Function joinDiffs

packages/jest-snapshot/src/printSnapshot.ts:148–164

(
  diffs: Array<Diff>,
  op: number,
  hasCommon: boolean,
)

// * include change substrings which have argument op
//   with change color only if there is a common substring
const joinDiffs = (
  diffs: Array<Diff>,
  op: number,
  hasCommon: boolean,
): string =>
  diffs.reduce(
    (reduced: string, diff: Diff): string =>
      reduced +
      (diff[0] === DIFF_EQUAL
        ? diff[1]
        : diff[0] === op
          ? hasCommon
            ? INVERTED_COLOR(diff[1])
            : diff[1]
          : ''),
    '',
  );

const isLineDiffable = (received: unknown): boolean => {
  const receivedType = getType(received);