/**
 * Make an assertion that `actual` and `expected` are almost equal numbers
 * through a given tolerance. It can be used to take into account IEEE-754
 * double-precision floating-point representation limitations. If the values
 * are not almost equal then throw.
 *
 * The default tolerance is one hundred thousandth of a percent of the
 * expected value.
 *
 * @example Usage
 * ```ts ignore
 * import { assertAlmostEquals } from "@std/assert";
 *
 * assertAlmostEquals(0.01, 0.02); // Throws
 * assertAlmostEquals(1e-8, 1e-9); // Throws
 * assertAlmostEquals(1.000000001e-8, 1.000000002e-8); // Doesn't throw
 * assertAlmostEquals(0.01, 0.02, 0.1); // Doesn't throw
 * assertAlmostEquals(0.1 + 0.2, 0.3, 1e-16); // Doesn't throw
 * assertAlmostEquals(0.1 + 0.2, 0.3, 1e-17); // Throws
 * ```
 *
 * @param actual The actual value to compare.
 * @param expected The expected value to compare.
 * @param tolerance The tolerance to consider the values almost equal. The
 * default is one hundred thousandth of a percent of the expected value.
 * @param msg The optional message to include in the error.
 * @throws {AssertionError} If the values are not almost equal.
 */
export declare function assertAlmostEquals(actual: number, expected: number, tolerance?: number, msg?: string): void;
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