Add temporary assertions for catching goja values

This commit is intentionally failing

common/execution_context.go

@@ -154,6 +154,9 @@ func (e *ExecutionContext) adoptElementHandle(eh *ElementHandle) (*ElementHandle
 func (e *ExecutionContext) eval(
 	apiCtx context.Context, opts evalOptions, js string, args ...any,
 ) (any, error) {
+	if escapesGojaValues(args...) {
+		return nil, errors.New("goja.Value escaped")
+	}
 	e.logger.Debugf(
 		"ExecutionContext:eval",
 		"sid:%s stid:%s fid:%s ectxid:%d furl:%q %s",
@@ -289,6 +292,9 @@ func (e *ExecutionContext) getInjectedScript(apiCtx context.Context) (JSHandleAP
 // Eval evaluates the provided JavaScript within this execution context and
 // returns a value or handle.
 func (e *ExecutionContext) Eval(apiCtx context.Context, js string, args ...any) (any, error) {
+	if escapesGojaValues(args...) {
+		return nil, errors.New("goja.Value escaped")
+	}
 	opts := evalOptions{
 		forceCallable: true,
 		returnByValue: true,
@@ -303,6 +309,9 @@ func (e *ExecutionContext) Eval(apiCtx context.Context, js string, args ...any)
 // EvalHandle evaluates the provided JavaScript within this execution context
 // and returns a JSHandle.
 func (e *ExecutionContext) EvalHandle(apiCtx context.Context, js string, args ...any) (JSHandleAPI, error) {
+	if escapesGojaValues(args...) {
+		return nil, errors.New("goja.Value escaped")
+	}
 	opts := evalOptions{
 		forceCallable: true,
 		returnByValue: false,

common/helpers.go

@@ -3,6 +3,7 @@ package common
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"math"
 	"time"
@@ -35,6 +36,9 @@ func convertBaseJSHandleTypes(ctx context.Context, execCtx *ExecutionContext, ob
 func convertArgument(
 	ctx context.Context, execCtx *ExecutionContext, arg any,
 ) (*cdpruntime.CallArgument, error) {
+	if escapesGojaValues(arg) {
+		return nil, errors.New("goja.Value escaped")
+	}
 	switch a := arg.(type) {
 	case int64:
 		if a > math.MaxInt32 {
@@ -247,3 +251,15 @@ func convert[T any](from any, to *T) error {
 	}
 	return json.Unmarshal(buf, to) //nolint:wrapcheck
 }
+
+// TODO:
+// remove this temporary helper after ensuring the goja-free
+// business logic works.
+func escapesGojaValues(args ...any) bool {
+	for _, arg := range args {
+		if _, ok := arg.(goja.Value); ok {
+			return true
+		}
+	}
+	return false
+}