wip: generate codeframe for compiler deprecations

packages/vue-compat/src/index.ts

@@ -1,7 +1,7 @@
 // This entry is the "full-build" that includes both the runtime
 // and the compiler, and supports on-the-fly compilation of the template option.
 import { initDev } from './dev'
-import { compile, CompilerOptions, CompilerError } from '@vue/compiler-dom'
+import { compile, CompilerError, CompilerOptions } from '@vue/compiler-dom'
 import {
   registerRuntimeCompiler,
   RenderFunction,
@@ -55,27 +55,32 @@ function compileToFunction(
     extend(
       {
         hoistStatic: true,
-        onError(err: CompilerError) {
+        onError(err) {
           if (__DEV__) {
-            const message = `Template compilation error: ${err.message}`
-            const codeFrame =
-              err.loc &&
-              generateCodeFrame(
-                template as string,
-                err.loc.start.offset,
-                err.loc.end.offset
-              )
-            warn(codeFrame ? `${message}\n${codeFrame}` : message)
+            onError(err)
           } else {
             /* istanbul ignore next */
             throw err
           }
-        }
-      },
+        },
+        onWarn: __DEV__ ? onError : NOOP
+      } as CompilerOptions,
       options
     )
   )
 
+  function onError(err: CompilerError) {
+    const message = `Template compilation error: ${err.message}`
+    const codeFrame =
+      err.loc &&
+      generateCodeFrame(
+        template as string,
+        err.loc.start.offset,
+        err.loc.end.offset
+      )
+    warn(codeFrame ? `${message}\n${codeFrame}` : message)
+  }
+
   // The wildcard import results in a huge object with every export
   // with keys that cannot be mangled, and can be quite heavy size-wise.
   // In the global build we know `Vue` is available globally so we can avoid