frontend-plugin-api: always warn on deprecated config.schema with call site

Instead of a one-time warning, emit a deprecation warning every time
an extension is created using the deprecated `config.schema` option,
including the call site location to help track down each usage.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/frontend-plugin-api/src/schema/createPortableSchema.ts

@@ -323,17 +323,13 @@ function formatStandardIssue(
   return `${message} at '${path}'`;
 }
 
-let hasWarnedConfigSchemaProp = false;
-
 /** @internal */
-export function warnConfigSchemaPropDeprecation() {
-  if (!hasWarnedConfigSchemaProp) {
-    hasWarnedConfigSchemaProp = true;
-    // eslint-disable-next-line no-console
-    console.warn(
-      'DEPRECATION WARNING: The `config.schema` option for extension config is deprecated. ' +
-        'Use the `configSchema` option instead with Standard Schema values, for example ' +
-        '`configSchema: { title: z.string() }` using zod v3.25+ or v4.',
-    );
-  }
+export function warnConfigSchemaPropDeprecation(callSite: string) {
+  // eslint-disable-next-line no-console
+  console.warn(
+    `DEPRECATION WARNING: The \`config.schema\` option for extension config is deprecated. ` +
+      `Use the \`configSchema\` option instead with Standard Schema values, for example ` +
+      `\`configSchema: { title: z.string() }\` using zod v3.25+ or v4. ` +
+      `Declared at ${callSite}`,
+  );
 }

packages/frontend-plugin-api/src/wiring/createExtension.ts

@@ -31,6 +31,7 @@ import {
   createConfigSchema,
   warnConfigSchemaPropDeprecation,
 } from '../schema/createPortableSchema';
+import { describeParentCallSite } from '../routing/describeParentCallSite';
 import { type StandardSchemaV1 } from '@standard-schema/spec';
 import { OpaqueExtensionDefinition } from '@internal/frontend';
 import { ExtensionDataContainer } from './types';
@@ -646,7 +647,7 @@ export function createExtension(
   const schemaDeclaration =
     options.configSchema ?? (options.config?.schema as any);
   if (options.config?.schema) {
-    warnConfigSchemaPropDeprecation();
+    warnConfigSchemaPropDeprecation(describeParentCallSite());
   }
   const resolvedConfigSchema =
     schemaDeclaration && createConfigSchema(schemaDeclaration);