[#371] Add ConfigurationBuilder for flexible config management

Author: feelform

lib/config.js

@@ -12,6 +12,8 @@ const log = require('./utils/log/logger')
 const ServiceConfigBuilder = require('./client/retry/service-config-builder')
 const { randomBytes } = require('node:crypto')
 const levels = require('loglevel').levels
+const defaultConfig = require('./pinpoint-config-default')
+
 
 const valueOfString = (envName) => {
   return () => {
@@ -238,7 +240,7 @@ class ConfigBuilder {
 
   build() {
     if (!this.defaultJson) {
-      this.defaultJson = require('./pinpoint-config-default')
+      this.defaultJson = defaultConfig
     }
 
     if (!this.userDefinedJson) {