diff --git a/webview-ui/.eslintrc.json b/webview-ui/.eslintrc.json
new file mode 100644
index 0000000..0c69367
--- /dev/null
+++ b/webview-ui/.eslintrc.json
@@ -0,0 +1,40 @@
+{
+	"root": true,
+	"extends": [
+		"eslint:recommended",
+		"plugin:react/recommended",
+		"plugin:@typescript-eslint/recommended",
+		"plugin:react-hooks/recommended"
+	],
+	"parser": "@typescript-eslint/parser",
+	"plugins": ["react", "@typescript-eslint", "react-hooks"],
+	"rules": {
+		"react/react-in-jsx-scope": "off",
+		"@typescript-eslint/explicit-module-boundary-types": "off",
+		"@typescript-eslint/no-explicit-any": "warn",
+		"react/display-name": "warn",
+		"no-case-declarations": "warn",
+		"react/no-unescaped-entities": "warn",
+		"react/jsx-key": "warn",
+		"no-extra-semi": "warn",
+		"@typescript-eslint/no-var-requires": "warn",
+		"@typescript-eslint/no-unused-vars": [
+			"warn",
+			{
+				"argsIgnorePattern": "^_",
+				"varsIgnorePattern": "^_",
+				"caughtErrorsIgnorePattern": "^_"
+			}
+		]
+	},
+	"settings": {
+		"react": {
+			"version": "detect"
+		}
+	},
+	"env": {
+		"browser": true,
+		"es2021": true,
+		"node": true
+	}
+}
diff --git a/webview-ui/src/components/chat/ChatRow.tsx b/webview-ui/src/components/chat/ChatRow.tsx
index ffa340e..1ec109f 100644
--- a/webview-ui/src/components/chat/ChatRow.tsx
+++ b/webview-ui/src/components/chat/ChatRow.tsx
@@ -89,7 +89,7 @@ export const ChatRowContent = ({
 		}
 	}, [isLast, message.say])
 	const [cost, apiReqCancelReason, apiReqStreamingFailedMessage] = useMemo(() => {
-		if (message.text && message.say === "api_req_started") {
+		if (message.text != null && message.say === "api_req_started") {
 			const info: ClineApiReqInfo = JSON.parse(message.text)
 			return [info.cost, info.cancelReason, info.streamingFailedMessage]
 		}
@@ -183,26 +183,26 @@ export const ChatRowContent = ({
 					</div>
 				)
 				return [
-					apiReqCancelReason !== null ? (
+					apiReqCancelReason != null ? (
 						apiReqCancelReason === "user_cancelled" ? (
 							getIconSpan("error", cancelledColor)
 						) : (
 							getIconSpan("error", errorColor)
 						)
-					) : cost !== null ? (
+					) : cost != null ? (
 						getIconSpan("check", successColor)
 					) : apiRequestFailedMessage ? (
 						getIconSpan("error", errorColor)
 					) : (
 						<ProgressIndicator />
 					),
-					apiReqCancelReason !== null ? (
+					apiReqCancelReason != null ? (
 						apiReqCancelReason === "user_cancelled" ? (
 							<span style={{ color: normalColor, fontWeight: "bold" }}>API Request Cancelled</span>
 						) : (
 							<span style={{ color: errorColor, fontWeight: "bold" }}>API Streaming Failed</span>
 						)
-					) : cost !== null ? (
+					) : cost != null ? (
 						<span style={{ color: normalColor, fontWeight: "bold" }}>API Request</span>
 					) : apiRequestFailedMessage ? (
 						<span style={{ color: errorColor, fontWeight: "bold" }}>API Request Failed</span>
@@ -510,7 +510,7 @@ export const ChatRowContent = ({
 								style={{
 									...headerStyle,
 									marginBottom:
-										(cost === null && apiRequestFailedMessage) || apiReqStreamingFailedMessage
+										(cost == null && apiRequestFailedMessage) || apiReqStreamingFailedMessage
 											? 10
 											: 0,
 									justifyContent: "space-between",
@@ -524,13 +524,13 @@ export const ChatRowContent = ({
 								<div style={{ display: "flex", alignItems: "center", gap: "10px", flexGrow: 1 }}>
 									{icon}
 									{title}
-									<VSCodeBadge style={{ opacity: cost ? 1 : 0 }}>
+									<VSCodeBadge style={{ opacity: cost != null && cost > 0 ? 1 : 0 }}>
 										${Number(cost || 0)?.toFixed(4)}
 									</VSCodeBadge>
 								</div>
 								<span className={`codicon codicon-chevron-${isExpanded ? "up" : "down"}`}></span>
 							</div>
-							{((cost === null && apiRequestFailedMessage) || apiReqStreamingFailedMessage) && (
+							{((cost == null && apiRequestFailedMessage) || apiReqStreamingFailedMessage) && (
 								<>
 									<p style={{ ...pStyle, color: "var(--vscode-errorForeground)" }}>
 										{apiRequestFailedMessage || apiReqStreamingFailedMessage}
diff --git a/webview-ui/src/components/chat/ChatView.tsx b/webview-ui/src/components/chat/ChatView.tsx
index 3f58c7a..519b7e5 100644
--- a/webview-ui/src/components/chat/ChatView.tsx
+++ b/webview-ui/src/components/chat/ChatView.tsx
@@ -275,7 +275,7 @@ const ChatView = ({ isHidden, showAnnouncement, hideAnnouncement, showHistoryVie
 			return true
 		} else {
 			const lastApiReqStarted = findLast(modifiedMessages, (message) => message.say === "api_req_started")
-			if (lastApiReqStarted && lastApiReqStarted.text && lastApiReqStarted.say === "api_req_started") {
+			if (lastApiReqStarted && lastApiReqStarted.text != null && lastApiReqStarted.say === "api_req_started") {
 				const cost = JSON.parse(lastApiReqStarted.text).cost
 				if (cost === undefined) {
 					// api request has not finished yet
@@ -718,9 +718,9 @@ const ChatView = ({ isHidden, showAnnouncement, hideAnnouncement, showHistoryVie
 				if (message.say === "api_req_started") {
 					// get last api_req_started in currentGroup to check if it's cancelled. If it is then this api req is not part of the current browser session
 					const lastApiReqStarted = [...currentGroup].reverse().find((m) => m.say === "api_req_started")
-					if (lastApiReqStarted?.text) {
+					if (lastApiReqStarted?.text != null) {
 						const info = JSON.parse(lastApiReqStarted.text)
-						const isCancelled = info.cancelReason !== null
+						const isCancelled = info.cancelReason != null
 						if (isCancelled) {
 							endBrowserSession()
 							result.push(message)
diff --git a/webview-ui/src/components/welcome/WelcomeView.tsx b/webview-ui/src/components/welcome/WelcomeView.tsx
index d72d856..3e3bbd7 100644
--- a/webview-ui/src/components/welcome/WelcomeView.tsx
+++ b/webview-ui/src/components/welcome/WelcomeView.tsx
@@ -10,7 +10,7 @@ const WelcomeView = () => {
 
 	const [apiErrorMessage, setApiErrorMessage] = useState<string | undefined>(undefined)
 
-	const disableLetsGoButton = !!apiErrorMessage
+	const disableLetsGoButton = apiErrorMessage != null
 
 	const handleSubmit = () => {
 		vscode.postMessage({ type: "apiConfiguration", apiConfiguration })