Getting error in Index.ts( Module is not decalred)

import { IProps, MultiSelectControl } from "./MultiSelect";

import { defaultProps } from "react-select/src/Select";

The manifest file provided by is working on singleLine of text but according to our filtering criteria we have modifed it to Lookup.Simple so that we can later use Javascript to get contacts whicch are associated with account and resloved some type error but above two lines is giving error with module is not decalred and 'defaultProps', 'Multislect' are used but not never declared.

We are using this pcf on field of appointment entity to get muli contact in that field. This entities also have account lookup and based on account we need to filter solution.

Can you please look into this issue and also if you can provide altenative solution

Start with Index.ts and inspect the imports from ./MultiSelect and react-select/src/Select, then run the project's TypeScript build or type check. Confirm which module and exports are available in the installed dependencies; done means the control compiles without the reported undeclared-module and missing-name errors.