document search option "pluck" is rejected by TypeScript

[mikecat]

The README.md says:

When using pluck instead of "field" you can explicitly select just one field and get back a flat representation:

index.search(query, { pluck: "title", enrich: true });

However, actually using this option in a TypeScript code (by copy-and-pasting the example) resulted in an error.

Environment:

• Windows 11 Home 23H2
• Node.js v20.12.2
• TypeScript 5.4.5
• FlexSearch 0.7.43

Source file test-pluck.ts:

import { Document } from "flexsearch";

const index = new Document({
  encode: (str) => str.split(" "),
  document: {
    id: "id",
    index: "title",
  },
});

index.add(0, { title: "test hoge" });

const query = "test";
const res = index.search(query, { pluck: "title", enrich: true });
console.log(res);

Commands:

npm i -D typescript
npm i flexsearch
npx tsc test-pluck.ts

Result (error):

test-pluck.ts:14:19 - error TS2769: No overload matches this call.
  Overload 1 of 4, '(query: string, limit?: number): SimpleDocumentSearchResultSetUnit[]', gave the following error.
    Argument of type '{ pluck: string; enrich: boolean; }' is not assignable to parameter of type 'number'.
  Overload 2 of 4, '(query: string, options: string[] | Partial<DocumentSearchOptions<boolean>>): SimpleDocumentSearchResultSetUnit[]', gave the following error.
    Object literal may only specify known properties, and 'pluck' does not exist in type 'string[] | Partial<DocumentSearchOptions<boolean>>'.
  Overload 3 of 4, '(query: string, limit?: number, options?: Partial<DocumentSearchOptions<false>>): SimpleDocumentSearchResultSetUnit[]', gave the following error.
    Argument of type '{ pluck: string; enrich: boolean; }' is not assignable to parameter of type 'number'.

14 const res = index.search(query, { pluck: "title", enrich: true });
                     ~~~~~~



Found 1 error in test-pluck.ts:14