexpected block statement surrounding arrow body; move the returned value immediately after the `=>`