Function getStackedDiff

lib/internal/assert/assertion_error.js:125–153

(actual, expected)

}

function getStackedDiff(actual, expected) {
  const isStringComparison = typeof actual === 'string' && typeof expected === 'string';

  let message = `\n${colors.green}+${colors.white} ${actual}\n${colors.red}- ${colors.white}${expected}`;
  const stringsLen = actual.length + expected.length;
  const maxTerminalLength = process.stderr.isTTY ? process.stderr.columns : 80;
  const showIndicator = isStringComparison && (stringsLen <= maxTerminalLength);

  if (showIndicator) {
    let indicatorIdx = -1;

    for (let i = 0; i < actual.length; i++) {
      if (actual[i] !== expected[i]) {
        // Skip the indicator for the first 2 characters because the diff is immediately apparent
        // It is 3 instead of 2 to account for the quotes
        if (i >= 3) {
          indicatorIdx = i;
        }
        break;
      }
    }

    if (indicatorIdx !== -1) {
      message += `\n${StringPrototypeRepeat(' ', indicatorIdx + 2)}^`;
    }
  }

  return { message };
}

function getSimpleDiff(originalActual, actual, originalExpected, expected) {
  let stringsLen = actual.length + expected.length;