Function toThrow

packages/expect/src/toThrowMatchers.ts:378–402

(
  matcherName: string,
  options: MatcherHintOptions,
  thrown: Thrown | null,
)

};

const toThrow = (
  matcherName: string,
  options: MatcherHintOptions,
  thrown: Thrown | null,
): SyncExpectationResult => {
  const pass = thrown !== null;

  const message = pass
    ? () =>
        // eslint-disable-next-line prefer-template
        matcherHint(matcherName, undefined, '', options) +
        '\n\n' +
        (thrown !== null && thrown.hasMessage
          ? formatReceived('Error name:    ', thrown, 'name') +
            formatReceived('Error message: ', thrown, 'message') +
            formatStack(thrown)
          : formatReceived('Thrown value: ', thrown, 'value'))
    : () =>
        // eslint-disable-next-line prefer-template
        matcherHint(matcherName, undefined, '', options) +
        '\n\n' +
        DID_NOT_THROW;

  return {message, pass};
};

const formatExpected = (label: string, expected: unknown) =>
  `${label + printExpected(expected)}\n`;