Function readVariableDefault

packages/sdk/src/engine/variableModel.ts:40–45

(document: Document, id: string)

 * the attribute is absent, the JSON is invalid, or no entry matches the id.
 */
export function readVariableDefault(document: Document, id: string): unknown {
  const decls = readDecls(document);
  if (!decls) return undefined;
  const idx = indexOfId(decls.arr, id);
  return idx < 0 ? undefined : decls.arr[idx]?.default;
}

/**
 * Upsert a variable's `default`. No-ops (returns false) when the attribute is