message: Enforce type for .exec return
diff: @@ -29,7 +29,7 @@ export class BibLogParser {
  this.buildLog = []
  - let result = undefined
  + let result: RegExpExecArray | null
  while ((result = singleLineWarning.exec(log))) {
  const location = this.findKeyLocation(result[2])
  if (location) {
  