compiler: break functions related to Decls out of Compile(). #1311
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Further ports from the original generics branch, to facilitate refactorings I'll need to finish generics support.
For each package-level entity we emit one or more Decl struct, which contains all JS code fragments and metadata required to produce the final executable script.
For each decl type (imports, vars, functions and types) I created a separate function that contains the logic responsible for its creation (and some auxiliary functions). The main objective is to keep the Compile() function very high-level and clearly reflecting various compilation stages we go through.
I tried to add comments to make the code more accessible for future contributors (and future self...), although there are still some aspects I don't fully grasp.
Ideally, we would have tests for all these new functions, but that's way more work than I'm able to take on right now.
(based on commit 146735d)
Updates #1013