feat: replace the ssr/client data blocks with apis blocks

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/syntax/src/parser.ts

@@ -1,10 +1,5 @@
 import { WRN_RUNTIME_TARGETS } from "./spec.ts";
-import {
-  parseApiSections,
-  parseApiEntries,
-  hasRequestSection,
-  type ApiSections,
-} from "./api-sections.ts";
+import { parseApiEntries, type ApiSections } from "./api-sections.ts";
 
 /**
  * Recursive-descent parser for `.wrn`, producing a small AST.
@@ -147,7 +142,7 @@ export interface ApiBlock {
 
 export type SeoBlock = Record<string, string>;
 
-export type DataMode = "ssr" | "client" | "any";
+export type DataMode = "any";
 
 export interface DataApiBlock {
   mode: DataMode;
@@ -669,7 +664,6 @@ export function parse(source: string): PageAst {
         case "client":
         case "server": {
           const rawMode = kw.value;
-          const mode: DataMode = rawMode === "client" ? "client" : "ssr";
           lx.next();
           if (
             (rawMode === "client" || rawMode === "server") &&
@@ -684,56 +678,17 @@ export function parse(source: string): PageAst {
             );
             break;
           }
-          if (mode === "client" && lx.peek().type === "eq") {
+          if (rawMode === "client" && lx.peek().type === "eq") {
             lx.next();
             hydrate = expect("string").value;
             break;
           }
-          expect("lbrace");
-          while (lx.peek().type !== "rbrace") {
-            const member = lx.peek();
-            if (member.type === "eof") {
-              throw new ParseError(`Unexpected end of input inside ${mode} block`);
-            }
-            if (member.type !== "ident") {
-              throw new ParseError(`Expected a ${mode} member keyword at offset ${member.pos}`);
-            }
-            switch (member.value) {
-              case "api": {
-                lx.next();
-                const name = expect("ident").value;
-                const method = expect("ident").value.toUpperCase();
-                const path = lx.readPath();
-                const body = lx.readBalancedBraces();
-                const sections = parseApiSections(body);
-                if (sections && mode !== "client" && hasRequestSection(body)) {
-                  throw new ParseError(
-                    `An ssr api block cannot declare "request": there is no caller at render time to supply it. Use a client block, or a server function.`,
-                  );
-                }
-                dataApis.push({
-                  mode,
-                  name,
-                  method,
-                  path,
-                  body: sections ? "" : body,
-                  ...(sections ? { sections } : {}),
-                });
-                break;
-              }
-              case "functions": {
-                lx.next();
-                modeFunctions.push({ mode, body: lx.readBalancedBraces() });
-                break;
-              }
-              default:
-                throw new ParseError(
-                  `Unknown ${mode} member '${member.value}' at offset ${member.pos}`,
-                );
-            }
+          if (lx.peek().type === "lbrace") {
+            throw new ParseError(
+              `"${rawMode} { … }" data blocks were removed. Declare API calls in a page-level "apis { }" block, and move mode-scoped helpers into "functions { shared function … }".`,
+            );
           }
-          expect("rbrace");
-          break;
+          throw new ParseError(`Expected a ${rawMode} state block or hydrate assignment`);
         }
         case "shared": {
           lx.next();