1 files changed, 210 insertions, 0 deletions
diff --git a/ext/node/polyfills/_utils.ts b/ext/node/polyfills/_utils.ts
new file mode 100644
index 000000000..85398ead9
--- /dev/null
+++ b/ext/node/polyfills/_utils.ts
@@ -0,0 +1,210 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import {
+  TextDecoder,
+  TextEncoder,
+} from "internal:deno_web/08_text_encoding.js";
+import { errorMap } from "internal:deno_node/polyfills/internal_binding/uv.ts";
+import { codes } from "internal:deno_node/polyfills/internal/error_codes.ts";
+
+export type BinaryEncodings = "binary";
+
+export type TextEncodings =
+  | "ascii"
+  | "utf8"
+  | "utf-8"
+  | "utf16le"
+  | "ucs2"
+  | "ucs-2"
+  | "base64"
+  | "latin1"
+  | "hex";
+
+export type Encodings = BinaryEncodings | TextEncodings;
+
+export function notImplemented(msg: string): never {
+  const message = msg ? `Not implemented: ${msg}` : "Not implemented";
+  throw new Error(message);
+}
+
+export function warnNotImplemented(msg?: string) {
+  const message = msg
+    ? `Warning: Not implemented: ${msg}`
+    : "Warning: Not implemented";
+  console.warn(message);
+}
+
+export type _TextDecoder = typeof TextDecoder.prototype;
+export const _TextDecoder = TextDecoder;
+
+export type _TextEncoder = typeof TextEncoder.prototype;
+export const _TextEncoder = TextEncoder;
+
+// API helpers
+
+export type MaybeNull<T> = T | null;
+export type MaybeDefined<T> = T | undefined;
+export type MaybeEmpty<T> = T | null | undefined;
+
+export function intoCallbackAPI<T>(
+  // deno-lint-ignore no-explicit-any
+  func: (...args: any[]) => Promise<T>,
+  cb: MaybeEmpty<(err: MaybeNull<Error>, value?: MaybeEmpty<T>) => void>,
+  // deno-lint-ignore no-explicit-any
+  ...args: any[]
+) {
+  func(...args).then(
+    (value) => cb && cb(null, value),
+    (err) => cb && cb(err),
+  );
+}
+
+export function intoCallbackAPIWithIntercept<T1, T2>(
+  // deno-lint-ignore no-explicit-any
+  func: (...args: any[]) => Promise<T1>,
+  interceptor: (v: T1) => T2,
+  cb: MaybeEmpty<(err: MaybeNull<Error>, value?: MaybeEmpty<T2>) => void>,
+  // deno-lint-ignore no-explicit-any
+  ...args: any[]
+) {
+  func(...args).then(
+    (value) => cb && cb(null, interceptor(value)),
+    (err) => cb && cb(err),
+  );
+}
+
+export function spliceOne(list: string[], index: number) {
+  for (; index + 1 < list.length; index++) list[index] = list[index + 1];
+  list.pop();
+}
+
+// Taken from: https://github.com/nodejs/node/blob/ba684805b6c0eded76e5cd89ee00328ac7a59365/lib/internal/util.js#L125
+// Return undefined if there is no match.
+// Move the "slow cases" to a separate function to make sure this function gets
+// inlined properly. That prioritizes the common case.
+export function normalizeEncoding(
+  enc: string | null,
+): TextEncodings | undefined {
+  if (enc == null || enc === "utf8" || enc === "utf-8") return "utf8";
+  return slowCases(enc);
+}
+
+// https://github.com/nodejs/node/blob/ba684805b6c0eded76e5cd89ee00328ac7a59365/lib/internal/util.js#L130
+function slowCases(enc: string): TextEncodings | undefined {
+  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" ||
+        `${enc}`.toLowerCase() === "utf-16le"
+      ) {
+        return "utf16le";
+      }
+      break;
+    default:
+      if (enc === "") return "utf8";
+  }
+}
+
+export function validateIntegerRange(
+  value: number,
+  name: string,
+  min = -2147483648,
+  max = 2147483647,
+) {
+  // The defaults for min and max correspond to the limits of 32-bit integers.
+  if (!Number.isInteger(value)) {
+    throw new Error(`${name} must be 'an integer' but was ${value}`);
+  }
+
+  if (value < min || value > max) {
+    throw new Error(
+      `${name} must be >= ${min} && <= ${max}. Value was ${value}`,
+    );
+  }
+}
+
+type OptionalSpread<T> = T extends undefined ? []
+  : [T];
+
+export function once<T = undefined>(
+  callback: (...args: OptionalSpread<T>) => void,
+) {
+  let called = false;
+  return function (this: unknown, ...args: OptionalSpread<T>) {
+    if (called) return;
+    called = true;
+    callback.apply(this, args);
+  };
+}
+
+export function makeMethodsEnumerable(klass: { new (): unknown }) {
+  const proto = klass.prototype;
+  for (const key of Object.getOwnPropertyNames(proto)) {
+    const value = proto[key];
+    if (typeof value === "function") {
+      const desc = Reflect.getOwnPropertyDescriptor(proto, key);
+      if (desc) {
+        desc.enumerable = true;
+        Object.defineProperty(proto, key, desc);
+      }
+    }
+  }
+}
+
+const NumberIsSafeInteger = Number.isSafeInteger;
+
+/**
+ * Returns a system error name from an error code number.
+ * @param code error code number
+ */
+export function getSystemErrorName(code: number): string | undefined {
+  if (typeof code !== "number") {
+    throw new codes.ERR_INVALID_ARG_TYPE("err", "number", code);
+  }
+  if (code >= 0 || !NumberIsSafeInteger(code)) {
+    throw new codes.ERR_OUT_OF_RANGE("err", "a negative integer", code);
+  }
+  return errorMap.get(code)?.[0];
+}