Stop mutating column.options props and support immutable data object

[n3tr]

I notice that the MUIDataTable is mutating the props.columns.options value and it causes error when passing an immutable object to it.

Example, I'm using immer to update state and it produces immutable data object (using deep-freeze under the hood).

I think it is better to not mutate the props values inside the component.

Change

• Replace code that mutate props.columns.options by spreading column.options into new options before mutating

Example
https://codesandbox.io/s/dazzling-dijkstra-kmuf2

[gabrielliwerant]

Fair enough!

Couple of minor issues.

• The 'should correctly build internal table data and displayData structure when using nested data' test is broken by the changes, I think because you missed also changing line 425 to options.sortDirection.

• Line 412 is missing a semicolon which prevents webpack from compiling the project when running it in development.

[coveralls]

Coverage decreased (-0.08%) to 77.279% when pulling c7a9d53 on n3tr:stop-mutating-column-props into b8bee52 on gregnb:master.

[n3tr]

@gabrielliwerant Fixed :)

Sorry, I forgot to run test before push the change and didn't realize it breaks a test case.

[gabrielliwerant]

Looks like you accidentally pushed your local yarn lockfile with the last commit! I noticed when the line changes jumped by about 9k. :)

[n3tr]

@gabrielliwerant removed 😅

Should we add yarn.lock to .gitignore?

[gabrielliwerant]

@n3tr Hm, I guess that wouldn't hurt. Could also take it out if we switched to yarn in the future. I'll leave that up to you.

[n3tr]

@gabrielliwerant I will open separate PR for removing yarn.lock.

Do you know why TravisCI doesn't send the build status here?

[gabrielliwerant]

@n3tr Not sure. I actually don't have access to the CI administration for this library. My guess is that it just wasn't set up.

[n3tr]

@gabrielliwerant look like TravisCI deprecated Github commit status (https://blog.travis-ci.com/2018-09-27-deprecating-github-commit-status-api-for-github-apps-managed-repositories) and require owner to activate Travis CI app for this repo.