Typescript errors

[DavidLevayer]

Typescript errors

[mseemann]

can you also post your package.json?

[DavidLevayer]

Here it is:

{
"dependencies": {
    "@angular/common": "^2.3.1",
    "@angular/compiler": "^2.3.1",
    "@angular/core": "^2.3.1",
    "@angular/forms": "^2.3.1",
    "@angular/http": "^2.3.1",
    "@angular/platform-browser": "^2.3.1",
    "@angular/platform-browser-dynamic": "^2.3.1",
    "@angular/router": "^3.3.1",
    "body-parser": "^1.15.2",
    "core-js": "^2.4.1",
    "express": "^4.14.0",
    "js-restful-express": "^2.0.0",
    "rxjs": "^5.0.1",
    "ts-helpers": "^1.1.1",
    "zone.js": "^0.7.2"
  },
  "devDependencies": {
    "@angular/compiler-cli": "^2.3.1",
    "@types/body-parser": "0.0.33",
    "@types/chai": "^3.4.34",
    "@types/chai-http": "0.0.29",
    "@types/core-js": "^0.9.35",
    "@types/express": "^4.0.34",
    "@types/jasmine": "2.5.38",
    "@types/mocha": "^2.2.35",
    "@types/node": "^6.0.42",
    "angular-cli": "1.0.0-beta.24",
    "chai": "^3.5.0",
    "chai-http": "^3.0.0",
    "codelyzer": "~2.0.0-beta.1",
    "concurrently": "^3.1.0",
    "jasmine-core": "2.5.2",
    "jasmine-spec-reporter": "2.5.0",
    "karma": "1.2.0",
    "karma-cli": "^1.0.1",
    "karma-jasmine": "^1.0.2",
    "karma-phantomjs-launcher": "^1.0.2",
    "karma-remap-istanbul": "^0.2.1",
    "mocha": "^3.2.0",
    "protractor": "~4.0.13",
    "ts-node": "^1.2.1",
    "tslint": "^4.0.2",
    "typescript": "~2.0.3"
  }
}

[mseemann]

core-js is fine. it provides a reflect implementation. "Make sure you have a shim for es7 reflect" just means I don't want to require a specific reflect implementation.

here is a tsconfig that works for me if I install "@types/reflect-metadata" to get the required typings. core-js wasn't sufficient.

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "lib": ["es6", "es2015", "dom"],
    "sourceMap": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false,
    "declaration": true,
    "typeRoots": [
      "node_modules/@types"
    ],
    "types": [
      "node",
      "reflect-metadata"
    ]
  }
}

[DavidLevayer]

Hello there! An error leading to another, I've finnaly manage to get a stable app using your library. Here is what I've added:

tsconfig:

{
  "compilerOptions": {
    "experimentalDecorators": true,
    "types": [ ],
    "target": "es5" <-- added this
  }
}

In my ping.router.ts:

import 'reflect-metadata'; // first install it using npm

Without this import, I have to deal with the following error:
ReferenceError: Reflect is not defined
With this import, it seems that I don't need to use types and typeRoots in tsconfig... So I removed them (include types does not prevent the error above anyway).

Lastly, I need to install (but not import... 😕 ) the @types/winston dependency to prevent error TS2307: Cannot find module 'winston'

Two main concerns with this solution:

• Why do I need to install @types/winston when I don't even use winston myself?
• Why do I need to import reflect-metadata each time I want to use a decorator? I've tried to import it in index.ts (my main server file) but tsc throws an Reflect not definederror.

Thanks a lot for your help!

[mseemann]

Why do I need to install @types/winston when I don't even use winston myself?

Because this package includes all sources and it's own tsconfig.json.

Why do I need to import reflect-metadata each time I want to use a decorator? I've tried to import it in index.ts (my main server file) but tsc throws an Reflect not definederror

you need to make sure that reflect-metadata is included once. And you need to tell typescript about the type @types/reflect-metadata.