Function equals

packages/expect/src/jest-utils.ts:31–39

(
  a: unknown,
  b: unknown,
  customTesters?: Array<Tester>,
  strictCheck?: boolean,
)

// Extracted out of jasmine 2.5.2
export function equals(
  a: unknown,
  b: unknown,
  customTesters?: Array<Tester>,
  strictCheck?: boolean,
): boolean {
  customTesters = customTesters || []
  return eq(a, b, [], [], customTesters, strictCheck ? hasKey : hasDefinedKey)
}

const functionToString = Function.prototype.toString