Some type imports (interfaces) (#2887)

* Some type imports (interfaces)

* Additional

* Additional

* Small movements/fixes

* Additional

* Additional

* Unsaved...

packages/api-derive/src/util/approvalFlagToBools.spec.ts

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

packages/api-derive/src/util/approvalFlagsToBools.ts

@@ -1,9 +1,8 @@
 // Copyright 2017-2020 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { ApprovalFlag } from '@polkadot/types/interfaces/elections';
-
-import { Vec } from '@polkadot/types';
+import type { ApprovalFlag } from '@polkadot/types/interfaces/elections';
+import type { Vec } from '@polkadot/types';
 
 /** @internal */
 export function approvalFlagsToBools (flags: Vec<ApprovalFlag> | ApprovalFlag[]): boolean[] {
@@ -19,7 +18,9 @@ export function approvalFlagsToBools (flags: Vec<ApprovalFlag> | ApprovalFlag[])
   });
 
   // slice off trailing "false" values, as in substrate
-  const lastApproval: number = bools.lastIndexOf(true);
+  const lastApproval = bools.lastIndexOf(true);
 
-  return lastApproval >= 0 ? bools.slice(0, lastApproval + 1) : [];
+  return lastApproval >= 0
+    ? bools.slice(0, lastApproval + 1)
+    : [];
 }

packages/api-derive/src/util/cache.ts

@@ -1,7 +1,7 @@
 // Copyright 2017-2020 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { DeriveCache } from './types';
+import type { DeriveCache } from './types';
 
 import { deriveNoopCache } from './cacheImpl';
 

packages/api-derive/src/util/cacheImpl.ts

@@ -1,7 +1,7 @@
 // Copyright 2017-2020 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import { DeriveCache } from './types';
+import type { DeriveCache } from './types';
 
 const mapCache = new Map<string, any>();
 

packages/api-derive/src/util/memo.ts

@@ -1,8 +1,10 @@
 // Copyright 2017-2020 @polkadot/api-derive authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { Observer, TeardownLogic } from 'rxjs';
+
 import createMemo from 'memoizee';
-import { Observable, Observer, TeardownLogic } from 'rxjs';
+import { Observable } from 'rxjs';
 import { drr, normalizer } from '@polkadot/rpc-core/util';
 
 type ObsFn <T> = (...params: any[]) => Observable<T>;