/**
 * Make an assertion, an error will be thrown if `expr` does not have a truthy value.
 *
 * @example Usage
 * ```ts ignore
 * import { assert } from "@std/assert";
 *
 * assert("hello".includes("ello")); // Doesn't throw
 * assert("hello".includes("world")); // Throws
 * ```
 *
 * @param expr The expression to test.
 * @param msg The optional message to display if the assertion fails.
 * @throws {AssertionError} If `expr` is falsy.
 */
export declare function assert(expr: unknown, msg?: string): asserts expr;
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