Function matcherErrorMessage

packages/jest-matcher-utils/src/index.ts:512–519

(
  hint: string, // assertion returned from call to matcherHint
  generic: string, // condition which correct value must fulfill
  specific?: string, // incorrect value returned from call to printWithType
)

};

export const matcherErrorMessage = (
  hint: string, // assertion returned from call to matcherHint
  generic: string, // condition which correct value must fulfill
  specific?: string, // incorrect value returned from call to printWithType
): string =>
  `${hint}\n\n${chalk.bold('Matcher error')}: ${generic}${
    typeof specific === 'string' ? `\n\n${specific}` : ''
  }`;

// Display assertion for the report when a test fails.
// New format: rejects/resolves, not, and matcher name have black color