Add "Hello world" example for build_node_compilers

[pulyaevskiy]

Requested in #15 (comment).

[pulyaevskiy]

Could probably just copy-paste e2e_interop_test to build_node_compilers/example/.

[chalin]

It takes all that just to translate void main() => print('Hello world');?

[pulyaevskiy]

Not sure if I'm following, sorry. Could you be more specific about "all that"?

A minimal project would have to consist of at least:

1. pubspec.yaml with dependency on the compilers package
2. build.yaml to configure compilers
3. node/main.dart with "hello world" code

[chalin]

Ok, that's looking good. Do the files need to be under node? Might it be possible / make sense to use build_node_compilers without node_interop (e.g., I'd assume that print() might just map to console.log())? Thanks

[chalin]

(Oh, and by "all that", I was expressing my hope that a minimal "hello world" example might indeed contain fewer files. :)

[pulyaevskiy]

a minimal "hello world" example might indeed contain fewer files.

Sorry, I wasn't clear. :) What I really meant by "copy-paste" is "copy-paste and cleanup by removing extra stuff".

Do the files need to be under node?

This is convention I'm trying to follow (and promote). Similarly how web projects put their entrypoints inside web. You probably can put your entrypoints in some other fodler but this would require more configuration in build.yaml.

Note: by "entrypoint" I mean a Dart file containing main function. Everything else can and should go in lib/ as usual.

Might it be possible / make sense to use build_node_compilers without node_interop.

Possible - yes, using node_interop is completely optional.
Makes sense - depends on your use case, I guess. If you don't need to access any Node-specific APIs then yeah, you can just write plain Dart code, compile and use in Node.

node_interop itself is purely bindings to Node APIs.

You are also free to define your own Node API bindings and use those instead of node_interop.

[chalin]

What I really meant by "copy-paste" is "copy-paste and cleanup by removing extra stuff".

That sounds good! And thanks for answering my questions.