From 9807c250df6c27c6f152cd4a6289f0a4a61474a8 Mon Sep 17 00:00:00 2001
From: Niranjana Binoy <43930900+NiranjanaBinoy@users.noreply.github.com>
Date: Wed, 27 Mar 2024 17:04:02 -0400
Subject: [PATCH] typescript conversion of teh file

---
 .../handlers/get-provider-state.js            | 49 --------------
 .../handlers/get-provider-state.ts            | 65 +++++++++++++++++++
 2 files changed, 65 insertions(+), 49 deletions(-)
 delete mode 100644 app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.js
 create mode 100644 app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.ts

diff --git a/app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.js b/app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.js
deleted file mode 100644
index 70dbb7b16cfa..000000000000
--- a/app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.js
+++ /dev/null
@@ -1,49 +0,0 @@
-import { MESSAGE_TYPE } from '../../../../../shared/constants/app';
-
-/**
- * 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,
-  },
-};
-export default getProviderState;
-
-/**
- * @typedef {object} ProviderStateHandlerResult
- * @property {string} chainId - The current chain ID.
- * @property {boolean} isUnlocked - Whether the extension is unlocked or not.
- * @property {string} networkVersion - The current network ID.
- */
-
-/**
- * @typedef {object} ProviderStateHandlerOptions
- * @property {() => ProviderStateHandlerResult} getProviderState - A function that
- * gets the current provider state.
- */
-
-/**
- * @param {import('json-rpc-engine').JsonRpcRequest<[]>} req - The JSON-RPC request object.
- * @param {import('json-rpc-engine').JsonRpcResponse<ProviderStateHandlerResult>} res - The JSON-RPC response object.
- * @param {Function} _next - The json-rpc-engine 'next' callback.
- * @param {Function} end - The json-rpc-engine 'end' callback.
- * @param {ProviderStateHandlerOptions} options
- */
-async function getProviderStateHandler(
-  req,
-  res,
-  _next,
-  end,
-  { getProviderState: _getProviderState },
-) {
-  res.result = {
-    ...(await _getProviderState(req.origin)),
-  };
-  return end();
-}
diff --git a/app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.ts b/app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.ts
new file mode 100644
index 000000000000..b5c3daca24ef
--- /dev/null
+++ b/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();
+}