fix: add Client and methods for Svelte Context; add onError handling in receiveFn()

Author: cicerchia

src/lib/client.ts

@@ -0,0 +1,15 @@
+export interface GlobalOptions {
+  onError?: (error: Error) => void;
+}
+
+export interface Client {
+  options: GlobalOptions;
+}
+
+const defaultGlobalOptions: GlobalOptions = {};
+
+export const newClient = (options: GlobalOptions): Client => {
+  options = { ...defaultGlobalOptions, ...options };
+
+  return { options };
+};

src/lib/context.ts

@@ -0,0 +1,16 @@
+import { setContext, getContext } from "svelte";
+
+import type { Client, GlobalOptions } from "./client";
+import { newClient } from "./client";
+
+const key = "@cicerchie_svelte-swr";
+
+export const getClient = (): Client => getContext(key);
+
+export const setClient = (client: Client): void => setContext(key, client);
+
+export const initClient = (options: GlobalOptions): Client => {
+  const client = newClient(options);
+  setClient(client);
+  return client;
+};

src/lib/index.ts

@@ -1,3 +1,4 @@
 export { getValuesFromCacheByKeysStartingWith } from "./cache";
+export { initClient } from "./context";
 export { globalIsFetching } from "./indicator";
 export { useSWR } from "./swr";

src/lib/swr.ts

@@ -3,6 +3,8 @@ import { newFSM } from "@cicerchie/fsm";
 import { writable } from "svelte/store";
 
 import { swrMachine } from "./machine";
+import { getClient } from "./context";
+import { newClient } from "./client";
 
 interface SWROptions<T> {
   enabled?: boolean;
@@ -45,6 +47,8 @@ const defaultSWRParams = {
 };
 
 export function useSWR<T>(): SWRStore<T> {
+  const client = getClient() || newClient({});
+
   // const store = writable<SWRStore<T>>({ ...defaultSWRStore }, () => {
   //   fsm.setEnabled(true);
   //   return () => {
@@ -56,7 +60,13 @@ export function useSWR<T>(): SWRStore<T> {
   const fsm = newFSM({
     config: swrMachine,
     context: { ...defaultSWRStore },
-    receiveFn: (state, ctx) => store.set({ state, ...ctx }),
+    receiveFn: (state, ctx) => {
+      store.set({ state, ...ctx });
+
+      if (client.options.onError && ctx.error) {
+        client.options.onError(ctx.error);
+      }
+    },
   });
 
   function update(params: SWRParams<T>) {