Function isPoly

packages/shared/src/utils/polyvinyl.ts:61–82

(poly: unknown)

}

export function isPoly(poly: unknown): poly is ChallengeFile {
  function hasProperties(poly: unknown): poly is Record<string, unknown> {
    return (
      !!poly &&
      typeof poly === 'object' &&
      'contents' in poly &&
      'name' in poly &&
      'ext' in poly &&
      'fileKey' in poly &&
      'history' in poly
    );
  }

  const hasCorrectTypes = (poly: Record<string, unknown>): boolean =>
    typeof poly.contents === 'string' &&
    typeof poly.name === 'string' &&
    exts.includes(poly.ext as Ext) &&
    typeof poly.fileKey === 'string' &&
    Array.isArray(poly.history);

  return hasProperties(poly) && hasCorrectTypes(poly);
}

function checkPoly(poly: ChallengeFile) {
  if (!isPoly(poly)) throw Error('Not a PolyVinyl: ' + JSON.stringify(poly));