import { AssertionError } from "./assertion_error.ts";import { stripColor } from "../fmt/colors.ts";
export function assertIsError<E extends Error = Error>( error: unknown, ErrorClass?: new (...args: any[]) => E, msgIncludes?: string, msg?: string,): asserts error is E { const msgSuffix = msg ? `: ${msg}` : "."; if (error instanceof Error === false) { throw new AssertionError( `Expected "error" to be an Error object${msgSuffix}}`, ); } if (ErrorClass && !(error instanceof ErrorClass)) { msg = `Expected error to be instance of "${ErrorClass.name}", but was "${ typeof error === "object" ? error?.constructor?.name : "[not an object]" }"${msgSuffix}`; throw new AssertionError(msg); } if ( msgIncludes && (!(error instanceof Error) || !stripColor(error.message).includes(stripColor(msgIncludes))) ) { msg = `Expected error message to include ${ JSON.stringify(msgIncludes) }, but got ${ error instanceof Error ? JSON.stringify(error.message) : '"[not an Error]"' }${msgSuffix}`; throw new AssertionError(msg); }}