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Auto cpp->zig bindings (#20881)

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Co-authored-by: pfgithub <6010774+pfgithub@users.noreply.github.com>
Co-authored-by: Ben Grant <ben@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
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pfg
2025-07-21 16:26:07 -07:00
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@@ -160,6 +160,7 @@ In particular, these are:
- `./src/codegen/generate-jssink.ts` -- Generates `build/debug/codegen/JSSink.cpp`, `build/debug/codegen/JSSink.h` which implement various classes for interfacing with `ReadableStream`. This is internally how `FileSink`, `ArrayBufferSink`, `"type": "direct"` streams and other code related to streams works.
- `./src/codegen/generate-classes.ts` -- Generates `build/debug/codegen/ZigGeneratedClasses*`, which generates Zig & C++ bindings for JavaScriptCore classes implemented in Zig. In `**/*.classes.ts` files, we define the interfaces for various classes, methods, prototypes, getters/setters etc which the code generator reads to generate boilerplate code implementing the JavaScript objects in C++ and wiring them up to Zig
- `./src/codegen/cppbind.ts` -- Generates automatic Zig bindings for C++ functions marked with `[[ZIG_EXPORT]]` attributes.
- `./src/codegen/bundle-modules.ts` -- Bundles built-in modules like `node:fs`, `bun:ffi` into files we can include in the final binary. In development, these can be reloaded without rebuilding Zig (you still need to run `bun run build`, but it re-reads the transpiled files from disk afterwards). In release builds, these are embedded into the binary.
- `./src/codegen/bundle-functions.ts` -- Bundles globally-accessible functions implemented in JavaScript/TypeScript like `ReadableStream`, `WritableStream`, and a handful more. These are used similarly to the builtin modules, but the output more closely aligns with what WebKit/Safari does for Safari's built-in functions so that we can copy-paste the implementations from WebKit as a starting point.