Remove init() method from our JavaScript components

[romaricpascal]

What

Remove the init() method from our JavaScript components and move their initialisation to the bottom constructor().

Why

The init() method adds an unnecessary step for our components' initialisation,
without tangible benefits for what our components do. Without it we can simplify both how our components are initialised, as well as their internal implementation as we're looking to throw errors at instantiation.

Removing it entirely and moving its code to the constructor will ensure that components don't get a double initialisation by services that may have missed a .init() call during their migration. Instead, they'll get a clear error telling them that they're calling a method that no longer exists.

You can find more explanations of that decision in our decision record.

Who needs to work on this

Developers

Who needs to review this

Developers

Done when

• All components have had their init method removed and initialisation moved to the constructor()