Through some investigation, found how to implement model types to services, would like

Inject type-safe models to services about bulletproof-nodejs HOT 4 CLOSED

santiq commented on July 21, 2024

Inject type-safe models to services

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Comments (4)

SamsadSajid commented on July 21, 2024 2

Hi...
So I was following this tutorial and trying to code along. But I got this error for this merged issue.

(node:26230) UnhandledPromiseRejectionWarning: TSError: ⨯ Unable to compile TypeScript:
src/services/authService.ts(12,46): error TS2503: Cannot find namespace 'Models'.

    at createTSError (/tut/node/node_modules/ts-node/src/index.ts:261:12)
    at getOutput (/tut/node/node_modules/ts-node/src/index.ts:367:40)
    at Object.compile (/tut/node/node_modules/ts-node/src/index.ts:558:11)
    at Module.m._compile (/tut/node/node_modules/ts-node/src/index.ts:439:43)
    at Module._extensions..js (internal/modules/cjs/loader.js:995:10)
    at Object.require.extensions.<computed> [as .ts] (/tut/node/node_modules/ts-node/src/index.ts:442:12)
    at Module.load (internal/modules/cjs/loader.js:815:32)
    at Function.Module._load (internal/modules/cjs/loader.js:727:14)
    at Module.require (internal/modules/cjs/loader.js:852:19)
    at require (internal/modules/cjs/helpers.js:74:18)
(node:26230) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:26230) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I checked the tsconfig.json and package.json in my project and in this project. They're basically just the same thing.

Do I need to import something or use any specific version of anything?

tsconfig.json

{
  "compilerOptions": {
    "target": "es2017",
    "lib": [
      "es2017",
      "esnext.asynciterable"
    ],
    "typeRoots": [
      "./node_modules/@types",
      "./src/types"
    ],
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "forceConsistentCasingInFileNames": true,
    "moduleResolution": "node",
    "module": "commonjs",
    "pretty": true,
    "sourceMap": true,
    "outDir": "./build",
    "allowJs": true,
    "noEmit": false,
    "esModuleInterop": true
  },
  "include": [
    "./src/**/*"
  ],
  "exclude": [
    "node_modules",
    "tests"
  ]
}

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bodn commented on July 21, 2024 1

I went ahead and renamed the /types/express to /types/global and that fixed my issue
https://www.typescriptlang.org/docs/handbook/declaration-files/templates/global-modifying-module-d-ts.html

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santiq commented on July 21, 2024

Sure, go ahead.
How would it be?

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JoseRFelix commented on July 21, 2024

First, define a Models global type namespace with the desired model definition:

src/types/express/index.d.ts

//...
namespace Models {
    export type UserModel = Model<IUser & Document>;
  }

Then on services constructor we can just call Models with the model to apply:

src/services/auth.ts

constructor(
    @Inject('userModel') private userModel: Models.UserModel,
    private mailer: MailerService,
    @Inject('logger') private logger,
  ) {}

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Inject type-safe models to services about bulletproof-nodejs HOT 4 CLOSED

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