Load GraphQL schema from file for autocomplete (#462)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Gregory Schier <gschier1990@gmail.com>

apps/yaak-client/lib/graphqlSchema.ts

@@ -0,0 +1,51 @@
+import type { GraphQLSchema, IntrospectionQuery } from "graphql";
+import { buildClientSchema, buildSchema, introspectionFromSchema } from "graphql";
+
+// Accepts either a GraphQL introspection JSON ({ data: { __schema } } or
+// { __schema }) or an SDL string and normalizes both into the wrapped
+// { data: <introspection> } JSON shape used by the introspection store.
+export function tryBuildIntrospectionFromFile(
+  fileContent: string,
+): { schema: GraphQLSchema; content: string } | { error: string } {
+  let parsedJson: unknown;
+  try {
+    parsedJson = JSON.parse(fileContent);
+  } catch {
+    parsedJson = undefined;
+  }
+
+  if (parsedJson != null && typeof parsedJson === "object") {
+    const candidates: unknown[] = [(parsedJson as { data?: unknown }).data, parsedJson];
+
+    for (const candidate of candidates) {
+      if (
+        candidate != null &&
+        typeof candidate === "object" &&
+        "__schema" in (candidate as Record<string, unknown>)
+      ) {
+        try {
+          const schema = buildClientSchema(candidate as IntrospectionQuery, {});
+          return { schema, content: JSON.stringify({ data: candidate }) };
+        } catch (e) {
+          return {
+            error: `Failed to build schema from introspection JSON: ${errorMessage(e)}`,
+          };
+        }
+      }
+    }
+  }
+
+  try {
+    const schema = buildSchema(fileContent);
+    const introspection = introspectionFromSchema(schema);
+    return { schema, content: JSON.stringify({ data: introspection }) };
+  } catch (e) {
+    return {
+      error: `Could not parse file as introspection JSON or GraphQL SDL: ${errorMessage(e)}`,
+    };
+  }
+}
+
+function errorMessage(e: unknown): string {
+  return e instanceof Error ? e.message : String(e);
+}