docs: function lineNumbersOf(filePath, value, iteratee, fromLine) {
    // Get `filePath` lines.
    var fileLines = fs.readFileSync(filePath, 'utf8').split('\n')
  
    // Find occurrences of `value` in `fileLines`.
    for (var l = fromLine || 0, fileLinesLen = fileLines.length; l < fileLinesLen; ++l) {
      if (fileLines[l].indexOf(value) !== -1) {
        // Add 1 to line index because line numbers begin at 1.
        if (iteratee(l + 1)) {
          // Exit if `iteratee` returns truthy.
          return true
        }
      }
    }
  
    return false
  }