Function getCommonAndChangedSubstrings

packages/jest-matcher-utils/src/index.ts:257–273

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

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

const isLineDiffable = (expected: unknown, received: unknown): boolean => {
  const expectedType = getType(expected);