Use rewatch to build runtime, tests etc.

[cknitt]

Since #7063 and #7068, the infamous ninja.js is gone, and runtime/stdlib and tests are built with the standard ReScript build tooling (rescript.json, rescript wrapper script, bsb/bsb_helper/ninja).

In order to eventually get rid of bsb, bsb_helper and ninja completely, we need to build all these with rewatch instead:

• runtime
• tests/tests
• tests/build_tests/*
• tests/gentype_tests/*

Note:

• Building runtime is a bit special with -make-runtime and the resulting paths in the JS output. When I last tried it with rewatch, I wasn't able to get the same paths in the JS output.
• Even with the standard tooling, I was only able to get it to work as required with all source files in the runtime root. But the goal would be to be able to group them into subfolders (core, belt, js, primitives, ...).

@jfrolich @rolandpeelen could you take a stab at this?

[rolandpeelen]

@jfrolich -- Shall we have a chat about this the coming week / divide & conquer? I might be able to clear up some time to do some smaller tasks

[jfrolich]

Yes, same same! 👍

[cknitt]

After #7593, it can be clearly seen where the legacy build is still used by searching for rescript legacy build.

I had to resort to using the legacy build for the various test repos because with rewatch I would either get panics or missing dependency errors.

[cknitt]

When building the runtime with rewatch on Windows in CI, I get

Can't continue... Found a circular dependency in your code:
Js_dict
 → Js
 → Js_dict

whereas other platforms work fine. 😲

[nojaf]

When building the runtime with rewatch on Windows in CI, I get

Can't continue... Found a circular dependency in your code:
Js_dict
 → Js
 → Js_dict

whereas other platforms work fine. 😲

This was fixed in ddb75e3

[cristianoc]

When building the runtime with rewatch on Windows in CI, I get

Can't continue... Found a circular dependency in your code:
Js_dict
 → Js
 → Js_dict

whereas other platforms work fine. 😲

This was fixed in ddb75e3

Does this mean we can switch now?