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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.import { format } from "./_format.ts";import { AssertionError } from "./assertion_error.ts";import { buildMessage, diff, diffstr } from "./_diff.ts";import { CAN_NOT_DISPLAY } from "./_constants.ts";import { red } from "../fmt/colors.ts";
/** * Make an assertion that `actual` and `expected` are strictly equal. If * not then throw. * * @example * ```ts * import { assertStrictEquals } from "https://deno.land/std@$STD_VERSION/assert/assert_strict_equals.ts"; * * Deno.test("isStrictlyEqual", function (): void { *   const a = {}; *   const b = a; *   assertStrictEquals(a, b); * }); * * // This test fails * Deno.test("isNotStrictlyEqual", function (): void { *   const a = {}; *   const b = {}; *   assertStrictEquals(a, b); * }); * ``` */export function assertStrictEquals<T>(  actual: unknown,  expected: T,  msg?: string,): asserts actual is T {  if (Object.is(actual, expected)) {    return;  }
  const msgSuffix = msg ? `: ${msg}` : ".";  let message: string;
  const actualString = format(actual);  const expectedString = format(expected);
  if (actualString === expectedString) {    const withOffset = actualString      .split("\n")      .map((l) => `    ${l}`)      .join("\n");    message =      `Values have the same structure but are not reference-equal${msgSuffix}\n\n${        red(withOffset)      }\n`;  } else {    try {      const stringDiff = (typeof actual === "string") &&        (typeof expected === "string");      const diffResult = stringDiff        ? diffstr(actual as string, expected as string)        : diff(actualString.split("\n"), expectedString.split("\n"));      const diffMsg = buildMessage(diffResult, { stringDiff }).join("\n");      message = `Values are not strictly equal${msgSuffix}\n${diffMsg}`;    } catch {      message = `\n${red(CAN_NOT_DISPLAY)} + \n\n`;    }  }
  throw new AssertionError(message);}