fix(ts): fix type errors

[delagen]

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Fix TS errors when using PowerSync packages for build via Vite multiple errors

    TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead. [plugin angular-compiler]
    
        node_modules/.../wa-sqlite/src/types/index.d.ts:1157:2:
          1130 │   export = ModuleFactory;
               ╵   ~~~~~~~~~~~~~~~~~~~~~~~
    
    TS7006: Parameter 'db' implicitly has an 'any' type. [plugin angular-compiler]
    
        node_modules/.../wa-sqlite/src/types/index.d.ts:357:10:
          357 │   changes(db): number;
              ╵           ~~
    
    TS7006: Parameter 'db' implicitly has an 'any' type. [plugin angular-compiler]
    
        node_modules/.../wa-sqlite/src/types/index.d.ts:381:8:
          381 │   close(db): Promise<number>;
              ╵         ~~
    
    TS7010: 'progress_handler', which lacks return-type annotation, implicitly has an 'any' return type. [plugin angular-compiler]
    
        node_modules/.../wa-sqlite/src/types/index.d.ts:634:2:
          634 │   progress_handler(db: number, nProgressOps: number, handler: (us...
              ╵   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
    TS7006: Parameter 'userData' implicitly has an 'any' type. [plugin angular-compiler]
    
        node_modules/.../wa-sqlite/src/types/index.d.ts:634:105:
          634 │ ...r, handler: (userData: any) => number|Promise<number>, userData);
              ╵                                                           ~~~~~~~~

[gemini-code-assist]

Code Review

This pull request cleans up trailing whitespaces, adds explicit types to several function parameters (such as changes, close, and progress_handler), and updates module exports to use export default in src/types/index.d.ts. The reviewer suggested introducing a generic type parameter T for userData in progress_handler to improve type safety, along with a minor formatting adjustment.

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[delagen]

@rhashimoto @shoestringr please take a look

[rhashimoto]

Thanks for the PR! I rarely use Typescript and know nothing about Vite, but the changes look fine AFAICT. Just fix one format nitpick and I'll merge.