BigInt support (& some TS typing cleanups) (#1919)

* Some TS typing cleanups

* docs building again

* yarn.lock rewrite

* tweaks

* BigInt support

* Checktypes with BigInt

* AccountIndex support for BigInt

* Fix ApiPromise signAsync

packages/metadata/src/Decorated/extrinsics/fromMetadata/createUnchecked.ts

@@ -3,7 +3,7 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import { Call } from '@polkadot/types/interfaces';
-import { AnyJsonObject, CallFunction, Registry, RegistryMetadataCall } from '@polkadot/types/types';
+import { AnyJson, CallFunction, Registry, RegistryMetadataCall } from '@polkadot/types/types';
 
 // we do a direct import here to remove all circular dependencies (importing from
 // /types, /types/codec or /types/create makes all hell break loose)
@@ -31,7 +31,7 @@ export default function createDescriptor (registry: Registry, section: string, s
   extrinsicFn.meta = callMetadata;
   extrinsicFn.method = funcName;
   extrinsicFn.section = section;
-  extrinsicFn.toJSON = (): string | AnyJsonObject =>
+  extrinsicFn.toJSON = (): AnyJson =>
     callMetadata.toJSON();
 
   return extrinsicFn as CallFunction;

packages/metadata/src/Metadata/util/toCallsOnly.ts

@@ -3,12 +3,12 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import { MetadataLatest } from '@polkadot/types/interfaces/metadata';
-import { AnyJsonObject, Registry } from '@polkadot/types/types';
+import { AnyJson, Registry } from '@polkadot/types/types';
 
 import { createType } from '@polkadot/types/create';
 
 /** @internal */
-export default function toCallsOnly (registry: Registry, { extrinsic, modules }: MetadataLatest): AnyJsonObject | string {
+export default function toCallsOnly (registry: Registry, { extrinsic, modules }: MetadataLatest): AnyJson {
   return createType(registry, 'MetadataLatest', {
     // FIXME, this needs typing, not any
     modules: modules.map(({ calls, name }): any => ({