Autocompletions in Monaco Editor for user added modules and libs

[Steve-Mcl]

REF: node-red/node-red#4359

The community has expressed a desire to have autocompletion in the function node for libs added in the setup tab of the function node and the older method of importing modules via functionGlobalContext.

This design doc will aim to determine the best balance and explore the possibilities before any work commences on the features.

For now, this document is a place holder and will be updated as information is gathered.

Goals

• offer autocompletions in monaco for entries made in functionGlobalContext
• offer autocompletions in monaco for entries made in function node setup tab

Tasks

• TODO
• TODO

Notes / brain dump

1. entries made in functionGlobalContext
   1. To achieve this, it may be necessary to adjust the structure of functionGlobalContext such that it permits additional properties like the location of 1 or more d.ts files, jsdoc hints etc.
2. entries made in function node setup tab
   1. Ideally, typings could be inferred but this depends heavily on how the lib is structured and how typings are offered (separate d.ts, multiple d.ts files, internal jsdoc, 100% inferred, what is exported from the lib etc)
   2. Alternatively, permit a user to add typings
      1. Both d.ts and jsdoc should be considered