Improve internal type safety

[adamjkb]

The extension's internal type safety isn't the best it could be. There are a lot of red squigglies. This is part due to Prisma.getExtensionContext not really providing much of a context really other than the 'name' property. While technically it is possible to do client[ctx.name].<prismaMethodName>() it isn't really the whole story. Prisma will likely provide better tools in the future.

There are also a decent amount of squigglies because of a "non typescript" way of going about internal variable assignment. Thinking of:

/** @type {string} */
let path

if (node) {
   path = node.path
   //   ...
} else if (where) {
   // ...
}