typescript conversion of teh file

app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.ts

@@ -0,0 +1,65 @@
+import type {
+  JsonRpcEngineNextCallback,
+  JsonRpcEngineEndCallback,
+} from '@metamask/json-rpc-engine';
+import type {
+  JsonRpcRequest,
+  PendingJsonRpcResponse,
+  JsonRpcParams,
+} from '@metamask/utils';
+import { MESSAGE_TYPE } from '../../../../../shared/constants/app';
+import {
+  HandlerWrapper,
+  GetProviderState,
+  ProviderStateHandlerResult,
+} from './handlers-helper';
+
+type GetProviderStateConstraint<Params extends JsonRpcParams = JsonRpcParams> =
+  {
+    implementation: (
+      _req: JsonRpcRequest<Params>,
+      res: PendingJsonRpcResponse<ProviderStateHandlerResult>,
+      _next: JsonRpcEngineNextCallback,
+      end: JsonRpcEngineEndCallback,
+      { _getProviderState }: Record<string, GetProviderState>,
+    ) => Promise<void>;
+  } & HandlerWrapper;
+
+/**
+ * This RPC method gets background state relevant to the provider.
+ * The background sends RPC notifications on state changes, but the provider
+ * first requests state on initialization.
+ */
+const getProviderState = {
+  methodNames: [MESSAGE_TYPE.GET_PROVIDER_STATE],
+  implementation: getProviderStateHandler,
+  hookNames: {
+    getProviderState: true,
+  },
+} satisfies GetProviderStateConstraint;
+
+export default getProviderState;
+
+/**
+ * @param req - The JSON-RPC request object.
+ * @param res - The JSON-RPC response object.
+ * @param _next - The json-rpc-engine 'next' callback.
+ * @param end - The json-rpc-engine 'end' callback.
+ * @param options
+ * @param options.getProviderState - An async function that gets the current provider state.
+ */
+async function getProviderStateHandler<
+  Params extends JsonRpcParams = JsonRpcParams,
+>(
+  req: JsonRpcRequest<Params>,
+  res: PendingJsonRpcResponse<ProviderStateHandlerResult>,
+  _next: JsonRpcEngineNextCallback,
+  end: JsonRpcEngineEndCallback,
+  { getProviderState: _getProviderState }: Record<string, GetProviderState>,
+): Promise<void> {
+  const { origin } = req.origin;
+  res.result = {
+    ...(await _getProviderState(origin)),
+  };
+  return end();
+}