One of the features missing in bun:ffi is inferring types for symbols from header files. This would let you import C libraries in JavaScript/TypeScript directly, without having to configure bindings.

We embed TinyCC for FFI, but TinyCC doesn't expose a way to read the types for exported symbols.

Currently, it looks like this:

      import { dlopen, FFIType, suffix } from "bun:ffi";

      // `suffix` is either "dylib", "so", or "dll" depending on the platform
      // you don't have to use "suffix", it's just there for convenience
      const path = `libsqlite3.${suffix}`;

      const {
        symbols: {
          sqlite3_libversion, // the function to call
        },
      } = dlopen(
        path, // a library name or file path
        {
          sqlite3_libversion: {
            // no arguments, returns a string
            args: [],
            returns: FFIType.cstring,
          },
        },
      );
      console.log(`SQLite 3 version: ${sqlite3_libversion()}`);

It would be nicer if it was something like this:

      import {sqlite3_libversion as version} from "sqlite3.h" with {lib: "sqlite3"};
      console.log(`SQLite 3 version: ${version()}`);

Would love to use Aro to do this in the future