util.c
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util.c
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	// TODO: split module into smaller files

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

	#include <ctype.h>
	#include <math.h>
	#include <stdbool.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	#include "ant.h"
	#include "internal.h"
	#include "esm/library.h"
	#include "silver/engine.h"

	#include "modules/buffer.h"
	#include "modules/date.h"
	#include "modules/json.h"
	#include "modules/symbol.h"
	#include "modules/util.h"
	#include "modules/abort.h"
	#include "modules/collections.h"

	typedef struct {
	char *buf;
	size_t len;
	size_t cap;
	} util_sb_t;

	typedef struct {
	const char *name;
	const char *open;
	const char *close;
	} util_style_entry_t;

	typedef enum {
	UTIL_PARSE_ARG_TYPE_BOOLEAN = 0,
	UTIL_PARSE_ARG_TYPE_STRING,
	} util_parse_arg_type_t;

	typedef struct {
	char *name;
	char short_name;
	util_parse_arg_type_t type;
	bool multiple;
	ant_value_t default_value;
	} util_parse_arg_option_t;

	// TODO: migrate to crprintf
	static const util_style_entry_t util_styles[] = {
	{"bold", "\x1b[1m", "\x1b[22m"},
	{"dim", "\x1b[2m", "\x1b[22m"},
	{"italic", "\x1b[3m", "\x1b[23m"},
	{"underline", "\x1b[4m", "\x1b[24m"},
	{"inverse", "\x1b[7m", "\x1b[27m"},
	{"hidden", "\x1b[8m", "\x1b[28m"},
	{"strikethrough", "\x1b[9m", "\x1b[29m"},
	{"black", "\x1b[30m", "\x1b[39m"},
	{"red", "\x1b[31m", "\x1b[39m"},
	{"green", "\x1b[32m", "\x1b[39m"},
	{"yellow", "\x1b[33m", "\x1b[39m"},
	{"blue", "\x1b[34m", "\x1b[39m"},
	{"magenta", "\x1b[35m", "\x1b[39m"},
	{"cyan", "\x1b[36m", "\x1b[39m"},
	{"white", "\x1b[37m", "\x1b[39m"},
	{"gray", "\x1b[90m", "\x1b[39m"},
	{"grey", "\x1b[90m", "\x1b[39m"},
	{"bgBlack", "\x1b[40m", "\x1b[49m"},
	{"bgRed", "\x1b[41m", "\x1b[49m"},
	{"bgGreen", "\x1b[42m", "\x1b[49m"},
	{"bgYellow", "\x1b[43m", "\x1b[49m"},
	{"bgBlue", "\x1b[44m", "\x1b[49m"},
	{"bgMagenta", "\x1b[45m", "\x1b[49m"},
	{"bgCyan", "\x1b[46m", "\x1b[49m"},
	{"bgWhite", "\x1b[47m", "\x1b[49m"},
	};

	static bool util_sb_reserve(util_sb_t *sb, size_t extra) {
	size_t need = sb->len + extra + 1;
	if (need <= sb->cap) return true;

	size_t next = sb->cap ? sb->cap : 128;
	while (next < need) next *= 2;

	char buf = (char )realloc(sb->buf, next);
	if (!buf) return false;

	sb->buf = buf;
	sb->cap = next;
	return true;
	}

	static bool util_sb_append_n(util_sb_t sb, const char s, size_t n) {
	if (n == 0) return true;
	if (!util_sb_reserve(sb, n)) return false;
	memcpy(sb->buf + sb->len, s, n);
	sb->len += n;
	sb->buf[sb->len] = '\0';
	return true;
	}

	static bool util_sb_append_c(util_sb_t *sb, char c) {
	if (!util_sb_reserve(sb, 1)) return false;
	sb->buf[sb->len++] = c;
	sb->buf[sb->len] = '\0';
	return true;
	}

	static bool util_sb_append_jsval(ant_t js, util_sb_t sb, ant_value_t v) {
	char cbuf[512];
	js_cstr_t cstr = js_to_cstr(js, v, cbuf, sizeof(cbuf));
	size_t len = strlen(cstr.ptr);
	bool ok = util_sb_append_n(sb, cstr.ptr, len);
	if (cstr.needs_free) free((void *)cstr.ptr);
	return ok;
	}

	static bool util_sb_append_json(ant_t js, util_sb_t sb, ant_value_t v) {
	ant_value_t json = json_stringify_value(js, v);
	if (vtype(json) != T_STR) {
	return util_sb_append_n(sb, "[Circular]", 10);
	}
	size_t len = 0;
	const char *s = js_getstr(js, json, &len);
	return s ? util_sb_append_n(sb, s, len) : util_sb_append_n(sb, "[Circular]", 10);
	}

	static bool util_set_named_value(
	ant_t *js,
	ant_value_t values,
	const char *name,
	ant_value_t value,
	bool multiple
	) {
	if (!multiple) {
	js_set(js, values, name, value);
	return !js->thrown_exists;
	}

	ant_value_t existing = js_get(js, values, name);
	if (is_err(existing)) return false;

	if (vtype(existing) == T_UNDEF) {
	ant_value_t arr = js_mkarr(js);
	js_arr_push(js, arr, value);
	js_set(js, values, name, arr);
	return !js->thrown_exists;
	}

	if (vtype(existing) == T_ARR) {
	js_arr_push(js, existing, value);
	return !js->thrown_exists;
	}

	ant_value_t arr = js_mkarr(js);
	js_arr_push(js, arr, existing);
	js_arr_push(js, arr, value);
	js_set(js, values, name, arr);
	return !js->thrown_exists;
	}

	static util_parse_arg_option_t *util_find_option_by_name(
	util_parse_arg_option_t *options,
	size_t option_count,
	const char *name
	) {
	for (size_t i = 0; i < option_count; i++) {
	if (strcmp(options[i].name, name) == 0) return &options[i];
	}
	return NULL;
	}

	static util_parse_arg_option_t *util_find_option_by_short(
	util_parse_arg_option_t *options,
	size_t option_count,
	char short_name
	) {
	for (size_t i = 0; i < option_count; i++) {
	if (options[i].short_name == short_name) return &options[i];
	}
	return NULL;
	}

	static void util_free_parse_options(util_parse_arg_option_t *options, size_t option_count) {
	if (!options) return;
	for (size_t i = 0; i < option_count; i++) free(options[i].name);
	free(options);
	}

	static ant_value_t util_parse_args(ant_t js, ant_value_t args, int nargs) {
	ant_value_t config = nargs > 0 ? args[0] : js_mkundef();
	if (!is_object_type(config)) {
	return js_mkerr_typed(js, JS_ERR_TYPE, "parseArgs(config) requires an options object");
	}

	ant_value_t args_list = js_get(js, config, "args");
	if (is_err(args_list)) return args_list;
	if (vtype(args_list) == T_UNDEF) {
	ant_value_t process_obj = js_get(js, js_glob(js), "process");
	if (is_err(process_obj)) return process_obj;
	args_list = js_get(js, process_obj, "argv");
	if (is_err(args_list)) return args_list;
	}

	ant_value_t options_obj = js_get(js, config, "options");
	if (is_err(options_obj)) return options_obj;
	if (!is_object_type(options_obj)) options_obj = js_mkobj(js);

	bool strict = js_truthy(js, js_get(js, config, "strict"));
	if (vtype(js_get(js, config, "strict")) == T_UNDEF) strict = true;
	bool allow_positionals = js_truthy(js, js_get(js, config, "allowPositionals"));

	size_t option_count = 0;
	{
	ant_iter_t iter = js_prop_iter_begin(js, options_obj);
	const char *key = NULL;
	size_t key_len = 0;
	while (js_prop_iter_next(&iter, &key, &key_len, NULL)) option_count++;
	js_prop_iter_end(&iter);
	}

	util_parse_arg_option_t *options = NULL;
	if (option_count > 0) {
	options = calloc(option_count, sizeof(*options));
	if (!options) return js_mkerr(js, "Out of memory");

	ant_iter_t iter = js_prop_iter_begin(js, options_obj);
	const char *key = NULL;
	size_t key_len = 0;
	size_t idx = 0;

	while (idx < option_count && js_prop_iter_next(&iter, &key, &key_len, NULL)) {
	ant_value_t spec = js_get(js, options_obj, key);
	ant_value_t type_val = is_object_type(spec) ? js_get(js, spec, "type") : js_mkundef();
	ant_value_t short_val = is_object_type(spec) ? js_get(js, spec, "short") : js_mkundef();
	ant_value_t multiple_val = is_object_type(spec) ? js_get(js, spec, "multiple") : js_mkundef();
	ant_value_t default_val = is_object_type(spec) ? js_get(js, spec, "default") : js_mkundef();

	options[idx].name = strndup(key, key_len);
	if (!options[idx].name) {
	js_prop_iter_end(&iter);
	util_free_parse_options(options, option_count);
	return js_mkerr(js, "Out of memory");
	}

	options[idx].type = UTIL_PARSE_ARG_TYPE_BOOLEAN;
	if (vtype(type_val) == T_STR) {
	size_t type_len = 0;
	const char *type_str = js_getstr(js, type_val, &type_len);
	if (type_str && type_len == 6 && memcmp(type_str, "string", 6) == 0) {
	options[idx].type = UTIL_PARSE_ARG_TYPE_STRING;
	}
	}

	if (vtype(short_val) == T_STR) {
	size_t short_len = 0;
	const char *short_str = js_getstr(js, short_val, &short_len);
	if (short_str && short_len > 0) options[idx].short_name = short_str[0];
	}

	options[idx].multiple = js_truthy(js, multiple_val);
	options[idx].default_value = default_val;
	idx++;
	}

	js_prop_iter_end(&iter);
	}

	ant_value_t values = js_mkobj(js);
	ant_value_t positionals = js_mkarr(js);
	ant_value_t out = js_mkobj(js);

	for (size_t i = 0; i < option_count; i++) {
	if (vtype(options[i].default_value) != T_UNDEF) {
	if (!util_set_named_value(js, values, options[i].name, options[i].default_value, options[i].multiple)) {
	util_free_parse_options(options, option_count);
	return js->thrown_exists ? js->thrown_value : js_mkerr(js, "parseArgs failed to set default");
	}}}

	ant_offset_t arg_len = js_arr_len(js, args_list);
	bool stop_parsing = false;

	for (ant_offset_t i = 0; i < arg_len; i++) {
	ant_value_t arg_val = js_arr_get(js, args_list, i);
	if (vtype(arg_val) != T_STR) continue;

	size_t arg_slen = 0;
	const char *arg = js_getstr(js, arg_val, &arg_slen);
	if (!arg) continue;

	if (stop_parsing) {
	js_arr_push(js, positionals, arg_val);
	continue;
	}

	if (arg_slen == 2 && memcmp(arg, "--", 2) == 0) {
	stop_parsing = true;
	continue;
	}

	if (arg_slen > 2 && arg[0] == '-' && arg[1] == '-') {
	const char *name = arg + 2;
	size_t name_len = arg_slen - 2;
	const char *inline_value = NULL;
	size_t inline_len = 0;
	const char *eq = memchr(name, '=', name_len);

	if (eq) {
	name_len = (size_t)(eq - name);
	inline_value = eq + 1;
	inline_len = (size_t)(arg + arg_slen - inline_value);
	}

	char *name_buf = strndup(name, name_len);
	if (!name_buf) {
	util_free_parse_options(options, option_count);
	return js_mkerr(js, "Out of memory");
	}

	util_parse_arg_option_t *opt = util_find_option_by_name(options, option_count, name_buf);
	if (!opt) {
	if (strict) {
	free(name_buf);
	util_free_parse_options(options, option_count);
	return js_mkerr_typed(js, JS_ERR_TYPE, "Unknown option '--%.*s'", (int)name_len, name);
	}

	ant_value_t unknown = inline_value
	? js_mkstr(js, inline_value, inline_len)
	: js_true;

	js_set(js, values, name_buf, unknown);
	free(name_buf);

	continue;
	}

	ant_value_t parsed_value = js_true;
	if (opt->type == UTIL_PARSE_ARG_TYPE_STRING) {
	if (inline_value) parsed_value = js_mkstr(js, inline_value, inline_len);
	else if (i + 1 < arg_len) parsed_value = js_arr_get(js, args_list, ++i);
	else {
	free(name_buf);
	util_free_parse_options(options, option_count);
	return js_mkerr_typed(js, JS_ERR_TYPE, "Option '--%s' requires a value", opt->name);
	}
	} else if (inline_value) parsed_value = js_mkstr(js, inline_value, inline_len);

	if (!util_set_named_value(js, values, opt->name, parsed_value, opt->multiple)) {
	free(name_buf);
	util_free_parse_options(options, option_count);
	return js->thrown_exists ? js->thrown_value : js_mkerr(js, "parseArgs failed");
	}

	free(name_buf);
	continue;
	}

	if (arg_slen > 1 && arg[0] == '-') {
	for (size_t j = 1; j < arg_slen; j++) {
	util_parse_arg_option_t *opt = util_find_option_by_short(options, option_count, arg[j]);
	if (!opt) {
	if (strict) {
	util_free_parse_options(options, option_count);
	return js_mkerr_typed(js, JS_ERR_TYPE, "Unknown option '-%c'", arg[j]);
	}
	char key[2] = {arg[j], '\0'};
	js_set(js, values, key, js_true);
	continue;
	}

	ant_value_t parsed_value = js_true;
	if (opt->type == UTIL_PARSE_ARG_TYPE_STRING) {
	if (j + 1 < arg_slen) {
	parsed_value = js_mkstr(js, arg + j + 1, arg_slen - (j + 1));
	j = arg_slen;
	} else if (i + 1 < arg_len) {
	parsed_value = js_arr_get(js, args_list, ++i);
	j = arg_slen;
	} else {
	util_free_parse_options(options, option_count);
	return js_mkerr_typed(js, JS_ERR_TYPE, "Option '-%c' requires a value", arg[j]);
	}
	}

	if (!util_set_named_value(js, values, opt->name, parsed_value, opt->multiple)) {
	util_free_parse_options(options, option_count);
	return js->thrown_exists ? js->thrown_value : js_mkerr(js, "parseArgs failed");
	}

	if (opt->type == UTIL_PARSE_ARG_TYPE_STRING) break;
	}
	continue;
	}

	if (!allow_positionals) {
	util_free_parse_options(options, option_count);
	return js_mkerr_typed(js, JS_ERR_TYPE, "Unexpected positional argument '%s'", arg);
	}
	js_arr_push(js, positionals, arg_val);
	}

	util_free_parse_options(options, option_count);
	js_set(js, out, "values", values);
	js_set(js, out, "positionals", positionals);

	return out;
	}

	static ant_value_t util_format_impl(ant_t js, ant_value_t args, int nargs, int fmt_index) {
	util_sb_t sb = {0};
	if (fmt_index >= nargs) {
	ant_value_t out = js_mkstr(js, "", 0);
	free(sb.buf);
	return out;
	}

	if (vtype(args[fmt_index]) != T_STR) {
	for (int i = fmt_index; i < nargs; i++) {
	if (i > fmt_index) util_sb_append_c(&sb, ' ');
	util_sb_append_jsval(js, &sb, args[i]);
	}
	ant_value_t out = js_mkstr(js, sb.buf ? sb.buf : "", sb.len);
	free(sb.buf);
	return out;
	}

	size_t fmt_len = 0;
	const char *fmt = js_getstr(js, args[fmt_index], &fmt_len);
	int argi = fmt_index + 1;

	for (size_t i = 0; i < fmt_len; i++) {
	if (fmt[i] != '%' \|\| i + 1 >= fmt_len) {
	util_sb_append_c(&sb, fmt[i]);
	continue;
	}

	char spec = fmt[i + 1];
	if (spec == '%') {
	util_sb_append_c(&sb, '%');
	i++;
	continue;
	}

	bool known = (
	spec == 's' \|\| spec == 'd' \|\| spec == 'i' \|\| spec == 'f' \|\|
	spec == 'j' \|\| spec == 'o' \|\| spec == 'O' \|\| spec == 'c'
	);

	if (!known) {
	util_sb_append_c(&sb, '%');
	util_sb_append_c(&sb, spec);
	i++;
	continue;
	}

	ant_value_t v = (argi < nargs) ? args[argi++] : js_mkundef();

	if (spec == 's') {
	util_sb_append_jsval(js, &sb, v);
	} else if (spec == 'd' \|\| spec == 'i') {
	double d = js_to_number(js, v);
	char nb[64];
	if (isnan(d)) snprintf(nb, sizeof(nb), "NaN");
	else if (!isfinite(d)) snprintf(nb, sizeof(nb), d < 0 ? "-Infinity" : "Infinity");
	else snprintf(nb, sizeof(nb), "%lld", (long long)d);
	util_sb_append_n(&sb, nb, strlen(nb));
	} else if (spec == 'f') {
	double d = js_to_number(js, v);
	char nb[64];
	if (isnan(d)) snprintf(nb, sizeof(nb), "NaN");
	else if (!isfinite(d)) snprintf(nb, sizeof(nb), d < 0 ? "-Infinity" : "Infinity");
	else snprintf(nb, sizeof(nb), "%g", d);
	util_sb_append_n(&sb, nb, strlen(nb));
	} else if (spec == 'j') {
	util_sb_append_json(js, &sb, v);
	} else if (spec == 'o' \|\| spec == 'O') {
	util_sb_append_jsval(js, &sb, v);
	} else if (spec == 'c') {
	// style placeholder: consume arg, emit nothing.
	}

	i++;
	}

	for (; argi < nargs; argi++) {
	util_sb_append_c(&sb, ' ');
	util_sb_append_jsval(js, &sb, args[argi]);
	}

	ant_value_t out = js_mkstr(js, sb.buf ? sb.buf : "", sb.len);
	free(sb.buf);
	return out;
	}

	static ant_value_t util_format(ant_t js, ant_value_t args, int nargs) {
	return util_format_impl(js, args, nargs, 0);
	}

	static ant_value_t util_format_with_options(ant_t js, ant_value_t args, int nargs) {
	if (nargs <= 1) return js_mkstr(js, "", 0);
	return util_format_impl(js, args, nargs, 1);
	}

	static ant_value_t util_inspect(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkstr(js, "undefined", 9);
	char cbuf[512];
	js_cstr_t cstr = js_to_cstr(js, args[0], cbuf, sizeof(cbuf));
	ant_value_t out = js_mkstr(js, cstr.ptr, strlen(cstr.ptr));
	if (cstr.needs_free) free((void *)cstr.ptr);
	return out;
	}

	static bool util_has_proto_in_chain(ant_t *js, ant_value_t value, ant_value_t proto) {
	if (!is_special_object(proto)) return false;

	ant_value_t current = value;
	while (is_special_object(current)) {
	current = js_get_proto(js, current);
	if (current == proto) return true;
	}

	return false;
	}

	static bool util_is_boxed_primitive(ant_value_t value, uint8_t *type_out) {
	ant_value_t primitive;

	if (!is_object_type(value)) return false;
	primitive = js_get_slot(value, SLOT_PRIMITIVE);
	if (vtype(primitive) == T_UNDEF) return false;

	if (type_out) *type_out = vtype(primitive);
	return true;
	}

	static bool util_has_to_string_tag(ant_t js, ant_value_t value, const char tag, size_t tag_len) {
	ant_value_t to_string_tag;
	size_t actual_len = 0;
	const char *actual;

	if (!is_object_type(value)) return false;

	to_string_tag = js_get_sym(js, value, get_toStringTag_sym());
	if (vtype(to_string_tag) != T_STR) return false;

	actual = js_getstr(js, to_string_tag, &actual_len);
	return actual != NULL && actual_len == tag_len && memcmp(actual, tag, tag_len) == 0;
	}

	static bool util_is_arguments_object_value(ant_t *js, ant_value_t value) {
	ant_value_t callee = js_mkundef();

	if (vtype(value) != T_ARR) return false;
	if (js_get_slot(value, SLOT_STRICT_ARGS) == js_true) return true;
	if (!util_has_to_string_tag(js, value, "Arguments", 9)) return false;

	return js_try_get_own_data_prop(js, value, "callee", 6, &callee);
	}

	static ant_value_t util_types_is_any_array_buffer(ant_t js, ant_value_t args, int nargs) {
	ArrayBufferData *buffer = (nargs > 0) ? buffer_get_arraybuffer_data(args[0]) : NULL;
	return js_bool(buffer != NULL);
	}

	static ant_value_t util_types_is_array_buffer(ant_t js, ant_value_t args, int nargs) {
	ArrayBufferData *buffer = (nargs > 0) ? buffer_get_arraybuffer_data(args[0]) : NULL;
	return js_bool(buffer != NULL && !buffer->is_shared);
	}

	static ant_value_t util_types_is_shared_array_buffer(ant_t js, ant_value_t args, int nargs) {
	ArrayBufferData *buffer = (nargs > 0) ? buffer_get_arraybuffer_data(args[0]) : NULL;
	return js_bool(buffer != NULL && buffer->is_shared);
	}

	static ant_value_t util_types_is_array_buffer_view(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(buffer_is_dataview(args[0]) \|\| buffer_get_typedarray_data(args[0]) != NULL);
	}

	static ant_value_t util_types_is_data_view(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(buffer_is_dataview(args[0]));
	}

	static ant_value_t util_types_is_typed_array(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(buffer_get_typedarray_data(args[0]) != NULL);
	}

	static ant_value_t util_types_is_float16_array(ant_t js, ant_value_t args, int nargs) {
	TypedArrayData *typed_array = (nargs > 0) ? buffer_get_typedarray_data(args[0]) : NULL;
	if (!typed_array) return js_false;
	return js_bool(typed_array != NULL && typed_array->type == TYPED_ARRAY_FLOAT16);
	}

	#define DEFINE_TYPED_ARRAY_CHECK(fn_name, typed_array_kind) \
	static ant_value_t fn_name(ant_t js, ant_value_t args, int nargs) { \
	TypedArrayData *typed_array = (nargs > 0) ? buffer_get_typedarray_data(args[0]) : NULL; \
	if (!typed_array) return js_false; \
	return js_bool(typed_array != NULL && typed_array->type == typed_array_kind); \
	}

	DEFINE_TYPED_ARRAY_CHECK(util_types_is_int8_array, TYPED_ARRAY_INT8)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_uint8_array, TYPED_ARRAY_UINT8)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_int16_array, TYPED_ARRAY_INT16)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_uint16_array, TYPED_ARRAY_UINT16)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_int32_array, TYPED_ARRAY_INT32)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_uint32_array, TYPED_ARRAY_UINT32)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_float32_array, TYPED_ARRAY_FLOAT32)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_float64_array, TYPED_ARRAY_FLOAT64)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_bigint64_array, TYPED_ARRAY_BIGINT64)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_biguint64_array, TYPED_ARRAY_BIGUINT64)
	DEFINE_TYPED_ARRAY_CHECK(util_types_is_uint8_clamped_array, TYPED_ARRAY_UINT8_CLAMPED)

	static ant_value_t util_types_is_promise(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(vtype(args[0]) == T_PROMISE);
	}

	static ant_value_t util_types_is_proxy(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	return js_bool(is_proxy(args[0]));
	}

	static ant_value_t util_types_is_regexp(ant_t js, ant_value_t args, int nargs) {
	ant_value_t regexp_proto;
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	regexp_proto = js_get_ctor_proto(js, "RegExp", 6);
	return js_bool(util_has_proto_in_chain(js, args[0], regexp_proto));
	}

	static ant_value_t util_types_is_date(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(is_date_instance(args[0]));
	}

	static ant_value_t util_types_is_map(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) return js_false;
	return js_bool(js_obj_ptr(args[0])->type_tag == T_MAP);
	}

	static ant_value_t util_types_is_set(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) return js_false;
	return js_bool(js_obj_ptr(args[0])->type_tag == T_SET);
	}

	static ant_value_t util_types_is_weak_map(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) return js_false;
	return js_bool(js_obj_ptr(args[0])->type_tag == T_WEAKMAP);
	}

	static ant_value_t util_types_is_weak_set(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| vtype(args[0]) != T_OBJ) return js_false;
	return js_bool(js_obj_ptr(args[0])->type_tag == T_WEAKSET);
	}

	static ant_value_t util_types_is_async_function(ant_t js, ant_value_t args, int nargs) {
	ant_value_t func_obj;
	if (nargs < 1 \|\| vtype(args[0]) != T_FUNC) return js_false;
	func_obj = js_func_obj(args[0]);
	return js_bool(js_get_slot(func_obj, SLOT_ASYNC) == js_true);
	}

	static ant_value_t util_types_is_generator_function(ant_t js, ant_value_t args, int nargs) {
	sv_closure_t *closure;

	if (nargs < 1 \|\| vtype(args[0]) != T_FUNC) return js_false;

	closure = js_func_closure(args[0]);
	return js_bool(closure != NULL && closure->func != NULL && closure->func->is_generator);
	}

	static ant_value_t util_types_is_generator_object(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(vtype(args[0]) == T_GENERATOR);
	}

	static ant_value_t util_types_is_arguments_object(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(util_is_arguments_object_value(js, args[0]));
	}

	static ant_value_t util_types_is_native_error(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	return js_bool(js_get_slot(args[0], SLOT_ERROR_BRAND) == js_true);
	}

	static ant_value_t util_types_is_boxed_primitive(ant_t js, ant_value_t args, int nargs) {
	return js_bool(nargs > 0 && util_is_boxed_primitive(args[0], NULL));
	}

	static ant_value_t util_types_is_boolean_object(ant_t js, ant_value_t args, int nargs) {
	uint8_t type = T_UNDEF;
	return js_bool(nargs > 0 && util_is_boxed_primitive(args[0], &type) && type == T_BOOL);
	}

	static ant_value_t util_types_is_number_object(ant_t js, ant_value_t args, int nargs) {
	uint8_t type = T_UNDEF;
	return js_bool(nargs > 0 && util_is_boxed_primitive(args[0], &type) && type == T_NUM);
	}

	static ant_value_t util_types_is_string_object(ant_t js, ant_value_t args, int nargs) {
	uint8_t type = T_UNDEF;
	return js_bool(nargs > 0 && util_is_boxed_primitive(args[0], &type) && type == T_STR);
	}

	static ant_value_t util_types_is_symbol_object(ant_t js, ant_value_t args, int nargs) {
	uint8_t type = T_UNDEF;
	return js_bool(nargs > 0 && util_is_boxed_primitive(args[0], &type) && type == T_SYMBOL);
	}

	static ant_value_t util_types_is_bigint_object(ant_t js, ant_value_t args, int nargs) {
	uint8_t type = T_UNDEF;
	return js_bool(nargs > 0 && util_is_boxed_primitive(args[0], &type) && type == T_BIGINT);
	}

	static ant_value_t util_types_is_map_iterator(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	return js_bool(util_has_proto_in_chain(js, args[0], g_map_iter_proto));
	}

	static ant_value_t util_types_is_set_iterator(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_object_type(args[0])) return js_false;
	return js_bool(util_has_proto_in_chain(js, args[0], g_set_iter_proto));
	}

	static ant_value_t util_types_is_module_namespace_object(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_false;
	return js_bool(js_check_brand(args[0], BRAND_MODULE_NAMESPACE));
	}

	ant_value_t util_types_library(ant_t *js) {
	ant_value_t types = js_mkobj(js);

	js_set(js, types, "isAnyArrayBuffer", js_mkfun(util_types_is_any_array_buffer));
	js_set(js, types, "isArrayBuffer", js_mkfun(util_types_is_array_buffer));
	js_set(js, types, "isArgumentsObject", js_mkfun(util_types_is_arguments_object));
	js_set(js, types, "isArrayBufferView", js_mkfun(util_types_is_array_buffer_view));
	js_set(js, types, "isAsyncFunction", js_mkfun(util_types_is_async_function));
	js_set(js, types, "isBigInt64Array", js_mkfun(util_types_is_bigint64_array));
	js_set(js, types, "isBigIntObject", js_mkfun(util_types_is_bigint_object));
	js_set(js, types, "isBigUint64Array", js_mkfun(util_types_is_biguint64_array));
	js_set(js, types, "isBooleanObject", js_mkfun(util_types_is_boolean_object));
	js_set(js, types, "isBoxedPrimitive", js_mkfun(util_types_is_boxed_primitive));
	js_set(js, types, "isDataView", js_mkfun(util_types_is_data_view));
	js_set(js, types, "isDate", js_mkfun(util_types_is_date));
	js_set(js, types, "isFloat16Array", js_mkfun(util_types_is_float16_array));
	js_set(js, types, "isFloat32Array", js_mkfun(util_types_is_float32_array));
	js_set(js, types, "isFloat64Array", js_mkfun(util_types_is_float64_array));
	js_set(js, types, "isGeneratorFunction", js_mkfun(util_types_is_generator_function));
	js_set(js, types, "isGeneratorObject", js_mkfun(util_types_is_generator_object));
	js_set(js, types, "isInt8Array", js_mkfun(util_types_is_int8_array));
	js_set(js, types, "isInt16Array", js_mkfun(util_types_is_int16_array));
	js_set(js, types, "isInt32Array", js_mkfun(util_types_is_int32_array));
	js_set(js, types, "isMap", js_mkfun(util_types_is_map));
	js_set(js, types, "isMapIterator", js_mkfun(util_types_is_map_iterator));
	js_set(js, types, "isModuleNamespaceObject", js_mkfun(util_types_is_module_namespace_object));
	js_set(js, types, "isNativeError", js_mkfun(util_types_is_native_error));
	js_set(js, types, "isNumberObject", js_mkfun(util_types_is_number_object));
	js_set(js, types, "isPromise", js_mkfun(util_types_is_promise));
	js_set(js, types, "isProxy", js_mkfun(util_types_is_proxy));
	js_set(js, types, "isRegExp", js_mkfun(util_types_is_regexp));
	js_set(js, types, "isSet", js_mkfun(util_types_is_set));
	js_set(js, types, "isSetIterator", js_mkfun(util_types_is_set_iterator));
	js_set(js, types, "isSharedArrayBuffer", js_mkfun(util_types_is_shared_array_buffer));
	js_set(js, types, "isStringObject", js_mkfun(util_types_is_string_object));
	js_set(js, types, "isSymbolObject", js_mkfun(util_types_is_symbol_object));
	js_set(js, types, "isTypedArray", js_mkfun(util_types_is_typed_array));
	js_set(js, types, "isUint8Array", js_mkfun(util_types_is_uint8_array));
	js_set(js, types, "isUint8ClampedArray", js_mkfun(util_types_is_uint8_clamped_array));
	js_set(js, types, "isUint16Array", js_mkfun(util_types_is_uint16_array));
	js_set(js, types, "isUint32Array", js_mkfun(util_types_is_uint32_array));
	js_set(js, types, "isWeakMap", js_mkfun(util_types_is_weak_map));
	js_set(js, types, "isWeakSet", js_mkfun(util_types_is_weak_set));

	return types;
	}

	static ant_value_t util_get_types_object(ant_t *js) {
	bool loaded = false;
	ant_value_t types = js_esm_load_registered_library(js, "util/types", 10, &loaded);
	return loaded ? types : util_types_library(js);
	}

	static ant_value_t util_debuglog_call(ant_params_t) {
	return js_mkundef();
	}

	static ant_value_t util_debuglog(ant_params_t) {
	ant_value_t logger = js_mkfun(util_debuglog_call);
	js_set(js, logger, "enabled", js_false);

	if (nargs >= 2 && is_callable(args[1])) {
	ant_value_t cb_args[1] = { logger };
	ant_value_t result = sv_vm_call(js->vm, js, args[1], js_mkundef(), cb_args, 1, NULL, false);
	if (is_err(result) \|\| js->thrown_exists) return result;
	}

	return logger;
	}

	static ant_value_t util_strip_vt_control_characters(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1) return js_mkstr(js, "", 0);

	char cbuf[512];
	js_cstr_t cstr = js_to_cstr(js, args[0], cbuf, sizeof(cbuf));
	const char *src = cstr.ptr;
	size_t len = strlen(src);

	util_sb_t sb = {0};
	for (size_t i = 0; i < len; i++) {
	unsigned char ch = (unsigned char)src[i];
	if (ch != 0x1b) {
	util_sb_append_c(&sb, (char)ch);
	continue;
	}

	if (i + 1 < len && src[i + 1] == '[') {
	i += 2;
	while (i < len) {
	unsigned char c = (unsigned char)src[i];
	if (c >= '@' && c <= '~') break;
	i++;
	}
	continue;
	}

	if (i + 1 < len && src[i + 1] == ']') {
	i += 2;
	while (i < len) {
	if ((unsigned char)src[i] == 0x07) break;
	if ((unsigned char)src[i] == 0x1b && i + 1 < len && src[i + 1] == '\\') {
	i++;
	break;
	}
	i++;
	}
	continue;
	}
	}

	ant_value_t out = js_mkstr(js, sb.buf ? sb.buf : "", sb.len);
	if (cstr.needs_free) free((void *)cstr.ptr);
	free(sb.buf);
	return out;
	}

	static inline bool util_env_is_inline_ws(char ch) {
	return ch == ' ' \|\| ch == '\t' \|\| ch == '\r';
	}

	static inline bool util_env_is_ident_start(char ch) {
	return
	(ch >= 'A' && ch <= 'Z') \|\|
	(ch >= 'a' && ch <= 'z') \|\|
	ch == '_';
	}

	static inline bool util_env_is_ident_continue(char ch) {
	return util_env_is_ident_start(ch) \|\| (ch >= '0' && ch <= '9');
	}

	static void util_env_skip_inline_ws(const char src, size_t len, size_t cursor) {
	while (cursor < len && util_env_is_inline_ws(src[cursor])) (*cursor)++;
	}

	static void util_env_skip_line(const char src, size_t len, size_t cursor) {
	while (cursor < len && src[cursor] != '\n') (*cursor)++;
	if (cursor < len && src[cursor] == '\n') (*cursor)++;
	}

	static bool util_env_consume_export(const char src, size_t len, size_t cursor) {
	if (*cursor + 6 > len) return false;
	if (memcmp(src + *cursor, "export", 6) != 0) return false;

	if (
	*cursor + 6 < len &&
	!util_env_is_inline_ws(src[*cursor + 6]) &&
	src[*cursor + 6] != '\n'
	) return false;

	*cursor += 6;
	util_env_skip_inline_ws(src, len, cursor);
	return true;
	}

	static bool util_env_parse_key(
	const char src, size_t len, size_t cursor,
	size_t key_start, size_t key_end
	) {
	if (cursor >= len \|\| !util_env_is_ident_start(src[cursor])) return false;
	key_start = cursor; (*cursor)++;

	while (cursor < len && util_env_is_ident_continue(src[cursor])) (*cursor)++;
	key_end = cursor;

	return true;
	}

	static void util_env_set_entry(
	ant_t js, ant_value_t obj, const char key,
	size_t key_len, ant_value_t value
	) {
	ant_value_t key_str = js_mkstr(js, key, key_len);
	js_setprop(js, obj, key_str, value);
	}

	static ant_value_t util_env_parse_quoted_value(
	ant_t js, const char src,
	size_t len, size_t *cursor
	) {
	util_sb_t sb = {0};
	ant_value_t value = js_mkstr(js, "", 0);
	char quote;

	if (*cursor >= len) return value;
	quote = src[(*cursor)++];

	while (*cursor < len) {
	char ch = src[(*cursor)++];
	if (ch == quote) goto done;
	if (ch != '\\' \|\| *cursor >= len) {
	util_sb_append_c(&sb, ch);
	continue;
	}

	char esc = src[(*cursor)++];
	if (quote != '"') {
	util_sb_append_c(&sb, esc);
	continue;
	}

	switch (esc) {
	case 'n': util_sb_append_c(&sb, '\n'); break;
	case 'r': util_sb_append_c(&sb, '\r'); break;
	case 't': util_sb_append_c(&sb, '\t'); break;
	case '\\': util_sb_append_c(&sb, '\\'); break;
	case '"': util_sb_append_c(&sb, '"'); break;
	default: util_sb_append_c(&sb, esc); break;
	}
	}

	done:
	value = js_mkstr(js, sb.buf ? sb.buf : "", sb.len);
	free(sb.buf);

	while (cursor < len && src[cursor] != '\n') {
	if (src[*cursor] == '#') break;
	(*cursor)++;
	}

	return value;
	}

	static ant_value_t util_env_parse_unquoted_value(
	ant_t js, const char src,
	size_t len, size_t *cursor
	) {
	size_t value_start = *cursor;
	size_t value_end = *cursor;
	bool saw_space = false;

	while (cursor < len && src[cursor] != '\n' && src[*cursor] != '\r') {
	if (src[*cursor] == '#') {
	if (*cursor == value_start \|\| saw_space) goto done;
	}

	saw_space = util_env_is_inline_ws(src[*cursor]);
	(*cursor)++;
	value_end = *cursor;
	}

	done:
	while (value_start < value_end && util_env_is_inline_ws(src[value_start])) {
	value_start++;
	}
	while (value_end > value_start && util_env_is_inline_ws(src[value_end - 1])) {
	value_end--;
	}

	return js_mkstr(js, src + value_start, value_end - value_start);
	}

	static ant_value_t util_parse_env(ant_t js, ant_value_t args, int nargs) {
	ant_value_t out = js_mkobj(js);
	if (nargs < 1) return out;

	char cbuf[512];
	js_cstr_t cstr = js_to_cstr(js, args[0], cbuf, sizeof(cbuf));
	const char *src = cstr.ptr;
	size_t len = strlen(src);
	size_t i = 0;

	if (len >= 3 &&
	(unsigned char)src[0] == 0xEF &&
	(unsigned char)src[1] == 0xBB &&
	(unsigned char)src[2] == 0xBF) {
	i = 3;
	}

	while (i < len) {
	size_t key_start = 0;
	size_t key_end = 0;
	ant_value_t value = js_mkstr(js, "", 0);

	util_env_skip_inline_ws(src, len, &i);
	if (i >= len) break;
	if (src[i] == '\n') {
	i++;
	continue;
	}
	if (src[i] == '#') goto skip_line;

	util_env_consume_export(src, len, &i);
	if (!util_env_parse_key(src, len, &i, &key_start, &key_end)) goto skip_line;

	util_env_skip_inline_ws(src, len, &i);
	if (i >= len \|\| src[i] != '=') goto skip_line;
	i++;
	util_env_skip_inline_ws(src, len, &i);

	if (i < len && (src[i] == '"' \|\| src[i] == '\'' \|\| src[i] == '`')) {
	value = util_env_parse_quoted_value(js, src, len, &i);
	} else {
	value = util_env_parse_unquoted_value(js, src, len, &i);
	}

	util_env_set_entry(js, out, src + key_start, key_end - key_start, value);

	skip_line:
	util_env_skip_line(src, len, &i);
	}

	if (cstr.needs_free) free((void *)cstr.ptr);
	return out;
	}

	static const util_style_entry_t util_find_style(const char name) {
	for (size_t i = 0; i < sizeof(util_styles) / sizeof(util_styles[0]); i++) {
	if (strcmp(name, util_styles[i].name) == 0) return &util_styles[i];
	}
	return NULL;
	}

	static ant_value_t util_style_text(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 2) return js_mkstr(js, "", 0);

	char text_buf[512];
	js_cstr_t text_cstr = js_to_cstr(js, args[1], text_buf, sizeof(text_buf));

	const util_style_entry_t *picked[16];
	int picked_n = 0;

	if (vtype(args[0]) == T_STR) {
	const char *name = js_getstr(js, args[0], NULL);
	const util_style_entry_t *e = name ? util_find_style(name) : NULL;
	if (e) picked[picked_n++] = e;
	} else if (vtype(args[0]) == T_ARR) {
	ant_offset_t len = js_arr_len(js, args[0]);
	for (ant_offset_t i = 0; i < len && picked_n < (int)(sizeof(picked) / sizeof(picked[0])); i++) {
	ant_value_t item = js_arr_get(js, args[0], i);
	if (vtype(item) != T_STR) continue;
	const char *name = js_getstr(js, item, NULL);
	const util_style_entry_t *e = name ? util_find_style(name) : NULL;
	if (e) picked[picked_n++] = e;
	}
	}

	if (picked_n == 0) {
	ant_value_t out = js_mkstr(js, text_cstr.ptr, strlen(text_cstr.ptr));
	if (text_cstr.needs_free) free((void *)text_cstr.ptr);
	return out;
	}

	util_sb_t sb = {0};
	for (int i = 0; i < picked_n; i++) {
	util_sb_append_n(&sb, picked[i]->open, strlen(picked[i]->open));
	}
	util_sb_append_n(&sb, text_cstr.ptr, strlen(text_cstr.ptr));
	for (int i = picked_n - 1; i >= 0; i--) {
	util_sb_append_n(&sb, picked[i]->close, strlen(picked[i]->close));
	}

	ant_value_t out = js_mkstr(js, sb.buf ? sb.buf : "", sb.len);
	if (text_cstr.needs_free) free((void *)text_cstr.ptr);
	free(sb.buf);
	return out;
	}

	static ant_value_t util_promisify_callback(ant_t js, ant_value_t args, int nargs) {
	ant_value_t fn = js_getcurrentfunc(js);
	ant_value_t ctx = js_get_slot(fn, SLOT_DATA);
	if (!is_object_type(ctx)) return js_mkundef();

	ant_value_t settled = js_get_slot(ctx, SLOT_SETTLED);
	if (vtype(settled) == T_BOOL && settled == js_true) return js_mkundef();
	js_set_slot(ctx, SLOT_SETTLED, js_true);

	ant_value_t promise = js_get_slot(ctx, SLOT_DATA);
	if (!is_object_type(promise)) return js_mkundef();

	if (nargs > 0 && !is_null(args[0]) && !is_undefined(args[0])) {
	js_reject_promise(js, promise, args[0]);
	return js_mkundef();
	}

	if (nargs <= 1) {
	js_resolve_promise(js, promise, js_mkundef());
	return js_mkundef();
	}

	if (nargs == 2) {
	js_resolve_promise(js, promise, args[1]);
	return js_mkundef();
	}

	ant_value_t arr = js_mkarr(js);
	for (int i = 1; i < nargs; i++) js_arr_push(js, arr, args[i]);
	js_resolve_promise(js, promise, arr);
	return js_mkundef();
	}

	static ant_value_t util_promisified_call(ant_t js, ant_value_t args, int nargs) {
	ant_value_t fn = js_getcurrentfunc(js);
	ant_value_t original = js_get_slot(fn, SLOT_DATA);
	if (!is_callable(original)) return js_mkerr(js, "promisified target is not callable");

	ant_value_t promise = js_mkpromise(js);
	ant_value_t ctx = js_mkobj(js);
	js_set_slot(ctx, SLOT_DATA, promise);
	js_set_slot(ctx, SLOT_SETTLED, js_false);
	ant_value_t cb = js_heavy_mkfun(js, util_promisify_callback, ctx);

	ant_value_t call_args = (ant_value_t )malloc((size_t)(nargs + 1) * sizeof(ant_value_t));
	if (!call_args) {
	js_reject_promise(js, promise, js_mkerr(js, "Out of memory"));
	return promise;
	}
	for (int i = 0; i < nargs; i++) call_args[i] = args[i];
	call_args[nargs] = cb;

	ant_value_t this_arg = js_getthis(js);
	ant_value_t call_result = sv_vm_call(
	js->vm, js, original, this_arg, call_args, nargs + 1, NULL, false
	);
	free(call_args);

	ant_value_t settled = js_get_slot(ctx, SLOT_SETTLED);
	bool is_settled = (vtype(settled) == T_BOOL && settled == js_true);
	if (!is_settled && (is_err(call_result) \|\| js->thrown_exists)) {
	ant_value_t ex = js->thrown_exists ? js->thrown_value : call_result;
	js->thrown_exists = false;
	js->thrown_value = js_mkundef();
	js->thrown_stack = js_mkundef();
	js_set_slot(ctx, SLOT_SETTLED, js_true);
	js_reject_promise(js, promise, ex);
	}

	return promise;
	}

	static ant_value_t util_callbackify_success(ant_t js, ant_value_t args, int nargs) {
	ant_value_t state = js_get_slot(js_getcurrentfunc(js), SLOT_DATA);
	if (!is_object_type(state)) return js_mkundef();

	ant_value_t callback = js_get_slot(state, SLOT_DATA);
	if (!is_callable(callback)) return js_mkundef();

	ant_value_t cb_args[2] = {
	js_mknull(),
	nargs > 0 ? args[0] : js_mkundef()
	};

	return sv_vm_call(js->vm, js, callback, js_mkundef(), cb_args, 2, NULL, false);
	}

	static ant_value_t util_callbackify_error(ant_t js, ant_value_t args, int nargs) {
	ant_value_t state = js_get_slot(js_getcurrentfunc(js), SLOT_DATA);
	if (!is_object_type(state)) return js_mkundef();

	ant_value_t callback = js_get_slot(state, SLOT_DATA);
	if (!is_callable(callback)) return js_mkundef();

	ant_value_t err = nargs > 0 ? args[0] : js_mkerr(js, "Promise was rejected");
	ant_value_t cb_args[1] = { err };
	return sv_vm_call(js->vm, js, callback, js_mkundef(), cb_args, 1, NULL, false);
	}

	static ant_value_t util_callbackified_call(ant_t js, ant_value_t args, int nargs) {
	ant_value_t fn = js_getcurrentfunc(js);
	ant_value_t original = js_get_slot(fn, SLOT_DATA);

	if (!is_callable(original)) return js_mkerr(js, "callbackified target is not callable");
	if (nargs < 1 \|\| !is_callable(args[nargs - 1]))
	return js_mkerr_typed(js, JS_ERR_TYPE, "callbackified function requires a callback");

	ant_value_t callback = args[nargs - 1];
	int call_nargs = nargs - 1;
	ant_value_t *call_args = NULL;

	if (call_nargs > 0) {
	call_args = (ant_value_t )malloc((size_t)call_nargs sizeof(ant_value_t));
	if (!call_args) return js_mkerr(js, "Out of memory");
	for (int i = 0; i < call_nargs; i++) call_args[i] = args[i];
	}

	ant_value_t result = sv_vm_call(js->vm, js, original, js_getthis(js), call_args, call_nargs, NULL, false);
	free(call_args);

	if (is_err(result) \|\| js->thrown_exists) {
	ant_value_t ex = js->thrown_exists ? js->thrown_value : result;
	js->thrown_exists = false;
	js->thrown_value = js_mkundef();
	js->thrown_stack = js_mkundef();
	ant_value_t cb_args[1] = { ex };
	sv_vm_call(js->vm, js, callback, js_mkundef(), cb_args, 1, NULL, false);
	return js_mkundef();
	}

	if (vtype(result) != T_PROMISE) {
	ant_value_t cb_args[2] = { js_mknull(), result };
	sv_vm_call(js->vm, js, callback, js_mkundef(), cb_args, 2, NULL, false);
	return js_mkundef();
	}

	ant_value_t state = js_mkobj(js);
	js_set_slot(state, SLOT_DATA, callback);
	ant_value_t success = js_heavy_mkfun(js, util_callbackify_success, state);
	ant_value_t error = js_heavy_mkfun(js, util_callbackify_error, state);
	js_promise_then(js, result, success, error);

	return js_mkundef();
	}

	static ant_value_t util_deprecated_call(ant_t js, ant_value_t args, int nargs) {
	ant_value_t fn = js_getcurrentfunc(js);
	ant_value_t ctx = js_get_slot(fn, SLOT_DATA);
	if (!is_object_type(ctx)) return js_mkundef();

	ant_value_t warned = js_get_slot(ctx, SLOT_SETTLED);
	if (!(vtype(warned) == T_BOOL && warned == js_true)) {
	js_set_slot(ctx, SLOT_SETTLED, js_true);
	ant_value_t msg_val = js_get(js, ctx, "msg");
	const char *msg = js_getstr(js, msg_val, NULL);
	if (msg) fprintf(stderr, "DeprecationWarning: %s\n", msg);
	}

	ant_value_t original = js_get_slot(ctx, SLOT_DATA);
	ant_value_t this_arg = js_getthis(js);
	return sv_vm_call(js->vm, js, original, this_arg, args, nargs, NULL, false);
	}

	static ant_value_t util_deprecate(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_callable(args[0])) {
	return js_mkerr(js, "deprecate(fn, msg) requires a function");
	}

	ant_value_t ctx = js_mkobj(js);
	js_set_slot(ctx, SLOT_DATA, args[0]);
	js_set_slot(ctx, SLOT_SETTLED, js_false);
	if (nargs >= 2) js_set(js, ctx, "msg", args[1]);

	return js_heavy_mkfun(js, util_deprecated_call, ctx);
	}

	static ant_value_t util_promisify(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_callable(args[0])) {
	return js_mkerr(js, "promisify(fn) requires a function");
	}

	ant_value_t custom = js_get_symbol(js, args[0], "nodejs.util.promisify.custom");
	if (is_callable(custom)) return custom;

	return js_heavy_mkfun(js, util_promisified_call, args[0]);
	}

	static ant_value_t util_callbackify(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !is_callable(args[0])) {
	return js_mkerr(js, "callbackify(fn) requires a function");
	}
	return js_heavy_mkfun(js, util_callbackified_call, args[0]);
	}

	static ant_value_t util_aborted_listener(ant_t js, ant_value_t args, int nargs) {
	ant_value_t promise = js_get_slot(js_getcurrentfunc(js), SLOT_DATA);
	if (vtype(promise) == T_PROMISE) js_resolve_promise(js, promise, js_mkundef());
	return js_mkundef();
	}

	static ant_value_t util_aborted(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 1 \|\| !abort_signal_is_signal(args[0]))
	return js_mkerr_typed(js, JS_ERR_TYPE, "aborted(signal, resource) requires an AbortSignal");

	ant_value_t promise = js_mkpromise(js);
	if (abort_signal_is_aborted(args[0])) {
	js_resolve_promise(js, promise, js_mkundef());
	return promise;
	}

	abort_signal_add_listener(js, args[0], js_heavy_mkfun(js, util_aborted_listener, promise));
	return promise;
	}

	static ant_value_t util_inherits(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 2 \|\| !is_callable(args[0]) \|\| !is_callable(args[1])) {
	return js_mkerr(js, "inherits(ctor, superCtor) requires constructor functions");
	}

	ant_value_t ctor = args[0];
	ant_value_t super_ctor = args[1];
	ant_value_t ctor_proto = js_get(js, ctor, "prototype");
	ant_value_t super_proto = js_get(js, super_ctor, "prototype");

	if (!is_object_type(ctor_proto) \|\| !is_object_type(super_proto)) {
	return js_mkerr(js, "inherits(ctor, superCtor) requires prototype objects");
	}

	js_set(js, ctor, "super_", super_ctor);
	js_set_proto_init(ctor_proto, super_proto);

	return js_mkundef();
	}

	static ant_value_t util_is_deep_strict_equal(ant_t js, ant_value_t args, int nargs) {
	if (nargs < 2) return js_bool(true);
	return js_bool(js_deep_equal(js, args[0], args[1], true));
	}

	ant_value_t util_library(ant_t *js) {
	ant_value_t lib = js_mkobj(js);
	ant_value_t types = util_get_types_object(js);

	ant_value_t promisify = js_heavy_mkfun(js, util_promisify, js_mkundef());
	js_set(js, promisify, "custom", js_mksym_for(js, "nodejs.util.promisify.custom"));

	js_set(js, lib, "format", js_mkfun(util_format));
	js_set(js, lib, "formatWithOptions", js_mkfun(util_format_with_options));
	js_set(js, lib, "debuglog", js_mkfun(util_debuglog));
	js_set(js, lib, "inspect", js_mkfun(util_inspect));
	js_set(js, lib, "deprecate", js_mkfun(util_deprecate));
	js_set(js, lib, "inherits", js_mkfun(util_inherits));
	js_set(js, lib, "isDeepStrictEqual", js_mkfun(util_is_deep_strict_equal));
	js_set(js, lib, "parseArgs", js_mkfun(util_parse_args));
	js_set(js, lib, "parseEnv", js_mkfun(util_parse_env));
	js_set(js, lib, "promisify", promisify);
	js_set(js, lib, "callbackify", js_mkfun(util_callbackify));
	js_set(js, lib, "aborted", js_mkfun(util_aborted));
	js_set(js, lib, "stripVTControlCharacters", js_mkfun(util_strip_vt_control_characters));
	js_set(js, lib, "styleText", js_mkfun(util_style_text));
	js_set(js, lib, "types", types);

	js_set_sym(js, lib, get_toStringTag_sym(), js_mkstr(js, "util", 4));
	return lib;
	}

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