fs.c
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fs.c
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	#include <compat.h> // IWYU pragma: keep

	#include <uv.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <fcntl.h>
	#include <uthash.h>
	#include <utarray.h>
	#include <errno.h>

	#include "ant.h"
	#include "utf8.h"
	#include "utils.h"
	#include "base64.h"
	#include "errors.h"
	#include "internal.h"
	#include "runtime.h"
	#include "descriptors.h"

	#include "modules/fs.h"
	#include "modules/buffer.h"
	#include "modules/symbol.h"

	#define fs_err_code(js, code, op, path) ({ \
	jsval_t _props = js_mkobj(js); \
	js_set(js, _props, "code", js_mkstr(js, code, strlen(code))); \
	js_mkerr_props(js, JS_ERR_TYPE, _props, "%s: %s, %s '%s'", code, strerror(errno), op, path); \
	})

	typedef enum {
	FS_ENC_NONE = 0,
	FS_ENC_UTF8,
	FS_ENC_UTF16LE,
	FS_ENC_LATIN1,
	FS_ENC_BASE64,
	FS_ENC_BASE64URL,
	FS_ENC_HEX,
	FS_ENC_ASCII,
	} fs_encoding_t;

	static jsval_t fs_coerce_path(ant_t *js, jsval_t arg) {
	if (vtype(arg) == T_STR) return arg;
	if (is_object_type(arg)) {
	jsval_t pathname = js_get(js, arg, "pathname");
	if (vtype(pathname) == T_STR) return pathname;
	}
	return js_mkundef();
	}

	static fs_encoding_t parse_encoding(ant_t *js, jsval_t arg) {
	size_t len;
	const char *str = NULL;

	if (vtype(arg) == T_STR) str = js_getstr(js, arg, &len);
	else if (vtype(arg) == T_OBJ) {
	jsval_t enc = js_get(js, arg, "encoding");
	if (vtype(enc) == T_STR) str = js_getstr(js, enc, &len);
	}

	if (!str) return FS_ENC_NONE;

	if (len == 4 && memcmp(str, "utf8", 4) == 0) return FS_ENC_UTF8;
	if (len == 5 && memcmp(str, "utf-8", 5) == 0) return FS_ENC_UTF8;
	if (len == 7 && memcmp(str, "utf16le", 7) == 0) return FS_ENC_UTF16LE;
	if (len == 4 && memcmp(str, "ucs2", 4) == 0) return FS_ENC_UTF16LE;
	if (len == 5 && memcmp(str, "ucs-2", 5) == 0) return FS_ENC_UTF16LE;
	if (len == 6 && memcmp(str, "latin1", 6) == 0) return FS_ENC_LATIN1;
	if (len == 6 && memcmp(str, "binary", 6) == 0) return FS_ENC_LATIN1;
	if (len == 6 && memcmp(str, "base64", 6) == 0) return FS_ENC_BASE64;
	if (len == 9 && memcmp(str, "base64url", 9) == 0) return FS_ENC_BASE64URL;
	if (len == 3 && memcmp(str, "hex", 3) == 0) return FS_ENC_HEX;
	if (len == 5 && memcmp(str, "ascii", 5) == 0) return FS_ENC_ASCII;

	return FS_ENC_NONE;
	}

	static jsval_t encode_data(ant_t js, const char data, size_t len, fs_encoding_t enc) {
	switch (enc) {
	case FS_ENC_UTF8:
	case FS_ENC_LATIN1:
	case FS_ENC_ASCII: return js_mkstr(js, data, len);

	case FS_ENC_HEX: {
	char out = malloc(len 2);
	if (!out) return js_mkerr(js, "Out of memory");
	for (size_t i = 0; i < len; i++) {
	out[i * 2] = hex_char((unsigned char)data[i] >> 4);
	out[i * 2 + 1] = hex_char(data[i]);
	}
	jsval_t result = js_mkstr(js, out, len * 2);
	free(out); return result;
	}

	case FS_ENC_BASE64: {
	size_t out_len;
	char out = ant_base64_encode((const uint8_t )data, len, &out_len);
	if (!out) return js_mkerr(js, "Out of memory");
	jsval_t result = js_mkstr(js, out, out_len);
	free(out); return result;
	}

	case FS_ENC_BASE64URL: {
	size_t out_len;
	char out = ant_base64_encode((const uint8_t )data, len, &out_len);
	if (!out) return js_mkerr(js, "Out of memory");
	for (size_t i = 0; i < out_len; i++) {
	if (out[i] == '+') out[i] = '-';
	else if (out[i] == '/') out[i] = '_';
	}
	while (out_len > 0 && out[out_len - 1] == '=') out_len--;
	jsval_t result = js_mkstr(js, out, out_len);
	free(out); return result;
	}

	case FS_ENC_UTF16LE: {
	const unsigned char s = (const unsigned char )data;
	char out = malloc((len / 2) 4);
	if (!out) return js_mkerr(js, "Out of memory");
	size_t j = 0;
	for (size_t i = 0; i + 1 < len; i += 2) {
	uint32_t cp = s[i] \| (s[i + 1] << 8);
	bool is_hi = cp >= 0xD800 && cp <= 0xDBFF && i + 3 < len;
	uint32_t lo = is_hi ? s[i + 2] \| (s[i + 3] << 8) : 0;
	bool is_pair = is_hi && lo >= 0xDC00 && lo <= 0xDFFF;
	if (is_pair) { cp = 0x10000 + ((cp - 0xD800) << 10) + (lo - 0xDC00); i += 2; }
	j += utf8_encode(cp, out + j);
	}
	jsval_t result = js_mkstr(js, out, j);
	free(out); return result;
	}

	default: return js_mkstr(js, data, len);
	}
	}

	typedef enum {
	FS_OP_READ,
	FS_OP_WRITE,
	FS_OP_UNLINK,
	FS_OP_MKDIR,
	FS_OP_RMDIR,
	FS_OP_STAT,
	FS_OP_READ_BYTES,
	FS_OP_EXISTS,
	FS_OP_READDIR,
	FS_OP_ACCESS,
	FS_OP_WRITE_FD,
	FS_OP_OPEN,
	FS_OP_CLOSE
	} fs_op_type_t;

	typedef struct fs_request_s {
	uv_fs_t uv_req;
	ant_t *js;
	jsval_t promise;
	char *path;
	char *data;
	char *error_msg;
	size_t data_len;
	fs_op_type_t op_type;
	fs_encoding_t encoding;
	uv_file fd;
	int completed;
	int failed;
	int recursive;
	} fs_request_t;

	static UT_array *pending_requests = NULL;

	static void free_fs_request(fs_request_t *req) {
	if (!req) return;

	if (req->path) free(req->path);
	if (req->data) free(req->data);
	if (req->error_msg) free(req->error_msg);

	uv_fs_req_cleanup(&req->uv_req);
	free(req);
	}

	static void remove_pending_request(fs_request_t *req) {
	if (!req \|\| !pending_requests) return;
	unsigned int len = utarray_len(pending_requests);

	for (unsigned int i = 0; i < len; i++) {
	if ((fs_request_t*)utarray_eltptr(pending_requests, i) != req) continue;
	utarray_erase(pending_requests, i, 1); break;
	}
	}

	static jsval_t fs_read_to_uint8array(ant_t js, const char data, size_t len) {
	ArrayBufferData *ab = create_array_buffer_data(len);
	if (!ab) return js_mkundef();
	memcpy(ab->data, data, len);
	jsval_t result = create_typed_array(js, TYPED_ARRAY_UINT8, ab, 0, len, "Buffer");
	if (vtype(result) == T_ERR) free_array_buffer_data(ab);
	return result;
	}

	static void complete_request(fs_request_t *req) {
	if (req->failed) {
	const char *err_msg = req->error_msg ? req->error_msg : "Unknown error";
	jsval_t reject_value = js_mkerr(req->js, "%s", err_msg);
	if (is_err(reject_value)) {
	reject_value = req->js->thrown_value;
	if (vtype(reject_value) == T_UNDEF) {
	reject_value = js_mkstr(req->js, err_msg, strlen(err_msg));
	}
	req->js->thrown_exists = false;
	req->js->thrown_value = js_mkundef();
	}
	js_reject_promise(req->js, req->promise, reject_value);
	} else {
	jsval_t result = js_mkundef();
	if (req->op_type == FS_OP_READ && req->data) {
	if (req->encoding != FS_ENC_NONE)
	result = encode_data(req->js, req->data, req->data_len, req->encoding);
	else result = fs_read_to_uint8array(req->js, req->data, req->data_len);
	} else if (req->op_type == FS_OP_READ_BYTES && req->data)
	result = js_mkstr(req->js, req->data, req->data_len);
	js_resolve_promise(req->js, req->promise, result);
	}

	remove_pending_request(req);
	free_fs_request(req);
	}

	static void on_read_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->data_len = uv_req->result;
	uv_fs_t close_req;

	uv_fs_close(uv_default_loop(), &close_req, req->fd, NULL);
	uv_fs_req_cleanup(&close_req);

	req->completed = 1;
	complete_request(req);
	}

	static void on_open_for_read(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->fd = (int)uv_req->result;
	uv_fs_req_cleanup(uv_req);

	uv_fs_t stat_req;
	int stat_result = uv_fs_fstat(uv_default_loop(), &stat_req, req->fd, NULL);

	if (stat_result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(stat_result));
	req->completed = 1;
	uv_fs_t close_req;
	uv_fs_close(uv_default_loop(), &close_req, req->fd, NULL);
	uv_fs_req_cleanup(&close_req);
	complete_request(req);
	return;
	}

	size_t file_size = stat_req.statbuf.st_size;
	uv_fs_req_cleanup(&stat_req);

	size_t alloc_size = (req->op_type == FS_OP_READ) ? file_size + 1 : file_size;
	req->data = malloc(alloc_size);
	if (!req->data) {
	req->failed = 1;
	req->error_msg = strdup("Out of memory");
	req->completed = 1;
	uv_fs_t close_req;
	uv_fs_close(uv_default_loop(), &close_req, req->fd, NULL);
	uv_fs_req_cleanup(&close_req);
	complete_request(req);
	return;
	}

	uv_buf_t buf = uv_buf_init(req->data, (unsigned int)file_size);
	int read_result = uv_fs_read(uv_default_loop(), uv_req, req->fd, &buf, 1, 0, on_read_complete);

	if (read_result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(read_result));
	req->completed = 1;
	uv_fs_t close_req;
	uv_fs_close(uv_default_loop(), &close_req, req->fd, NULL);
	uv_fs_req_cleanup(&close_req);
	complete_request(req);
	return;
	}
	}

	static void on_write_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	}

	uv_fs_t close_req;
	uv_fs_close(uv_default_loop(), &close_req, req->fd, NULL);
	uv_fs_req_cleanup(&close_req);

	req->completed = 1;
	complete_request(req);
	}

	static void on_open_for_write(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->fd = (int)uv_req->result;
	uv_fs_req_cleanup(uv_req);

	uv_buf_t buf = uv_buf_init(req->data, (unsigned int)req->data_len);
	int write_result = uv_fs_write(uv_default_loop(), uv_req, req->fd, &buf, 1, 0, on_write_complete);

	if (write_result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(write_result));
	req->completed = 1;
	uv_fs_t close_req;
	uv_fs_close(uv_default_loop(), &close_req, req->fd, NULL);
	uv_fs_req_cleanup(&close_req);
	complete_request(req);
	return;
	}
	}

	static void on_unlink_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	}

	uv_fs_req_cleanup(uv_req);
	req->completed = 1;
	complete_request(req);
	}

	static void on_mkdir_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	if (!req->recursive \|\| uv_req->result != UV_EEXIST) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	}}

	uv_fs_req_cleanup(uv_req);
	req->completed = 1;
	complete_request(req);
	}

	static void on_rmdir_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	}

	uv_fs_req_cleanup(uv_req);
	req->completed = 1;
	complete_request(req);
	}

	static void on_stat_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	jsval_t stat_obj = js_mkobj(req->js);
	jsval_t proto = js_get_ctor_proto(req->js, "Stats", 5);
	if (is_object_type(proto)) js_set_proto(req->js, stat_obj, proto);

	uv_stat_t *st = &uv_req->statbuf;
	js_set_slot(req->js, stat_obj, SLOT_DATA, js_mknum((double)st->st_mode));
	js_set(req->js, stat_obj, "size", js_mknum((double)st->st_size));
	js_set(req->js, stat_obj, "mode", js_mknum((double)st->st_mode));
	js_set(req->js, stat_obj, "uid", js_mknum((double)st->st_uid));
	js_set(req->js, stat_obj, "gid", js_mknum((double)st->st_gid));

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, stat_obj);
	remove_pending_request(req);
	free_fs_request(req);
	}

	static void on_exists_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;
	jsval_t result = js_bool(uv_req->result >= 0);

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, result);
	remove_pending_request(req);
	free_fs_request(req);
	}

	static void on_access_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, js_mkundef());
	remove_pending_request(req);
	free_fs_request(req);
	}

	static void on_readdir_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	jsval_t arr = js_mkarr(req->js);
	uv_dirent_t dirent;

	while (uv_fs_scandir_next(uv_req, &dirent) != UV_EOF) {
	jsval_t name = js_mkstr(req->js, dirent.name, strlen(dirent.name));
	js_arr_push(req->js, arr, name);
	}

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, arr);
	remove_pending_request(req);
	free_fs_request(req);
	}

	static jsval_t builtin_fs_readFileSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "readFileSync() requires a path argument");

	jsval_t path_val = fs_coerce_path(js, args[0]);
	if (vtype(path_val) != T_STR) return js_mkerr(js, "readFileSync() path must be a string or URL");

	size_t path_len;
	char *path = js_getstr(js, path_val, &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	FILE *file = fopen(path_cstr, "rb");
	if (!file) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to open file: %s", strerror(errno));
	free(path_cstr); return js_mkerr(js, "%s", err_msg);
	}

	fseek(file, 0, SEEK_END);
	long file_size = ftell(file);
	fseek(file, 0, SEEK_SET);

	if (file_size < 0) {
	fclose(file);
	free(path_cstr);
	return js_mkerr(js, "Failed to get file size");
	}

	char *data = malloc(file_size + 1);
	if (!data) {
	fclose(file);
	free(path_cstr);
	return js_mkerr(js, "Out of memory");
	}

	size_t bytes_read = fread(data, 1, file_size, file);
	fclose(file);
	free(path_cstr);

	if (bytes_read != (size_t)file_size) {
	free(data);
	return js_mkerr(js, "Failed to read entire file");
	}

	fs_encoding_t enc = (nargs > 1) ? parse_encoding(js, args[1]) : FS_ENC_NONE;
	jsval_t result = (enc != FS_ENC_NONE)
	? encode_data(js, data, file_size, enc)
	: fs_read_to_uint8array(js, data, file_size);

	free(data);
	return result;
	}

	static jsval_t builtin_fs_readBytesSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "readBytesSync() requires a path argument");
	if (vtype(args[0]) != T_STR) return js_mkerr(js, "readBytesSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	FILE *file = fopen(path_cstr, "rb");
	if (!file) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to open file: %s", strerror(errno));
	free(path_cstr); return js_mkerr(js, "%s", err_msg);
	}

	fseek(file, 0, SEEK_END);
	long file_size = ftell(file);
	fseek(file, 0, SEEK_SET);

	if (file_size < 0) {
	fclose(file);
	free(path_cstr);
	return js_mkerr(js, "Failed to get file size");
	}

	char *data = malloc(file_size);
	if (!data) {
	fclose(file);
	free(path_cstr);
	return js_mkerr(js, "Out of memory");
	}

	size_t bytes_read = fread(data, 1, file_size, file);
	fclose(file);
	free(path_cstr);

	if (bytes_read != (size_t)file_size) {
	free(data);
	return js_mkerr(js, "Failed to read entire file");
	}

	jsval_t result = js_mkstr(js, data, file_size);
	free(data);

	return result;
	}

	static jsval_t builtin_fs_readFile(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "readFile() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "readFile() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_READ;
	req->encoding = (nargs > 1) ? parse_encoding(js, args[1]) : FS_ENC_NONE;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_open(uv_default_loop(), &req->uv_req, req->path, O_RDONLY, 0, on_open_for_read);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_readBytes(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "readBytes() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "readBytes() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_READ_BYTES;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_open(uv_default_loop(), &req->uv_req, req->path, O_RDONLY, 0, on_open_for_read);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_writeFileSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "writeFileSync() requires path and data arguments");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "writeFileSync() path must be a string");
	if (vtype(args[1]) != T_STR) return js_mkerr(js, "writeFileSync() data must be a string");

	size_t path_len, data_len;
	char *path = js_getstr(js, args[0], &path_len);
	char *data = js_getstr(js, args[1], &data_len);

	if (!path \|\| !data) return js_mkerr(js, "Failed to get arguments");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	FILE *file = fopen(path_cstr, "wb");
	if (!file) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to open file: %s", strerror(errno));
	free(path_cstr); return js_mkerr(js, "%s", err_msg);
	}

	size_t bytes_written = fwrite(data, 1, data_len, file);
	fclose(file);
	free(path_cstr);

	if (bytes_written != data_len) {
	return js_mkerr(js, "Failed to write entire file");
	}

	return js_mkundef();
	}

	static jsval_t builtin_fs_copyFileSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "copyFileSync() requires src and dest arguments");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "copyFileSync() src must be a string");
	if (vtype(args[1]) != T_STR) return js_mkerr(js, "copyFileSync() dest must be a string");

	size_t src_len, dest_len;
	char *src = js_getstr(js, args[0], &src_len);
	char *dest = js_getstr(js, args[1], &dest_len);

	if (!src \|\| !dest) return js_mkerr(js, "Failed to get arguments");

	char *src_cstr = strndup(src, src_len);
	char *dest_cstr = strndup(dest, dest_len);
	if (!src_cstr \|\| !dest_cstr) {
	free(src_cstr);
	free(dest_cstr);
	return js_mkerr(js, "Out of memory");
	}

	FILE *in = fopen(src_cstr, "rb");
	if (!in) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to open source file: %s", strerror(errno));
	free(src_cstr); free(dest_cstr);
	return js_mkerr(js, "%s", err_msg);
	}

	FILE *out = fopen(dest_cstr, "wb");
	if (!out) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to open dest file: %s", strerror(errno));
	fclose(in);
	free(src_cstr); free(dest_cstr);
	return js_mkerr(js, "%s", err_msg);
	}

	char buf[8192];
	size_t n;
	while ((n = fread(buf, 1, sizeof(buf), in)) > 0) {
	if (fwrite(buf, 1, n, out) != n) {
	fclose(in);
	fclose(out);
	free(src_cstr);
	free(dest_cstr);
	return js_mkerr(js, "Failed to write to dest file");
	}
	}

	fclose(in);
	fclose(out);
	free(src_cstr);
	free(dest_cstr);

	return js_mkundef();
	}

	static jsval_t builtin_fs_renameSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "renameSync() requires oldPath and newPath arguments");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "renameSync() oldPath must be a string");
	if (vtype(args[1]) != T_STR) return js_mkerr(js, "renameSync() newPath must be a string");

	size_t old_len, new_len;
	char *old_path = js_getstr(js, args[0], &old_len);
	char *new_path = js_getstr(js, args[1], &new_len);

	if (!old_path \|\| !new_path) return js_mkerr(js, "Failed to get arguments");

	char *old_cstr = strndup(old_path, old_len);
	char *new_cstr = strndup(new_path, new_len);
	if (!old_cstr \|\| !new_cstr) {
	free(old_cstr);
	free(new_cstr);
	return js_mkerr(js, "Out of memory");
	}

	int result = rename(old_cstr, new_cstr);
	free(old_cstr);
	free(new_cstr);

	if (result != 0) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to rename: %s", strerror(errno));
	return js_mkerr(js, "%s", err_msg);
	}

	return js_mkundef();
	}

	static jsval_t builtin_fs_appendFileSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "appendFileSync() requires path and data arguments");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "appendFileSync() path must be a string");
	if (vtype(args[1]) != T_STR) return js_mkerr(js, "appendFileSync() data must be a string");

	size_t path_len, data_len;
	char *path = js_getstr(js, args[0], &path_len);
	char *data = js_getstr(js, args[1], &data_len);

	if (!path \|\| !data) return js_mkerr(js, "Failed to get arguments");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	FILE *file = fopen(path_cstr, "ab");
	if (!file) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to open file: %s", strerror(errno));
	free(path_cstr); return js_mkerr(js, "%s", err_msg);
	}

	size_t bytes_written = fwrite(data, 1, data_len, file);
	fclose(file);
	free(path_cstr);

	if (bytes_written != data_len) {
	return js_mkerr(js, "Failed to write entire file");
	}

	return js_mkundef();
	}

	static jsval_t builtin_fs_writeFile(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "writeFile() requires path and data arguments");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "writeFile() path must be a string");
	if (vtype(args[1]) != T_STR) return js_mkerr(js, "writeFile() data must be a string");

	size_t path_len, data_len;
	char *path = js_getstr(js, args[0], &path_len);
	char *data = js_getstr(js, args[1], &data_len);

	if (!path \|\| !data) return js_mkerr(js, "Failed to get arguments");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_WRITE;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->data = malloc(data_len);
	if (!req->data) {
	free(req->path);
	free(req);
	return js_mkerr(js, "Out of memory");
	}

	memcpy(req->data, data, data_len);
	req->data_len = data_len;
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_open(uv_default_loop(), &req->uv_req, req->path, O_WRONLY \| O_CREAT \| O_TRUNC, 0644, on_open_for_write);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_unlinkSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "unlinkSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "unlinkSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	int result = unlink(path_cstr);
	free(path_cstr);

	if (result != 0) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to unlink file: %s", strerror(errno));
	return js_mkerr(js, "%s", err_msg);
	}

	return js_mkundef();
	}

	static jsval_t builtin_fs_unlink(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "unlink() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "unlink() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_UNLINK;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_unlink(uv_default_loop(), &req->uv_req, req->path, on_unlink_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_mkdirSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "mkdirSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "mkdirSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	int mode = 0755;
	int recursive = 0;

	if (nargs < 2) goto do_mkdir;

	switch (vtype(args[1])) {
	case T_NUM:
	mode = (int)js_getnum(args[1]);
	break;
	case T_OBJ: {
	jsval_t opt = args[1];
	recursive = js_get(js, opt, "recursive") == js_true;
	jsval_t mode_val = js_get(js, opt, "mode");
	if (vtype(mode_val) == T_NUM) mode = (int)js_getnum(mode_val);
	break;
	}
	}

	do_mkdir:

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	#ifdef _WIN32
	(void)mode;
	int result = _mkdir(path_cstr);
	#else
	int result = mkdir(path_cstr, (mode_t)mode);
	#endif
	free(path_cstr);

	if (result != 0) {
	if (recursive && errno == EEXIST) {
	return js_mkundef();
	}
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to create directory: %s", strerror(errno));
	return js_mkerr(js, "%s", err_msg);
	}

	return js_mkundef();
	}

	static jsval_t builtin_fs_mkdir(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "mkdir() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "mkdir() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	int mode = 0755;
	int recursive = 0;
	if (nargs >= 2) {
	switch (vtype(args[1])) {
	case T_NUM:
	mode = (int)js_getnum(args[1]);
	break;
	case T_OBJ: {
	jsval_t opt = args[1];
	recursive = js_get(js, opt, "recursive") == js_true;
	jsval_t mode_val = js_get(js, opt, "mode");
	if (vtype(mode_val) == T_NUM) mode = (int)js_getnum(mode_val);
	break;
	}
	}
	}

	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_MKDIR;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->recursive = recursive;
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_mkdir(uv_default_loop(), &req->uv_req, req->path, mode, on_mkdir_complete);

	if (result < 0) {
	if (recursive && result == UV_EEXIST) {
	req->completed = 1;
	complete_request(req);
	} else {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}
	}

	return req->promise;
	}

	static jsval_t builtin_fs_rmdirSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "rmdirSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "rmdirSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	#ifdef _WIN32
	int result = _rmdir(path_cstr);
	#else
	int result = rmdir(path_cstr);
	#endif
	free(path_cstr);

	if (result != 0) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to remove directory: %s", strerror(errno));
	return js_mkerr(js, "%s", err_msg);
	}

	return js_mkundef();
	}

	static jsval_t builtin_fs_rmdir(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "rmdir() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "rmdir() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_RMDIR;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_rmdir(uv_default_loop(), &req->uv_req, req->path, on_rmdir_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t stat_isFile(ant_t js, jsval_t args, int nargs) {
	jsval_t this = js_getthis(js);
	jsval_t mode_val = js_get_slot(js, this, SLOT_DATA);

	if (vtype(mode_val) != T_NUM) return js_false;
	mode_t mode = (mode_t)js_getnum(mode_val);

	return js_bool(S_ISREG(mode));
	}

	static jsval_t stat_isDirectory(ant_t js, jsval_t args, int nargs) {
	jsval_t this = js_getthis(js);
	jsval_t mode_val = js_get_slot(js, this, SLOT_DATA);

	if (vtype(mode_val) != T_NUM) return js_false;
	mode_t mode = (mode_t)js_getnum(mode_val);

	return js_bool(S_ISDIR(mode));
	}

	static jsval_t stat_isSymbolicLink(ant_t js, jsval_t args, int nargs) {
	jsval_t this = js_getthis(js);
	jsval_t mode_val = js_get_slot(js, this, SLOT_DATA);

	if (vtype(mode_val) != T_NUM) return js_false;
	mode_t mode = (mode_t)js_getnum(mode_val);

	return js_bool(S_ISLNK(mode));
	}

	static jsval_t create_stats_object(ant_t js, struct stat st) {
	jsval_t stat_obj = js_mkobj(js);
	jsval_t proto = js_get_ctor_proto(js, "Stats", 5);
	if (is_special_object(proto)) js_set_proto(js, stat_obj, proto);

	js_set_slot(js, stat_obj, SLOT_DATA, js_mknum((double)st->st_mode));
	js_set(js, stat_obj, "size", js_mknum((double)st->st_size));
	js_set(js, stat_obj, "mode", js_mknum((double)st->st_mode));
	js_set(js, stat_obj, "uid", js_mknum((double)st->st_uid));
	js_set(js, stat_obj, "gid", js_mknum((double)st->st_gid));

	return stat_obj;
	}

	static const char *errno_to_code(int err_num) {
	switch (err_num) {
	case ENOENT: return "ENOENT";
	case EACCES: return "EACCES";
	case ENOTDIR: return "ENOTDIR";
	case ELOOP: return "ELOOP";
	case ENAMETOOLONG: return "ENAMETOOLONG";
	case EOVERFLOW: return "EOVERFLOW";
	case EROFS: return "EROFS";
	case ETXTBSY: return "ETXTBSY";
	case EEXIST: return "EEXIST";
	case ENOTEMPTY: return "ENOTEMPTY";
	case EISDIR: return "EISDIR";
	case EBUSY: return "EBUSY";
	case EINVAL: return "EINVAL";
	case EPERM: return "EPERM";
	case EIO: return "EIO";
	default: return "UNKNOWN";
	}
	}

	static jsval_t builtin_fs_statSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "statSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "statSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	struct stat st;
	int result = stat(path_cstr, &st);

	if (result != 0) {
	const char *code = errno_to_code(errno);
	jsval_t err = fs_err_code(js, code, "stat", path_cstr);
	free(path_cstr); return err;
	}

	free(path_cstr);
	return create_stats_object(js, &st);
	}

	static jsval_t builtin_fs_stat(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "stat() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "stat() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_STAT;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_stat(uv_default_loop(), &req->uv_req, req->path, on_stat_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_existsSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "existsSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "existsSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	struct stat st;
	int result = stat(path_cstr, &st);
	free(path_cstr);

	return js_bool(result == 0);
	}

	static jsval_t builtin_fs_exists(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "exists() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "exists() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_EXISTS;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_stat(uv_default_loop(), &req->uv_req, req->path, on_exists_complete);

	if (result < 0) {
	req->completed = 1;
	js_resolve_promise(req->js, req->promise, js_false);
	remove_pending_request(req);
	free_fs_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_accessSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "accessSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "accessSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	int mode = F_OK;
	if (nargs >= 2 && vtype(args[1]) == T_NUM) {
	mode = (int)js_getnum(args[1]);
	}

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");
	int result = access(path_cstr, mode);

	if (result != 0) {
	const char *code = errno_to_code(errno);
	jsval_t err = fs_err_code(js, code, "access", path_cstr);
	free(path_cstr); return err;
	}

	free(path_cstr);
	return js_mkundef();
	}

	static jsval_t builtin_fs_access(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "access() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "access() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	int mode = F_OK;
	if (nargs >= 2 && vtype(args[1]) == T_NUM) {
	mode = (int)js_getnum(args[1]);
	}


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_ACCESS;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_access(uv_default_loop(), &req->uv_req, req->path, mode, on_access_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_readdirSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "readdirSync() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "readdirSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	uv_fs_t req;
	int result = uv_fs_scandir(NULL, &req, path_cstr, 0, NULL);
	free(path_cstr);

	if (result < 0) {
	char err_msg[256];
	snprintf(err_msg, sizeof(err_msg), "Failed to read directory: %s", uv_strerror(result));
	uv_fs_req_cleanup(&req); return js_mkerr(js, "%s", err_msg);
	}

	jsval_t arr = js_mkarr(js);
	uv_dirent_t dirent;

	while (uv_fs_scandir_next(&req, &dirent) != UV_EOF) {
	jsval_t name = js_mkstr(js, dirent.name, strlen(dirent.name));
	js_arr_push(js, arr, name);
	}

	uv_fs_req_cleanup(&req);
	return arr;
	}

	static jsval_t builtin_fs_readdir(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "readdir() requires a path argument");

	if (vtype(args[0]) != T_STR) return js_mkerr(js, "readdir() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");


	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_READDIR;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_scandir(uv_default_loop(), &req->uv_req, req->path, 0, on_readdir_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static void on_write_fd_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, js_mknum((double)uv_req->result));
	remove_pending_request(req);
	free_fs_request(req);
	}

	static jsval_t builtin_fs_readSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "readSync() requires fd and buffer arguments");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "readSync() fd must be a number");

	int fd = (int)js_getnum(args[0]);

	jsval_t ta_data_val = js_get_slot(js, args[1], SLOT_BUFFER);
	TypedArrayData ta_data = (TypedArrayData )js_gettypedarray(ta_data_val);
	if (!ta_data \|\| !ta_data->buffer \|\| !ta_data->buffer->data)
	return js_mkerr(js, "readSync() second argument must be a Buffer, TypedArray, or DataView");

	uint8_t *buf_data = ta_data->buffer->data + ta_data->byte_offset;
	size_t buf_len = ta_data->byte_length;
	size_t offset = 0;
	size_t length = buf_len;
	int64_t position = -1;

	if (nargs >= 3) {
	if (vtype(args[2]) == T_OBJ) {
	jsval_t off_val = js_get(js, args[2], "offset");
	jsval_t len_val = js_get(js, args[2], "length");
	jsval_t pos_val = js_get(js, args[2], "position");
	if (vtype(off_val) == T_NUM) offset = (size_t)js_getnum(off_val);
	if (vtype(len_val) == T_NUM) length = (size_t)js_getnum(len_val);
	else length = buf_len - offset;
	if (vtype(pos_val) == T_NUM) position = (int64_t)js_getnum(pos_val);
	} else if (vtype(args[2]) == T_NUM) {
	offset = (size_t)js_getnum(args[2]);
	length = buf_len - offset;
	if (nargs >= 4 && vtype(args[3]) == T_NUM) length = (size_t)js_getnum(args[3]);
	if (nargs >= 5 && vtype(args[4]) == T_NUM) position = (int64_t)js_getnum(args[4]);
	}
	}

	if (offset > buf_len) return js_mkerr(js, "offset is out of bounds");
	if (offset + length > buf_len) return js_mkerr(js, "length extends beyond buffer");

	uv_fs_t req;
	uv_buf_t buf = uv_buf_init((char *)(buf_data + offset), (unsigned int)length);
	int result = uv_fs_read(uv_default_loop(), &req, fd, &buf, 1, position, NULL);
	uv_fs_req_cleanup(&req);

	if (result < 0) return js_mkerr(js, "readSync failed: %s", uv_strerror(result));
	return js_mknum((double)result);
	}

	static jsval_t builtin_fs_writeSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "writeSync() requires fd and data arguments");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "writeSync() fd must be a number");

	int fd = (int)js_getnum(args[0]);

	if (vtype(args[1]) == T_STR) {
	size_t str_len;
	const char *str = js_getstr(js, args[1], &str_len);
	if (!str) return js_mkerr(js, "Failed to get string");

	int64_t position = -1;
	if (nargs >= 3 && vtype(args[2]) == T_NUM)
	position = (int64_t)js_getnum(args[2]);

	uv_fs_t req;
	uv_buf_t buf = uv_buf_init((char *)str, (unsigned int)str_len);
	int result = uv_fs_write(uv_default_loop(), &req, fd, &buf, 1, position, NULL);
	uv_fs_req_cleanup(&req);

	if (result < 0) return js_mkerr(js, "writeSync failed: %s", uv_strerror(result));
	return js_mknum((double)result);
	}

	jsval_t ta_data_val = js_get_slot(js, args[1], SLOT_BUFFER);
	TypedArrayData ta_data = (TypedArrayData )js_gettypedarray(ta_data_val);
	if (!ta_data \|\| !ta_data->buffer \|\| !ta_data->buffer->data)
	return js_mkerr(js, "writeSync() second argument must be a Buffer, TypedArray, DataView, or string");

	uint8_t *buf_data = ta_data->buffer->data + ta_data->byte_offset;
	size_t buf_len = ta_data->byte_length;
	size_t offset = 0;
	size_t length = buf_len;
	int64_t position = -1;

	if (nargs >= 3) {
	if (vtype(args[2]) == T_OBJ) {
	jsval_t off_val = js_get(js, args[2], "offset");
	jsval_t len_val = js_get(js, args[2], "length");
	jsval_t pos_val = js_get(js, args[2], "position");
	if (vtype(off_val) == T_NUM) offset = (size_t)js_getnum(off_val);
	if (vtype(len_val) == T_NUM) length = (size_t)js_getnum(len_val);
	else length = buf_len - offset;
	if (vtype(pos_val) == T_NUM) position = (int64_t)js_getnum(pos_val);
	} else if (vtype(args[2]) == T_NUM) {
	offset = (size_t)js_getnum(args[2]);
	length = buf_len - offset;
	if (nargs >= 4 && vtype(args[3]) == T_NUM) length = (size_t)js_getnum(args[3]);
	if (nargs >= 5 && vtype(args[4]) == T_NUM) position = (int64_t)js_getnum(args[4]);
	}
	}

	if (offset > buf_len) return js_mkerr(js, "offset is out of bounds");
	if (offset + length > buf_len) return js_mkerr(js, "length extends beyond buffer");

	uv_fs_t req;
	uv_buf_t buf = uv_buf_init((char *)(buf_data + offset), (unsigned int)length);
	int result = uv_fs_write(uv_default_loop(), &req, fd, &buf, 1, position, NULL);
	uv_fs_req_cleanup(&req);

	if (result < 0) return js_mkerr(js, "writeSync failed: %s", uv_strerror(result));
	return js_mknum((double)result);
	}

	static jsval_t builtin_fs_write_fd(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "write() requires fd and data arguments");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "write() fd must be a number");

	int fd = (int)js_getnum(args[0]);
	const char *write_data;
	size_t write_len;
	int64_t position = -1;

	if (vtype(args[1]) == T_STR) {
	size_t str_len;
	const char *str = js_getstr(js, args[1], &str_len);
	if (!str) return js_mkerr(js, "Failed to get string");

	if (nargs >= 3 && vtype(args[2]) == T_NUM)
	position = (int64_t)js_getnum(args[2]);

	write_data = str;
	write_len = str_len;
	} else {
	jsval_t ta_data_val = js_get_slot(js, args[1], SLOT_BUFFER);
	TypedArrayData ta_data = (TypedArrayData )js_gettypedarray(ta_data_val);
	if (!ta_data \|\| !ta_data->buffer \|\| !ta_data->buffer->data)
	return js_mkerr(js, "write() second argument must be a Buffer, TypedArray, DataView, or string");

	uint8_t *buf_data = ta_data->buffer->data + ta_data->byte_offset;
	size_t buf_len = ta_data->byte_length;
	size_t offset = 0;
	size_t length = buf_len;

	if (nargs >= 3) {
	if (vtype(args[2]) == T_OBJ) {
	jsval_t off_val = js_get(js, args[2], "offset");
	jsval_t len_val = js_get(js, args[2], "length");
	jsval_t pos_val = js_get(js, args[2], "position");
	if (vtype(off_val) == T_NUM) offset = (size_t)js_getnum(off_val);
	if (vtype(len_val) == T_NUM) length = (size_t)js_getnum(len_val);
	else length = buf_len - offset;
	if (vtype(pos_val) == T_NUM) position = (int64_t)js_getnum(pos_val);
	} else if (vtype(args[2]) == T_NUM) {
	offset = (size_t)js_getnum(args[2]);
	length = buf_len - offset;
	if (nargs >= 4 && vtype(args[3]) == T_NUM) length = (size_t)js_getnum(args[3]);
	if (nargs >= 5 && vtype(args[4]) == T_NUM) position = (int64_t)js_getnum(args[4]);
	}
	}

	if (offset > buf_len) return js_mkerr(js, "offset is out of bounds");
	if (offset + length > buf_len) return js_mkerr(js, "length extends beyond buffer");

	write_data = (const char *)(buf_data + offset);
	write_len = length;
	}

	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_WRITE_FD;
	req->promise = js_mkpromise(js);
	req->fd = fd;
	req->data = malloc(write_len);
	if (!req->data) {
	free(req);
	return js_mkerr(js, "Out of memory");
	}
	memcpy(req->data, write_data, write_len);
	req->data_len = write_len;
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);

	uv_buf_t buf = uv_buf_init(req->data, (unsigned int)req->data_len);
	int result = uv_fs_write(uv_default_loop(), &req->uv_req, req->fd, &buf, 1, position, on_write_fd_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static jsval_t builtin_fs_writevSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "writevSync() requires fd and buffers arguments");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "writevSync() fd must be a number");

	int fd = (int)js_getnum(args[0]);
	jsoff_t arr_len = js_arr_len(js, args[1]);
	if (arr_len == 0) return js_mknum(0);

	int64_t position = -1;
	if (nargs >= 3 && vtype(args[2]) == T_NUM)
	position = (int64_t)js_getnum(args[2]);

	uv_buf_t *bufs = calloc((size_t)arr_len, sizeof(uv_buf_t));
	if (!bufs) return js_mkerr(js, "Out of memory");

	for (jsoff_t i = 0; i < arr_len; i++) {
	jsval_t item = js_arr_get(js, args[1], i);
	jsval_t ta_val = js_get_slot(js, item, SLOT_BUFFER);
	TypedArrayData ta = (TypedArrayData )js_gettypedarray(ta_val);
	if (!ta \|\| !ta->buffer \|\| !ta->buffer->data) {
	free(bufs);
	return js_mkerr(js, "writevSync() buffers must contain ArrayBufferViews");
	}
	bufs[i] = uv_buf_init((char *)(ta->buffer->data + ta->byte_offset), (unsigned int)ta->byte_length);
	}

	uv_fs_t req;
	int result = uv_fs_write(uv_default_loop(), &req, fd, bufs, (unsigned int)arr_len, position, NULL);
	uv_fs_req_cleanup(&req);
	free(bufs);

	if (result < 0) return js_mkerr(js, "writevSync failed: %s", uv_strerror(result));
	return js_mknum((double)result);
	}

	static jsval_t builtin_fs_writev_fd(ant_t js, jsval_t args, int nargs) {
	if (nargs < 2) return js_mkerr(js, "writev() requires fd and buffers arguments");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "writev() fd must be a number");

	int fd = (int)js_getnum(args[0]);
	jsoff_t arr_len = js_arr_len(js, args[1]);

	if (arr_len == 0) {
	jsval_t promise = js_mkpromise(js);
	js_resolve_promise(js, promise, js_mknum(0));
	return promise;
	}

	int64_t position = -1;
	if (nargs >= 3 && vtype(args[2]) == T_NUM)
	position = (int64_t)js_getnum(args[2]);

	size_t total_len = 0;
	for (jsoff_t i = 0; i < arr_len; i++) {
	jsval_t item = js_arr_get(js, args[1], i);
	jsval_t ta_val = js_get_slot(js, item, SLOT_BUFFER);
	TypedArrayData ta = (TypedArrayData )js_gettypedarray(ta_val);
	if (!ta \|\| !ta->buffer \|\| !ta->buffer->data)
	return js_mkerr(js, "writev() buffers must contain ArrayBufferViews");
	total_len += ta->byte_length;
	}

	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->data = malloc(total_len);
	if (!req->data) {
	free(req);
	return js_mkerr(js, "Out of memory");
	}

	size_t off = 0;
	for (jsoff_t i = 0; i < arr_len; i++) {
	jsval_t item = js_arr_get(js, args[1], i);
	jsval_t ta_val = js_get_slot(js, item, SLOT_BUFFER);
	TypedArrayData ta = (TypedArrayData )js_gettypedarray(ta_val);
	memcpy(req->data + off, ta->buffer->data + ta->byte_offset, ta->byte_length);
	off += ta->byte_length;
	}

	req->js = js;
	req->op_type = FS_OP_WRITE_FD;
	req->promise = js_mkpromise(js);
	req->fd = fd;
	req->data_len = total_len;
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);

	uv_buf_t buf = uv_buf_init(req->data, (unsigned int)total_len);
	int result = uv_fs_write(uv_default_loop(), &req->uv_req, req->fd, &buf, 1, position, on_write_fd_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static int parse_open_flags(ant_t *js, jsval_t arg) {
	if (vtype(arg) == T_NUM) return (int)js_getnum(arg);
	if (vtype(arg) != T_STR) return O_RDONLY;

	size_t len;
	const char *str = js_getstr(js, arg, &len);
	if (!str) return O_RDONLY;

	if (len == 1 && str[0] == 'r') return O_RDONLY;
	if (len == 2 && memcmp(str, "r+", 2) == 0) return O_RDWR;
	if (len == 1 && str[0] == 'w') return O_WRONLY \| O_CREAT \| O_TRUNC;
	if (len == 2 && memcmp(str, "wx", 2) == 0) return O_WRONLY \| O_CREAT \| O_TRUNC \| O_EXCL;
	if (len == 2 && memcmp(str, "w+", 2) == 0) return O_RDWR \| O_CREAT \| O_TRUNC;
	if (len == 3 && memcmp(str, "wx+", 3) == 0) return O_RDWR \| O_CREAT \| O_TRUNC \| O_EXCL;
	if (len == 1 && str[0] == 'a') return O_WRONLY \| O_CREAT \| O_APPEND;
	if (len == 2 && memcmp(str, "ax", 2) == 0) return O_WRONLY \| O_CREAT \| O_APPEND \| O_EXCL;
	if (len == 2 && memcmp(str, "a+", 2) == 0) return O_RDWR \| O_CREAT \| O_APPEND;
	if (len == 3 && memcmp(str, "ax+", 3) == 0) return O_RDWR \| O_CREAT \| O_APPEND \| O_EXCL;

	return O_RDONLY;
	}

	static jsval_t builtin_fs_openSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "openSync() requires a path argument");
	if (vtype(args[0]) != T_STR) return js_mkerr(js, "openSync() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	int flags = (nargs >= 2) ? parse_open_flags(js, args[1]) : O_RDONLY;
	int mode = (nargs >= 3 && vtype(args[2]) == T_NUM) ? (int)js_getnum(args[2]) : 0666;

	char *path_cstr = strndup(path, path_len);
	if (!path_cstr) return js_mkerr(js, "Out of memory");

	uv_fs_t req;
	int result = uv_fs_open(uv_default_loop(), &req, path_cstr, flags, mode, NULL);
	uv_fs_req_cleanup(&req);
	free(path_cstr);

	if (result < 0) return js_mkerr(js, "openSync failed: %s", uv_strerror(result));
	return js_mknum((double)result);
	}

	static jsval_t builtin_fs_closeSync(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "closeSync() requires a fd argument");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "closeSync() fd must be a number");

	int fd = (int)js_getnum(args[0]);

	uv_fs_t req;
	int result = uv_fs_close(uv_default_loop(), &req, fd, NULL);
	uv_fs_req_cleanup(&req);

	if (result < 0) return js_mkerr(js, "closeSync failed: %s", uv_strerror(result));
	return js_mkundef();
	}

	static void on_open_fd_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, js_mknum((double)uv_req->result));
	remove_pending_request(req);
	free_fs_request(req);
	}

	static jsval_t builtin_fs_open_fd(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "open() requires a path argument");
	if (vtype(args[0]) != T_STR) return js_mkerr(js, "open() path must be a string");

	size_t path_len;
	char *path = js_getstr(js, args[0], &path_len);
	if (!path) return js_mkerr(js, "Failed to get path string");

	int flags = (nargs >= 2) ? parse_open_flags(js, args[1]) : O_RDONLY;
	int mode = (nargs >= 3 && vtype(args[2]) == T_NUM) ? (int)js_getnum(args[2]) : 0666;

	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_OPEN;
	req->promise = js_mkpromise(js);
	req->path = strndup(path, path_len);
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_open(uv_default_loop(), &req->uv_req, req->path, flags, mode, on_open_fd_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	static void on_close_fd_complete(uv_fs_t *uv_req) {
	fs_request_t req = (fs_request_t )uv_req->data;

	if (uv_req->result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror((int)uv_req->result));
	req->completed = 1;
	complete_request(req);
	return;
	}

	req->completed = 1;
	js_resolve_promise(req->js, req->promise, js_mkundef());
	remove_pending_request(req);
	free_fs_request(req);
	}

	static jsval_t builtin_fs_close_fd(ant_t js, jsval_t args, int nargs) {
	if (nargs < 1) return js_mkerr(js, "close() requires a fd argument");
	if (vtype(args[0]) != T_NUM) return js_mkerr(js, "close() fd must be a number");

	int fd = (int)js_getnum(args[0]);

	fs_request_t *req = calloc(1, sizeof(fs_request_t));
	if (!req) return js_mkerr(js, "Out of memory");

	req->js = js;
	req->op_type = FS_OP_CLOSE;
	req->promise = js_mkpromise(js);
	req->fd = fd;
	req->uv_req.data = req;

	utarray_push_back(pending_requests, &req);
	int result = uv_fs_close(uv_default_loop(), &req->uv_req, req->fd, on_close_fd_complete);

	if (result < 0) {
	req->failed = 1;
	req->error_msg = strdup(uv_strerror(result));
	req->completed = 1;
	complete_request(req);
	}

	return req->promise;
	}

	void init_fs_module(void) {
	utarray_new(pending_requests, &ut_ptr_icd);

	ant_t *js = rt->js;
	jsval_t glob = js->global;

	jsval_t stats_ctor = js_mkobj(js);
	jsval_t stats_proto = js_mkobj(js);

	js_set(js, stats_proto, "isFile", js_mkfun(stat_isFile));
	js_set(js, stats_proto, "isDirectory", js_mkfun(stat_isDirectory));
	js_set(js, stats_proto, "isSymbolicLink", js_mkfun(stat_isSymbolicLink));
	js_set_sym(js, stats_proto, get_toStringTag_sym(), js_mkstr(js, "Stats", 5));

	js_mkprop_fast(js, stats_ctor, "prototype", 9, stats_proto);
	js_mkprop_fast(js, stats_ctor, "name", 4, js_mkstr(js, "Stats", 5));
	js_set_descriptor(js, stats_ctor, "name", 4, 0);

	js_set(js, glob, "Stats", js_obj_to_func(stats_ctor));
	}

	static void fs_set_promise_methods(ant_t *js, jsval_t lib) {
	js_set(js, lib, "readFile", js_mkfun(builtin_fs_readFile));
	js_set(js, lib, "open", js_mkfun(builtin_fs_open_fd));
	js_set(js, lib, "close", js_mkfun(builtin_fs_close_fd));
	js_set(js, lib, "writeFile", js_mkfun(builtin_fs_writeFile));
	js_set(js, lib, "write", js_mkfun(builtin_fs_write_fd));
	js_set(js, lib, "writev", js_mkfun(builtin_fs_writev_fd));
	js_set(js, lib, "unlink", js_mkfun(builtin_fs_unlink));
	js_set(js, lib, "mkdir", js_mkfun(builtin_fs_mkdir));
	js_set(js, lib, "rmdir", js_mkfun(builtin_fs_rmdir));
	js_set(js, lib, "stat", js_mkfun(builtin_fs_stat));
	js_set(js, lib, "exists", js_mkfun(builtin_fs_exists));
	js_set(js, lib, "access", js_mkfun(builtin_fs_access));
	js_set(js, lib, "readdir", js_mkfun(builtin_fs_readdir));
	}

	static jsval_t fs_make_constants(ant_t *js) {
	jsval_t constants = js_mkobj(js);
	js_set(js, constants, "F_OK", js_mknum(F_OK));
	js_set(js, constants, "R_OK", js_mknum(R_OK));
	js_set(js, constants, "W_OK", js_mknum(W_OK));
	js_set(js, constants, "X_OK", js_mknum(X_OK));
	js_set(js, constants, "O_RDONLY", js_mknum(O_RDONLY));
	js_set(js, constants, "O_WRONLY", js_mknum(O_WRONLY));
	js_set(js, constants, "O_RDWR", js_mknum(O_RDWR));
	js_set(js, constants, "O_CREAT", js_mknum(O_CREAT));
	js_set(js, constants, "O_EXCL", js_mknum(O_EXCL));
	js_set(js, constants, "O_TRUNC", js_mknum(O_TRUNC));
	js_set(js, constants, "O_APPEND", js_mknum(O_APPEND));
	return constants;
	}

	static jsval_t builtin_fs_promises_getter(ant_t js, jsval_t args, int nargs) {
	jsval_t getter_fn = js_getcurrentfunc(js);
	jsval_t cached = js_get_slot(js, getter_fn, SLOT_DATA);
	if (is_object_type(cached)) return cached;

	jsval_t promises = fs_promises_library(js);
	js_set_slot(js, getter_fn, SLOT_DATA, promises);
	return promises;
	}

	jsval_t fs_library(ant_t *js) {
	jsval_t lib = js_mkobj(js);
	fs_set_promise_methods(js, lib);

	js_set(js, lib, "readFileSync", js_mkfun(builtin_fs_readFileSync));
	js_set(js, lib, "readSync", js_mkfun(builtin_fs_readSync));
	js_set(js, lib, "stream", js_mkfun(builtin_fs_readBytes));
	js_set(js, lib, "openSync", js_mkfun(builtin_fs_openSync));
	js_set(js, lib, "closeSync", js_mkfun(builtin_fs_closeSync));
	js_set(js, lib, "writeFileSync", js_mkfun(builtin_fs_writeFileSync));
	js_set(js, lib, "writeSync", js_mkfun(builtin_fs_writeSync));
	js_set(js, lib, "writevSync", js_mkfun(builtin_fs_writevSync));
	js_set(js, lib, "appendFileSync", js_mkfun(builtin_fs_appendFileSync));
	js_set(js, lib, "copyFileSync", js_mkfun(builtin_fs_copyFileSync));
	js_set(js, lib, "renameSync", js_mkfun(builtin_fs_renameSync));
	js_set(js, lib, "unlinkSync", js_mkfun(builtin_fs_unlinkSync));
	js_set(js, lib, "mkdirSync", js_mkfun(builtin_fs_mkdirSync));
	js_set(js, lib, "rmdirSync", js_mkfun(builtin_fs_rmdirSync));
	js_set(js, lib, "statSync", js_mkfun(builtin_fs_statSync));
	js_set(js, lib, "existsSync", js_mkfun(builtin_fs_existsSync));
	js_set(js, lib, "accessSync", js_mkfun(builtin_fs_accessSync));
	js_set(js, lib, "readdirSync", js_mkfun(builtin_fs_readdirSync));

	js_set_getter_desc(
	js, lib,
	"promises", 8,
	js_heavy_mkfun(js, builtin_fs_promises_getter, js_mkundef()),
	JS_DESC_E \| JS_DESC_C
	);

	js_set(js, lib, "constants", fs_make_constants(js));
	js_set_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "fs", 2));

	return lib;
	}

	jsval_t fs_promises_library(ant_t *js) {
	jsval_t lib = js_mkobj(js);

	fs_set_promise_methods(js, lib);
	js_set(js, lib, "constants", fs_make_constants(js));

	js_set_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "fs/promises", 11));
	return lib;
	}

	int has_pending_fs_ops(void) {
	return pending_requests && utarray_len(pending_requests) > 0;
	}

	void fs_gc_update_roots(GC_OP_VAL_ARGS) {
	if (!pending_requests) return;
	unsigned int len = utarray_len(pending_requests);
	for (unsigned int i = 0; i < len; i++) {
	fs_request_t reqp = (fs_request_t )utarray_eltptr(pending_requests, i);
	if (reqp && reqp) { op_val(ctx, &(reqp)->promise); }
	}
	}

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