buildValueCandidates function presentation ✓ 100.0%

function buildValueCandidates(value: string, maxLength: number): string[] {
  const candidates: string[] = [];

  const pushCandidate = (candidate: string): void => {
    if (!candidate && candidate !== "") return;
    if (!candidates.includes(candidate)) {
      candidates.push(candidate);
    }
  };

  pushCandidate(value);

  const trimmed = value.trim();
  if (trimmed !== value) pushCandidate(trimmed);

  const collapsedWhitespace = value.replace(/\s+/g, " ").trim();
  if (collapsedWhitespace && collapsedWhitespace !== value) {
    pushCandidate(collapsedWhitespace);
  }

  const digitsOnly = value.replace(/\D+/g, "");
  if (digitsOnly && digitsOnly !== value) {
    pushCandidate(digitsOnly);
  }

  if (maxLength > 0) {
    for (const candidate of [...candidates]) {
      if (candidate.length > maxLength) {
        pushCandidate(candidate.slice(0, maxLength));
      }
    }
  }

  return candidates;
}