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import { validateString } from "./validators.js";import { promisify } from "../_util/_util_promisify.ts";export { promisify };
export function normalizeEncoding(enc) {  if (enc == null || enc === "utf8" || enc === "utf-8") return "utf8";  return slowCases(enc);}
export function slowCases(enc) {  switch (enc.length) {    case 4:      if (enc === "UTF8") return "utf8";      if (enc === "ucs2" || enc === "UCS2") return "utf16le";      enc = `${enc}`.toLowerCase();      if (enc === "utf8") return "utf8";      if (enc === "ucs2") return "utf16le";      break;    case 3:      if (        enc === "hex" || enc === "HEX" ||        `${enc}`.toLowerCase() === "hex"      ) {        return "hex";      }      break;    case 5:      if (enc === "ascii") return "ascii";      if (enc === "ucs-2") return "utf16le";      if (enc === "UTF-8") return "utf8";      if (enc === "ASCII") return "ascii";      if (enc === "UCS-2") return "utf16le";      enc = `${enc}`.toLowerCase();      if (enc === "utf-8") return "utf8";      if (enc === "ascii") return "ascii";      if (enc === "ucs-2") return "utf16le";      break;    case 6:      if (enc === "base64") return "base64";      if (enc === "latin1" || enc === "binary") return "latin1";      if (enc === "BASE64") return "base64";      if (enc === "LATIN1" || enc === "BINARY") return "latin1";      enc = `${enc}`.toLowerCase();      if (enc === "base64") return "base64";      if (enc === "latin1" || enc === "binary") return "latin1";      break;    case 7:      if (        enc === "utf16le" || enc === "UTF16LE" ||        `${enc}`.toLowerCase() === "utf16le"      ) {        return "utf16le";      }      break;    case 8:      if (        enc === "utf-16le" || enc === "UTF-16LE" ||        `${enc}`.toLowerCase() === "utf-16le"      ) {        return "utf16le";      }      break;    case 9:      if (        enc === "base64url" || enc === "BASE64URL" ||        `${enc}`.toLowerCase() === "base64url"      ) {        return "base64url";      }      break;    default:      if (enc === "") return "utf8";  }}
export function once(callback) {  let called = false;  return function (...args) {    if (called) return;    called = true;    Reflect.apply(callback, this, args);  };}
export function createDeferredPromise() {  let resolve;  let reject;  const promise = new Promise((res, rej) => {    resolve = res;    reject = rej;  });
  return { promise, resolve, reject };}
// Keep a list of deprecation codes that have been warned on so we only warn on// each one once.const codesWarned = new Set();
// Mark that a method should not be used.// Returns a modified function which warns once by default.// If --no-deprecation is set, then it is a no-op.export function deprecate(fn, msg, code) {  // TODO(kt3k): Uncomment this  // if (process.noDeprecation === true) {  //  return fn;  // }
  if (code !== undefined) {    validateString(code, "code");  }
  let warned = false;  function deprecated(...args) {    if (!warned) {      warned = true;      if (code !== undefined) {        if (!codesWarned.has(code)) {          process.emitWarning(msg, "DeprecationWarning", code, deprecated);          codesWarned.add(code);        }      } else {        process.emitWarning(msg, "DeprecationWarning", deprecated);      }    }    if (new.target) {      return Reflect.construct(fn, args, new.target);    }    return Reflect.apply(fn, this, args);  }
  // The wrapper will keep the same prototype as fn to maintain prototype chain  Object.setPrototypeOf(deprecated, fn);  if (fn.prototype) {    // Setting this (rather than using Object.setPrototype, as above) ensures    // that calling the unwrapped constructor gives an instanceof the wrapped    // constructor.    deprecated.prototype = fn.prototype;  }
  return deprecated;}
export default {  createDeferredPromise,  normalizeEncoding,  once,  deprecate,};