Function printDiffCall

packages/expect/src/spyMatchers.ts:221–260

(
  expected: Array<unknown>,
  received: Array<unknown>,
  expand: boolean,
)

const indentation = 'Received'.replaceAll(/\w/g, ' ');

const printDiffCall = (
  expected: Array<unknown>,
  received: Array<unknown>,
  expand: boolean,
) =>
  received
    .map((arg, i) => {
      if (i < expected.length) {
        if (isEqualValue(expected[i], arg)) {
          return `${indentation}  ${printCommon(arg)},`;
        }

        if (isLineDiffableArg(expected[i], arg)) {
          const difference = diff(expected[i], arg, {expand});

          if (
            typeof difference === 'string' &&
            difference.includes('- Expected') &&
            difference.includes('+ Received')
          ) {
            // Display diff with indentation.
            // Omit annotation in case multiple args have diff.
            return `${difference
              .split('\n')
              .slice(3)
              .map(line => indentation + line)
              .join('\n')},`;
          }
        }
      }

      // Display + only if received arg has no corresponding expected arg.
      return `${
        indentation +
        (i < expected.length
          ? `  ${printReceived(arg)}`
          : RECEIVED_COLOR(`+ ${stringify(arg)}`))
      },`;
    })
    .join('\n');

const isLineDiffableCall = (
  expected: Array<unknown>,