refactor: move actionHandler to helper fn

packages/astro/templates/actions.mjs

@@ -3,45 +3,11 @@ import { ActionError, callSafely } from 'astro:actions';
 function toActionProxy(actionCallback = {}, aggregatedPath = '/_actions/') {
 	return new Proxy(actionCallback, {
 		get(target, objKey) {
-			const path = aggregatedPath + objKey.toString();
 			if (objKey in target) {
 				return target[objKey];
 			}
-			// `callerParam` is the argument passed to the action when used on the client.
-			// Usage: `actions.[name](callerParam)`.
-			async function action(callerParam) {
-				if (import.meta.env.SSR) {
-					throw new ActionError({
-						code: 'BAD_REQUEST',
-						message:
-							'Action unexpectedly called on the server. If this error is unexpected, share your feedback on our RFC discussion: https://github.com/withastro/roadmap/pull/912',
-					});
-				}
-				const headers = new Headers();
-				headers.set('Accept', 'application/json');
-				let body = callerParam;
-				if (!(body instanceof FormData)) {
-					try {
-						body = callerParam ? JSON.stringify(callerParam) : undefined;
-					} catch (e) {
-						throw new ActionError({
-							code: 'BAD_REQUEST',
-							message: `Failed to serialize request body to JSON. Full error: ${e.message}`,
-						});
-					}
-					headers.set('Content-Type', 'application/json');
-				}
-				const res = await fetch(path, {
-					method: 'POST',
-					body,
-					headers,
-				});
-				if (!res.ok) {
-					throw await ActionError.fromResponse(res);
-				}
-				const json = await res.json();
-				return json;
-			}
+			const path = aggregatedPath + objKey.toString();
+			const action = (clientParam) => actionHandler(clientParam, path);
 			action.toString = () => path;
 			action.safe = (input) => {
 				return callSafely(() => action(input));
@@ -53,4 +19,43 @@ function toActionProxy(actionCallback = {}, aggregatedPath = '/_actions/') {
 	});
 }
 
+/**
+ * @param {*} clientParam argument passed to the action when used on the client.
+ * @param {string} path Built path to call action on the server.
+ * Usage: `actions.[name](clientParam)`.
+ */
+async function actionHandler(clientParam, path) {
+	if (import.meta.env.SSR) {
+		throw new ActionError({
+			code: 'BAD_REQUEST',
+			message:
+				'Action unexpectedly called on the server. If this error is unexpected, share your feedback on our RFC discussion: https://github.com/withastro/roadmap/pull/912',
+		});
+	}
+	const headers = new Headers();
+	headers.set('Accept', 'application/json');
+	let body = clientParam;
+	if (!(body instanceof FormData)) {
+		try {
+			body = clientParam ? JSON.stringify(clientParam) : undefined;
+		} catch (e) {
+			throw new ActionError({
+				code: 'BAD_REQUEST',
+				message: `Failed to serialize request body to JSON. Full error: ${e.message}`,
+			});
+		}
+		headers.set('Content-Type', 'application/json');
+	}
+	const res = await fetch(path, {
+		method: 'POST',
+		body,
+		headers,
+	});
+	if (!res.ok) {
+		throw await ActionError.fromResponse(res);
+	}
+	const json = await res.json();
+	return json;
+}
+
 export const actions = toActionProxy();