restructered some of the internals and added basic js app hooks support

plugins/jsvm/mapper.go

@@ -0,0 +1,48 @@
+package jsvm
+
+import (
+	"reflect"
+	"strings"
+	"unicode"
+
+	"github.com/dop251/goja"
+)
+
+var (
+	_ goja.FieldNameMapper = (*FieldMapper)(nil)
+)
+
+// FieldMapper provides custom mapping between Go and JavaScript property names.
+//
+// It is similar to the builtin "uncapFieldNameMapper" but also converts
+// all uppercase identifiers to their lowercase equivalent (eg. "GET" -> "get").
+type FieldMapper struct {
+}
+
+// FieldName implements the [FieldNameMapper.FieldName] interface method.
+func (u FieldMapper) FieldName(_ reflect.Type, f reflect.StructField) string {
+	return convertGoToJSName(f.Name)
+}
+
+// MethodName implements the [FieldNameMapper.MethodName] interface method.
+func (u FieldMapper) MethodName(_ reflect.Type, m reflect.Method) string {
+	return convertGoToJSName(m.Name)
+}
+
+func convertGoToJSName(name string) string {
+	allUppercase := true
+	for _, c := range name {
+		if c != '_' && !unicode.IsUpper(c) {
+			allUppercase = false
+			break
+		}
+	}
+
+	// eg. "JSON" -> "json"
+	if allUppercase {
+		return strings.ToLower(name)
+	}
+
+	// eg. "GetField" -> "getField"
+	return strings.ToLower(name[0:1]) + name[1:]
+}