1 files changed, 293 insertions, 0 deletions
diff --git a/ext/node/polyfills/_util/std_asserts.ts b/ext/node/polyfills/_util/std_asserts.ts
new file mode 100644
index 000000000..8c4c80078
--- /dev/null
+++ b/ext/node/polyfills/_util/std_asserts.ts
@@ -0,0 +1,293 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// vendored from std/testing/asserts.ts
+
+import { red } from "internal:deno_node/polyfills/_util/std_fmt_colors.ts";
+import {
+  buildMessage,
+  diff,
+  diffstr,
+} from "internal:deno_node/polyfills/_util/std_testing_diff.ts";
+
+/** Converts the input into a string. Objects, Sets and Maps are sorted so as to
+ * make tests less flaky */
+export function format(v: unknown): string {
+  // deno-lint-ignore no-explicit-any
+  const { Deno } = globalThis as any;
+  return typeof Deno?.inspect === "function"
+    ? Deno.inspect(v, {
+      depth: Infinity,
+      sorted: true,
+      trailingComma: true,
+      compact: false,
+      iterableLimit: Infinity,
+      // getters should be true in assertEquals.
+      getters: true,
+    })
+    : `"${String(v).replace(/(?=["\\])/g, "\\")}"`;
+}
+
+const CAN_NOT_DISPLAY = "[Cannot display]";
+
+export class AssertionError extends Error {
+  override name = "AssertionError";
+  constructor(message: string) {
+    super(message);
+  }
+}
+
+function isKeyedCollection(x: unknown): x is Set<unknown> {
+  return [Symbol.iterator, "size"].every((k) => k in (x as Set<unknown>));
+}
+
+/** Deep equality comparison used in assertions */
+export function equal(c: unknown, d: unknown): boolean {
+  const seen = new Map();
+  return (function compare(a: unknown, b: unknown): boolean {
+    // Have to render RegExp & Date for string comparison
+    // unless it's mistreated as object
+    if (
+      a &&
+      b &&
+      ((a instanceof RegExp && b instanceof RegExp) ||
+        (a instanceof URL && b instanceof URL))
+    ) {
+      return String(a) === String(b);
+    }
+    if (a instanceof Date && b instanceof Date) {
+      const aTime = a.getTime();
+      const bTime = b.getTime();
+      // Check for NaN equality manually since NaN is not
+      // equal to itself.
+      if (Number.isNaN(aTime) && Number.isNaN(bTime)) {
+        return true;
+      }
+      return aTime === bTime;
+    }
+    if (typeof a === "number" && typeof b === "number") {
+      return Number.isNaN(a) && Number.isNaN(b) || a === b;
+    }
+    if (Object.is(a, b)) {
+      return true;
+    }
+    if (a && typeof a === "object" && b && typeof b === "object") {
+      if (a && b && !constructorsEqual(a, b)) {
+        return false;
+      }
+      if (a instanceof WeakMap || b instanceof WeakMap) {
+        if (!(a instanceof WeakMap && b instanceof WeakMap)) return false;
+        throw new TypeError("cannot compare WeakMap instances");
+      }
+      if (a instanceof WeakSet || b instanceof WeakSet) {
+        if (!(a instanceof WeakSet && b instanceof WeakSet)) return false;
+        throw new TypeError("cannot compare WeakSet instances");
+      }
+      if (seen.get(a) === b) {
+        return true;
+      }
+      if (Object.keys(a || {}).length !== Object.keys(b || {}).length) {
+        return false;
+      }
+      seen.set(a, b);
+      if (isKeyedCollection(a) && isKeyedCollection(b)) {
+        if (a.size !== b.size) {
+          return false;
+        }
+
+        let unmatchedEntries = a.size;
+
+        for (const [aKey, aValue] of a.entries()) {
+          for (const [bKey, bValue] of b.entries()) {
+            /* Given that Map keys can be references, we need
+             * to ensure that they are also deeply equal */
+            if (
+              (aKey === aValue && bKey === bValue && compare(aKey, bKey)) ||
+              (compare(aKey, bKey) && compare(aValue, bValue))
+            ) {
+              unmatchedEntries--;
+              break;
+            }
+          }
+        }
+
+        return unmatchedEntries === 0;
+      }
+      const merged = { ...a, ...b };
+      for (
+        const key of [
+          ...Object.getOwnPropertyNames(merged),
+          ...Object.getOwnPropertySymbols(merged),
+        ]
+      ) {
+        type Key = keyof typeof merged;
+        if (!compare(a && a[key as Key], b && b[key as Key])) {
+          return false;
+        }
+        if (((key in a) && (!(key in b))) || ((key in b) && (!(key in a)))) {
+          return false;
+        }
+      }
+      if (a instanceof WeakRef || b instanceof WeakRef) {
+        if (!(a instanceof WeakRef && b instanceof WeakRef)) return false;
+        return compare(a.deref(), b.deref());
+      }
+      return true;
+    }
+    return false;
+  })(c, d);
+}
+
+// deno-lint-ignore ban-types
+function constructorsEqual(a: object, b: object) {
+  return a.constructor === b.constructor ||
+    a.constructor === Object && !b.constructor ||
+    !a.constructor && b.constructor === Object;
+}
+
+/** Make an assertion, error will be thrown if `expr` does not have truthy value. */
+export function assert(expr: unknown, msg = ""): asserts expr {
+  if (!expr) {
+    throw new AssertionError(msg);
+  }
+}
+
+/** Make an assertion that `actual` and `expected` are equal, deeply. If not
+ * deeply equal, then throw. */
+export function assertEquals<T>(actual: T, expected: T, msg?: string) {
+  if (equal(actual, expected)) {
+    return;
+  }
+  let message = "";
+  const actualString = format(actual);
+  const expectedString = format(expected);
+  try {
+    const stringDiff = (typeof actual === "string") &&
+      (typeof expected === "string");
+    const diffResult = stringDiff
+      ? diffstr(actual as string, expected as string)
+      : diff(actualString.split("\n"), expectedString.split("\n"));
+    const diffMsg = buildMessage(diffResult, { stringDiff }).join("\n");
+    message = `Values are not equal:\n${diffMsg}`;
+  } catch {
+    message = `\n${red(red(CAN_NOT_DISPLAY))} + \n\n`;
+  }
+  if (msg) {
+    message = msg;
+  }
+  throw new AssertionError(message);
+}
+
+/** Make an assertion that `actual` and `expected` are not equal, deeply.
+ * If not then throw. */
+export function assertNotEquals<T>(actual: T, expected: T, msg?: string) {
+  if (!equal(actual, expected)) {
+    return;
+  }
+  let actualString: string;
+  let expectedString: string;
+  try {
+    actualString = String(actual);
+  } catch {
+    actualString = "[Cannot display]";
+  }
+  try {
+    expectedString = String(expected);
+  } catch {
+    expectedString = "[Cannot display]";
+  }
+  if (!msg) {
+    msg = `actual: ${actualString} expected not to be: ${expectedString}`;
+  }
+  throw new AssertionError(msg);
+}
+
+/** Make an assertion that `actual` and `expected` are strictly equal. If
+ * not then throw. */
+export function assertStrictEquals<T>(
+  actual: unknown,
+  expected: T,
+  msg?: string,
+): asserts actual is T {
+  if (Object.is(actual, expected)) {
+    return;
+  }
+
+  let message: string;
+
+  if (msg) {
+    message = msg;
+  } else {
+    const actualString = format(actual);
+    const expectedString = format(expected);
+
+    if (actualString === expectedString) {
+      const withOffset = actualString
+        .split("\n")
+        .map((l) => `    ${l}`)
+        .join("\n");
+      message =
+        `Values have the same structure but are not reference-equal:\n\n${
+          red(withOffset)
+        }\n`;
+    } else {
+      try {
+        const stringDiff = (typeof actual === "string") &&
+          (typeof expected === "string");
+        const diffResult = stringDiff
+          ? diffstr(actual as string, expected as string)
+          : diff(actualString.split("\n"), expectedString.split("\n"));
+        const diffMsg = buildMessage(diffResult, { stringDiff }).join("\n");
+        message = `Values are not strictly equal:\n${diffMsg}`;
+      } catch {
+        message = `\n${CAN_NOT_DISPLAY} + \n\n`;
+      }
+    }
+  }
+
+  throw new AssertionError(message);
+}
+
+/** Make an assertion that `actual` and `expected` are not strictly equal.
+ * If the values are strictly equal then throw. */
+export function assertNotStrictEquals<T>(
+  actual: T,
+  expected: T,
+  msg?: string,
+) {
+  if (!Object.is(actual, expected)) {
+    return;
+  }
+
+  throw new AssertionError(
+    msg ?? `Expected "actual" to be strictly unequal to: ${format(actual)}\n`,
+  );
+}
+
+/** Make an assertion that `actual` match RegExp `expected`. If not
+ * then throw. */
+export function assertMatch(
+  actual: string,
+  expected: RegExp,
+  msg?: string,
+) {
+  if (!expected.test(actual)) {
+    if (!msg) {
+      msg = `actual: "${actual}" expected to match: "${expected}"`;
+    }
+    throw new AssertionError(msg);
+  }
+}
+
+/** Make an assertion that `actual` not match RegExp `expected`. If match
+ * then throw. */
+export function assertNotMatch(
+  actual: string,
+  expected: RegExp,
+  msg?: string,
+) {
+  if (expected.test(actual)) {
+    if (!msg) {
+      msg = `actual: "${actual}" expected to not match: "${expected}"`;
+    }
+    throw new AssertionError(msg);
+  }
+}