Mail: Add Prettier for consistent code formatting

[kevgathuku]

When making changes, I'm finding that most of the diffs are formatting changes rather than actual code changes
Prettier is a nice tool we could use to have consistent formatting throughout the codebase

[kevgathuku]

What do you think @ChristophWurst ?
I'm thinking of doing this as part of the Vue rewrite

[ChristophWurst]

Absolutely, this coding style is quite inconsistent right now. I remember @skjnldsv telling me that I should use a certain tool, which one was it?

[skjnldsv]

Depends on the tech, eslint for js, stylelint for css :)
That's the two most used and they integrate nicely on webpack

[kevgathuku]

Prettier is concerned only with code formatting i.e. semicolons, tabs/spaces, etc.
eslint and stylelint are complementary tools for finding errors in the js/css files

And as @skjnldsv says they play well together 😄

[skjnldsv]

@kevgathuku eslint and stylelint also handle formatting ;)

[kevgathuku]

Closed in #1172