Example:

import src/nodejs/jspunycode
requirePunycode()
const str = "hello".cstring
doAssert decode(str) == "㗁㖼㖶".cstring
doAssert encode(str) == "hello-".cstring
doAssert toASCII(str) == "hello".cstring
doAssert toUnicode(str) == "hello".cstring
doAssert ucs2Decode(str) == @[104.cint, 101, 108, 108, 111]
doAssert ucs2Encode(@[104.cint, 101, 108, 108, 111]) == "hello".cstring

Procs

func decode(stringy: cstring): cstring {.importjs: "punycode.$1(#)", ...raises: [], tags: [].}: https://nodejs.org/api/punycode.html#punycode_punycode_decode_string
func encode(stringy: cstring): cstring {.importjs: "punycode.$1(#)", ...raises: [], tags: [].}: https://nodejs.org/api/punycode.html#punycode_punycode_encode_string
func importPunycode() {.importjs: "import * as punycode from \'punycode\'@", ...raises: [], tags: [].}: Alias for import * as module_name from 'module_name';. Must be called once before using the module
func requirePunycode() {.importjs: "const punycode = require(\'punycode\')@", ...raises: [], tags: [].}: Alias for const module_name = require('module_name');. Must be called once before using the module
func toASCII(stringy: cstring): cstring {.importjs: "punycode.$1(#)", ...raises: [], tags: [].}: https://nodejs.org/api/punycode.html#punycode_punycode_toascii_domain
func toUnicode(stringy: cstring): cstring {.importjs: "punycode.$1(#)", ...raises: [], tags: [].}: https://nodejs.org/api/punycode.html#punycode_punycode_tounicode_domain
func ucs2Decode(stringy: cstring): seq[cint] {. importjs: "punycode.ucs2.decode(#)", ...raises: [], tags: [].}: https://nodejs.org/api/punycode.html#punycode_punycode_ucs2_decode_string
func ucs2Encode(codePoints: openArray[cint]): cstring {. importjs: "punycode.ucs2.encode(#)", ...raises: [], tags: [].}: https://nodejs.org/api/punycode.html#punycode_punycode_ucs2_encode_codepoints