Use .js imports in src (#5526)

* Use .js imports in src

* Adjust

* Fix imports

* Bump dev

* Adjust with .js imports for typegen

* Adjust

* Adjust

* Remove target override

packages/api-derive/src/elections/index.ts

@@ -1,4 +1,4 @@
 // Copyright 2017-2023 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-export * from './info';
+export * from './info.js';

packages/api-derive/src/elections/info.ts

@@ -6,14 +6,14 @@ import type { u32, Vec } from '@polkadot/types';
 import type { AccountId32, Balance, BlockNumber } from '@polkadot/types/interfaces';
 import type { PalletElectionsPhragmenSeatHolder } from '@polkadot/types/lookup';
 import type { ITuple } from '@polkadot/types/types';
-import type { DeriveApi } from '../types';
-import type { DeriveElectionsInfo } from './types';
+import type { DeriveApi } from '../types.js';
+import type { DeriveElectionsInfo } from './types.js';
 
 import { combineLatest, map, of } from 'rxjs';
 
 import { objectSpread } from '@polkadot/util';
 
-import { memo } from '../util';
+import { memo } from '../util/index.js';
 
 // SeatHolder is current tuple is 2.x-era Substrate
 type Member = PalletElectionsPhragmenSeatHolder | ITuple<[AccountId32, Balance]>;