chore: rough demo of promise usage

build.zig

@@ -20,6 +20,7 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
         .pic = true,
     });
+    module_lodestar_z_bun.addIncludePath(b.path("include"));
     b.modules.put(b.dupe("lodestar_z_bun"), module_lodestar_z_bun) catch @panic("OOM");
 
     const lib_lodestar_z_bun = b.addLibrary(.{

include/js_native_api_types.h

@@ -0,0 +1,211 @@
+#ifndef SRC_JS_NATIVE_API_TYPES_H_
+#define SRC_JS_NATIVE_API_TYPES_H_
+
+// This file needs to be compatible with C compilers.
+// This is a public include file, and these includes have essentially
+// became part of it's API.
+#include <stddef.h>  // NOLINT(modernize-deprecated-headers)
+#include <stdint.h>  // NOLINT(modernize-deprecated-headers)
+
+#if !defined __cplusplus || (defined(_MSC_VER) && _MSC_VER < 1900)
+typedef uint16_t char16_t;
+#endif
+
+#ifndef NAPI_CDECL
+#ifdef _WIN32
+#define NAPI_CDECL __cdecl
+#else
+#define NAPI_CDECL
+#endif
+#endif
+
+// JSVM API types are all opaque pointers for ABI stability
+// typedef undefined structs instead of void* for compile time type safety
+typedef struct napi_env__* napi_env;
+
+// We need to mark APIs which can be called during garbage collection (GC),
+// meaning that they do not affect the state of the JS engine, and can
+// therefore be called synchronously from a finalizer that itself runs
+// synchronously during GC. Such APIs can receive either a `napi_env` or a
+// `node_api_basic_env` as their first parameter, because we should be able to
+// also call them during normal, non-garbage-collecting operations, whereas
+// APIs that affect the state of the JS engine can only receive a `napi_env` as
+// their first parameter, because we must not call them during GC. In lieu of
+// inheritance, we use the properties of the const qualifier to accomplish
+// this, because both a const and a non-const value can be passed to an API
+// expecting a const value, but only a non-const value can be passed to an API
+// expecting a non-const value.
+//
+// In conjunction with appropriate CFLAGS to warn us if we're passing a const
+// (basic) environment into an API that expects a non-const environment, and
+// the definition of basic finalizer function pointer types below, which
+// receive a basic environment as their first parameter, and can thus only call
+// basic APIs (unless the user explicitly casts the environment), we achieve
+// the ability to ensure at compile time that we do not call APIs that affect
+// the state of the JS engine from a synchronous (basic) finalizer.
+#if !defined(NAPI_EXPERIMENTAL) ||                                             \
+    (defined(NAPI_EXPERIMENTAL) &&                                             \
+     (defined(NODE_API_EXPERIMENTAL_NOGC_ENV_OPT_OUT) ||                       \
+      defined(NODE_API_EXPERIMENTAL_BASIC_ENV_OPT_OUT)))
+typedef struct napi_env__* node_api_nogc_env;
+#else
+typedef const struct napi_env__* node_api_nogc_env;
+#endif
+typedef node_api_nogc_env node_api_basic_env;
+
+typedef struct napi_value__* napi_value;
+typedef struct napi_ref__* napi_ref;
+typedef struct napi_handle_scope__* napi_handle_scope;
+typedef struct napi_escapable_handle_scope__* napi_escapable_handle_scope;
+typedef struct napi_callback_info__* napi_callback_info;
+typedef struct napi_deferred__* napi_deferred;
+
+typedef enum {
+  napi_default = 0,
+  napi_writable = 1 << 0,
+  napi_enumerable = 1 << 1,
+  napi_configurable = 1 << 2,
+
+  // Used with napi_define_class to distinguish static properties
+  // from instance properties. Ignored by napi_define_properties.
+  napi_static = 1 << 10,
+
+#if NAPI_VERSION >= 8
+  // Default for class methods.
+  napi_default_method = napi_writable | napi_configurable,
+
+  // Default for object properties, like in JS obj[prop].
+  napi_default_jsproperty = napi_writable | napi_enumerable | napi_configurable,
+#endif  // NAPI_VERSION >= 8
+} napi_property_attributes;
+
+typedef enum {
+  // ES6 types (corresponds to typeof)
+  napi_undefined,
+  napi_null,
+  napi_boolean,
+  napi_number,
+  napi_string,
+  napi_symbol,
+  napi_object,
+  napi_function,
+  napi_external,
+  napi_bigint,
+} napi_valuetype;
+
+typedef enum {
+  napi_int8_array,
+  napi_uint8_array,
+  napi_uint8_clamped_array,
+  napi_int16_array,
+  napi_uint16_array,
+  napi_int32_array,
+  napi_uint32_array,
+  napi_float32_array,
+  napi_float64_array,
+  napi_bigint64_array,
+  napi_biguint64_array,
+} napi_typedarray_type;
+
+typedef enum {
+  napi_ok,
+  napi_invalid_arg,
+  napi_object_expected,
+  napi_string_expected,
+  napi_name_expected,
+  napi_function_expected,
+  napi_number_expected,
+  napi_boolean_expected,
+  napi_array_expected,
+  napi_generic_failure,
+  napi_pending_exception,
+  napi_cancelled,
+  napi_escape_called_twice,
+  napi_handle_scope_mismatch,
+  napi_callback_scope_mismatch,
+  napi_queue_full,
+  napi_closing,
+  napi_bigint_expected,
+  napi_date_expected,
+  napi_arraybuffer_expected,
+  napi_detachable_arraybuffer_expected,
+  napi_would_deadlock,  // unused
+  napi_no_external_buffers_allowed,
+  napi_cannot_run_js,
+} napi_status;
+// Note: when adding a new enum value to `napi_status`, please also update
+//   * `const int last_status` in the definition of `napi_get_last_error_info()'
+//     in file js_native_api_v8.cc.
+//   * `const char* error_messages[]` in file js_native_api_v8.cc with a brief
+//     message explaining the error.
+//   * the definition of `napi_status` in doc/api/n-api.md to reflect the newly
+//     added value(s).
+
+typedef napi_value(NAPI_CDECL* napi_callback)(napi_env env,
+                                              napi_callback_info info);
+typedef void(NAPI_CDECL* napi_finalize)(napi_env env,
+                                        void* finalize_data,
+                                        void* finalize_hint);
+
+#if !defined(NAPI_EXPERIMENTAL) ||                                             \
+    (defined(NAPI_EXPERIMENTAL) &&                                             \
+     (defined(NODE_API_EXPERIMENTAL_NOGC_ENV_OPT_OUT) ||                       \
+      defined(NODE_API_EXPERIMENTAL_BASIC_ENV_OPT_OUT)))
+typedef napi_finalize node_api_nogc_finalize;
+#else
+typedef void(NAPI_CDECL* node_api_nogc_finalize)(node_api_nogc_env env,
+                                                 void* finalize_data,
+                                                 void* finalize_hint);
+#endif
+typedef node_api_nogc_finalize node_api_basic_finalize;
+
+typedef struct {
+  // One of utf8name or name should be NULL.
+  const char* utf8name;
+  napi_value name;
+
+  napi_callback method;
+  napi_callback getter;
+  napi_callback setter;
+  napi_value value;
+
+  napi_property_attributes attributes;
+  void* data;
+} napi_property_descriptor;
+
+typedef struct {
+  const char* error_message;
+  void* engine_reserved;
+  uint32_t engine_error_code;
+  napi_status error_code;
+} napi_extended_error_info;
+
+#if NAPI_VERSION >= 6
+typedef enum {
+  napi_key_include_prototypes,
+  napi_key_own_only
+} napi_key_collection_mode;
+
+typedef enum {
+  napi_key_all_properties = 0,
+  napi_key_writable = 1,
+  napi_key_enumerable = 1 << 1,
+  napi_key_configurable = 1 << 2,
+  napi_key_skip_strings = 1 << 3,
+  napi_key_skip_symbols = 1 << 4
+} napi_key_filter;
+
+typedef enum {
+  napi_key_keep_numbers,
+  napi_key_numbers_to_strings
+} napi_key_conversion;
+#endif  // NAPI_VERSION >= 6
+
+#if NAPI_VERSION >= 8
+typedef struct {
+  uint64_t lower;
+  uint64_t upper;
+} napi_type_tag;
+#endif  // NAPI_VERSION >= 8
+
+#endif  // SRC_JS_NATIVE_API_TYPES_H_