NestJS集成i18n异常：返回变量名而非翻译文本求助

我正在开发一个NestJS项目，需求是根据请求头中的语言信息，向前端返回对应语言的错误提示。调研后选用nestjs-i18n方案实现，严格按文档配置完成后，在Postman测试时发现返回的不是JSON文件中定义的翻译文本，而是变量名。比如JSON里定义test对应HelloWorld，实际返回的却是test。

我已经尝试过搜索解决方案、重新核对文档，甚至直接复制负责人已完成i18n配置项目的代码，但问题依然存在。不清楚遗漏了哪些配置，希望能得到帮助。以下是项目中的相关文件：

package.json #

{
  "name": "nest-experiments",
  "version": "0.0.1",
  "description": "",
  "author": "",
  "private": true,
  "license": "UNLICENSED",
  "scripts": {
    "build": "nest build",
    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
    "start": "nest start",
    "start:dev": "nest start --watch",
    "start:debug": "nest start --debug --watch",
    "start:prod": "node dist/main",
    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
    "test": "jest",
    "test:watch": "jest --watch",
    "test:cov": "jest --coverage",
    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
    "test:e2e": "jest --config ./test/jest-e2e.json"
  },
  "dependencies": {
    "@nestjs/common": "^9.0.0",
    "@nestjs/core": "^9.0.0",
    "@nestjs/mongoose": "^9.2.2",
    "@nestjs/platform-express": "^9.0.0",
    "axios": "^1.4.0",
    "class-transformer": "^0.5.1",
    "class-validator": "^0.14.0",
    "mongodb": "^5.5.0",
    "mongoose": "^7.2.1",
    "nestjs-i18n": "^10.2.6",
    "reflect-metadata": "^0.1.13",
    "rxjs": "^7.2.0"
  },
  "devDependencies": {
    "@nestjs/cli": "^9.0.0",
    "@nestjs/schematics": "^9.0.0",
    "@nestjs/testing": "^9.0.0",
    "@types/express": "^4.17.13",
    "@types/jest": "29.5.1",
    "@types/mongoose": "^5.11.97",
    "@types/node": "18.16.12",
    "@types/supertest": "^2.0.11",
    "@typescript-eslint/eslint-plugin": "^5.0.0",
    "@typescript-eslint/parser": "^5.0.0",
    "eslint": "^8.0.1",
    "eslint-config-prettier": "^8.3.0",
    "eslint-plugin-prettier": "^4.0.0",
    "jest": "29.5.0",
    "prettier": "^2.3.2",
    "source-map-support": "^0.5.20",
    "supertest": "^6.1.3",
    "ts-jest": "29.1.0",
    "ts-loader": "^9.2.3",
    "ts-node": "^10.0.0",
    "tsconfig-paths": "4.2.0",
    "typescript": "^5.0.0"
  },
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "ts"
    ],
    "rootDir": "src",
    "testRegex": ".*\\.spec\\.ts$",
    "transform": {
      "^.+\\.(t|j)s$": "ts-jest"
    },
    "collectCoverageFrom": [
      "**/*.(t|j)s"
    ],
    "coverageDirectory": "../coverage",
    "testEnvironment": "node"
  }
}

nest-cli.json #

{
  "$schema": "https://json.schemastore.org/nest-cli",
  "collection": "@nestjs/schematics",
  "sourceRoot": "src",
  "compilerOptions": {
    "deleteOutDir": true,
    "assets": [
      { "include": "i18n/**/*", "watchAssets": true }
    ]
  }
}

app.module.ts #

我知道这段代码和当前文档略有不同，但它来自负责人的项目

import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import {
  AcceptLanguageResolver,
  CookieResolver,
  HeaderResolver,
  I18nJsonLoader,
  I18nModule,
  QueryResolver,
} from 'nestjs-i18n';
import * as path from 'path';

import { AppController } from './app.controller';
import { AppService } from './app.service';
import { PointsModule } from './points/points.module';
import { SlackModule } from './slack/slack.module';
import { UsersModule } from './users/users.module';

@Module({
  imports: [PointsModule, MongooseModule.forRoot('mongodb+srv://sharbelabousabha:2639Xq0y3W9ATVeO@cluster0.horwrkd.mongodb.net/?retryWrites=true&w=majority'), SlackModule, UsersModule,
    I18nModule.forRoot({
      fallbackLanguage: 'en',
      loaderOptions: {
        path: path.join(__dirname, '/i18n/'),
        watch: true,
      },
      resolvers: [

        // eslint-disable-next-line sort-keys

        { use: QueryResolver, options: ['lang', 'locale', 'l'] },

        new HeaderResolver(['x-custom-lang']),

        AcceptLanguageResolver,

        new CookieResolver(['lang', 'locale', 'l']),

      ],
    })

  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule { }

app.service.ts #

import { Injectable } from '@nestjs/common';
import { I18nContext, I18nService } from 'nestjs-i18n';

@Injectable()
export class AppService {
  constructor(private readonly i18n: I18nService) {}
  getHello(): string {
    console.log({ lang:   I18nContext.current().lang })
    return this.i18n.translate('Created.Success');
  }
}

内容的提问来源于stack exchange，提问作者Mohamed Chokor