Function hasUnmatchedDoubleQuoteMarks

packages/jest-snapshot/src/dedentLines.ts:19–32

(string: string)

// "key": "value has multiple lines\n…
// "key has multiple lines\n…
const hasUnmatchedDoubleQuoteMarks = (string: string): boolean => {
  let n = 0;

  let i = string.indexOf('"', 0);
  while (i !== -1) {
    if (i === 0 || string[i - 1] !== '\\') {
      n += 1;
    }

    i = string.indexOf('"', i + 1);
  }

  return n % 2 !== 0;
};

const isFirstLineOfTag = (line: string) => /^( {2})*</.test(line);