Some type imports (interfaces) (#2887)

* Some type imports (interfaces)

* Additional

* Additional

* Small movements/fixes

* Additional

* Additional

* Unsaved...

packages/rpc-core/src/index.ts

@@ -1,16 +1,18 @@
 // Copyright 2017-2020 @polkadot/rpc-core authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { ProviderInterface, ProviderInterfaceCallback } from '@polkadot/rpc-provider/types';
-import { Hash } from '@polkadot/types/interfaces';
-import { AnyJson, Codec, DefinitionRpc, DefinitionRpcExt, DefinitionRpcSub, Registry } from '@polkadot/types/types';
-import { RpcInterface, RpcInterfaceMethod } from './types';
+import type { Observer } from 'rxjs';
+import type { ProviderInterface, ProviderInterfaceCallback } from '@polkadot/rpc-provider/types';
+import type { StorageKey, Vec } from '@polkadot/types';
+import type { Hash } from '@polkadot/types/interfaces';
+import type { AnyJson, Codec, DefinitionRpc, DefinitionRpcExt, DefinitionRpcSub, Registry } from '@polkadot/types/types';
+import type { RpcInterface, RpcInterfaceMethod } from './types';
 
 import memoizee from 'memoizee';
-import { Observable, Observer } from 'rxjs';
+import { Observable } from 'rxjs';
 import { publishReplay, refCount } from 'rxjs/operators';
 import jsonrpc from '@polkadot/types/interfaces/jsonrpc';
-import { Option, StorageKey, Vec } from '@polkadot/types';
+import { Option } from '@polkadot/types';
 import { createClass, createTypeUnsafe } from '@polkadot/types/create';
 import { assert, hexToU8a, isFunction, isNull, isUndefined, logger, u8aToU8a } from '@polkadot/util';
 

packages/rpc-core/src/methodSend.spec.ts

@@ -1,7 +1,7 @@
 // Copyright 2017-2020 @polkadot/rpc-core authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { DefinitionRpc } from '@polkadot/types/types';
+import type { DefinitionRpc } from '@polkadot/types/types';
 
 import { TypeRegistry } from '@polkadot/types/create';
 

packages/rpc-core/src/replay.spec.ts

@@ -1,7 +1,9 @@
 // Copyright 2017-2020 @polkadot/rpc-core authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { Observable, of } from 'rxjs';
+import type { Observable } from 'rxjs';
+
+import { of } from 'rxjs';
 import { MockProvider } from '@polkadot/rpc-provider/mock';
 import { TypeRegistry } from '@polkadot/types/create';
 

packages/rpc-core/src/types.jsonrpc.ts

@@ -3,7 +3,7 @@
 
 // FIXME, this whole file needs to move to API
 
-import { AnyFunction } from '@polkadot/types/types';
+import type { AnyFunction } from '@polkadot/types/types';
 
 // eslint-disable-next-line @typescript-eslint/no-empty-interface
 export interface RpcInterface {}

packages/rpc-core/src/types.ts

@@ -1,7 +1,7 @@
 // Copyright 2017-2020 @polkadot/rpc-core authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { Observable } from 'rxjs';
+import type { Observable } from 'rxjs';
 
 export * from './types.jsonrpc';
 

packages/rpc-core/src/util/drr.ts

@@ -1,7 +1,7 @@
 // Copyright 2017-2020 @polkadot/rpc-core authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { Observable } from 'rxjs';
+import type { Observable } from 'rxjs';
 
 import { catchError, distinctUntilChanged, publishReplay, tap, refCount } from 'rxjs/operators';
 import { logger } from '@polkadot/util';