Cannot return SQL fragment directly from async function

I have async helper function which should create SQL fragment. But when I return it directly, it is treated as executable query and this of course fail badly.

Is there possibility to create only SQL fragment, which have not PromiseLike interface?

Example:

This will not work:

  async getSqlFilter(/* ... */): Promise<PendingQuery> {
     return sql`true`;
  }

Workaround – working, but ugly:

  async getSqlFilter(/* ... */): Promise<{ filter: PendingQuery }> {
     return { filter: sql`true` };
  }

Request; proposed API:

  async getSqlFilter(/* ... */): Promise<QueryFragment> {
     return sql.fragment`true`; // this cannot be executed
  }

Use case:

  async getSqlFilter(...values: string[]): Promise<QueryFragment> {
     if (values.length === 0) {
       return sql.fragment`true`; // or false, it depends :-)
     } else if (values.length === 1) {
       return sql.fragment`attribute = ${values[0]}`;
     } else {
       return sql.fragment`attribute = ANY(${values})`;
     }
  }

Is there interrest in this feature?

IMHO it's more secure to have fragment and final query separated.

No source file, test, or entry point is named. Start by reviewing how the sql template handles PromiseLike values and how query fragments are represented; done means a supported non-executable fragment API can be returned from an async helper without triggering query execution.