jtc-utils/cjs/src/isUnicodeBMP.cts

Utilities for Japanese Traditional Companies

export function isUnicodeBMP(value: string | null | undefined) {
  if (value == null) {
    return false;
  }

  if (/[\uD800-\uDFFF]/.test(value)) {
    return false;
  }

  return true;
}