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This is part of pulumi/coconut#147. After it has landed, I will rename the repo on GitHub.
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Lumi JavaScript (LumiJS)
LumiJS is a superset of a JavaScript (ECMAScript) subset. First, take a subset of JavaScript, and then superset it with optional typing annotations (using TypeScript's syntax and semantics for them).
Modules
LumiJS uses ES6-style modules.
An ES6 module is a special kind of script, which is just a file containing a list of top-level statements. LumiIL modules have a bit more structure to them to facilitate analysis and determinism. As a result, there is a mapping from LumiJS to LumiIL module structure.
The mapping simply records all declarations -- variables and functions -- and then moves all other statements into the
special module initializer (.init) function. In the case of blueprints, the special entrypoint function .main is
devoid of logic, because in Node.js-style of programming, the module initializer takes care of entrypoint functionality.