initial commit, super basic implementation

index.ts

@@ -0,0 +1,48 @@
+const subscribedQueries = new Map<string, (data: any) => void>();
+let ws: WebSocket | null = null;
+
+export const connect = async (url: string): Promise<WebSocket> => {
+    ws = new WebSocket(url);
+    ws.onopen = () => {
+        console.log('Connected to Tether');
+    };
+    ws.onmessage = (event) => {
+        const data = JSON.parse(event.data);
+        if (data.type === 'query') {
+            subscribedQueries.forEach((callback, query) => {
+                if (data.query === query) {
+                    callback(data.data);
+                }
+            });
+        } else if (data.type === 'error') {
+            console.error(data.error);
+        }
+    };
+    ws.onclose = () => {
+        console.log('Disconnected from Tether');
+    };
+    return ws;
+};
+
+export const disconnect = (ws: WebSocket) => {
+    ws.close();
+};
+
+export const subscribe = (query: string, callback: (data: any) => void) => {
+    subscribedQueries.set(query, callback);
+};
+
+export const unsubscribe = (query: string) => {
+    subscribedQueries.delete(query);
+};
+
+export const sendMutation = (mutationName: string, params: any) => {
+    if (!ws) {
+        throw new Error('Not connected to Tether');
+    }
+    ws.send(JSON.stringify({
+        type: 'mutation',
+        name: mutationName,
+        payload: params,
+    }));
+};