A step-by-step guide on how to access the version number in an Angular (v4+) application from the package

Question

A step-by-step guide on how to access the version number in an Angular (v4+) application from the package

Currently, I am attempting to retrieve the version number of my Angular application from package.json where it is stored. Most resources recommend using require to load the JSON file like so:

var pckg = require('../../package.json');
console.log(pckg.version);

However, when I place this code in the constructor of a component, I receive undefined as the output.

I then tried placing the require statement above the component by the imports in the following manner:

const { version: appVersion } = require('../../package.json')

export class StackOverflowComponent {
  public appVersion

  constructor() {
    this.appVersion = appVersion
  }
}

This resulted in an error message: Error: (SystemJS) Unexpected token : indicating an issue with parsing the JSON file during the require execution. Upon inspecting require, I noticed that it is identified as "NodeRequire(id: string)". Could this be different from requirejs?

It's important to note that I am utilizing systemjs and although many solutions reference Webpack, I have included relevant files that might aid in resolving my query.

tsconfig.json:

{
  "compilerOptions": {
   "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": ["es2015", "dom"],
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true,
    "allowSyntheticDefaultImports": true,
    "typeRoots": [
      "./node_modules/@types/"
    ]
  },
  "compileOnSave": true,
   "exclude": [
    "node_modules/*",
    "**/*-aot.ts"
  ]
}

devDependencies in package.json:

"devDependencies": {
    "@types/node": "^6.0.46",
    "concurrently": "^3.0.0",
    "lite-server": "^2.3.0",
    "rollup": "^0.50.0",
    "rollup-plugin-commonjs": "^8.2.1",
    "rollup-plugin-node-resolve": "^3.0.0",
    "rollup-plugin-uglify": "^2.0.1",
    "source-map-explorer": "^1.5.0",
    "typescript": "~2.3.2"
  },

json angular typescript systemjs

Answer 1

Answer №1

If you're running into issues with SystemJS trying to interpret a JSON file as executable code, the solution lies in utilizing a JSON loader such as the systemjs-plugin-json.

To make this work within your SystemJS setup, you'll need to update your configuration. Here's an example:

SystemJS.config({
  paths: {
    "npm:": "/node_modules/",
  },
  map: {
    json: "npm:systemjs-plugin-json",
  },
  packageConfigPaths: [
    "npm:*/package.json",
  ],
});

Once configured, instead of directly including the JSON file using a require call like

require('../../package.json!json');

, consider specifying the loader in the meta section:

SystemJS.config({
  meta: {
    "path/to/package.json": {
      loader: "json",
    },
  },
});

Determine the correct path for path/to/package.json based on the rest of your SystemJS setup, particularly the baseUrl.

Answer 2

If you're running into issues with SystemJS trying to interpret a JSON file as executable code, the solution lies in utilizing a JSON loader such as the systemjs-plugin-json.

To make this work within your SystemJS setup, you'll need to update your configuration. Here's an example:

SystemJS.config({
  paths: {
    "npm:": "/node_modules/",
  },
  map: {
    json: "npm:systemjs-plugin-json",
  },
  packageConfigPaths: [
    "npm:*/package.json",
  ],
});

Once configured, instead of directly including the JSON file using a require call like

require('../../package.json!json');

, consider specifying the loader in the meta section:

SystemJS.config({
  meta: {
    "path/to/package.json": {
      loader: "json",
    },
  },
});

Determine the correct path for path/to/package.json based on the rest of your SystemJS setup, particularly the baseUrl.

Answer 3

Answer №2

To enable importing JSON files in TypeScript, you can add the following declaration to your typings.d.ts file:

declare module '*.json' {
  const value: any;
  export default value;
}

Once this is done, you can import a JSON file like so:

import * as data from '../path-to-root/data.json';

You can then access the data within the JSON file in your component's constructor:

console.log(`value: ${data['value']}`);

Alternatively, you can access the data like this:

console.log(`value: ${(data as any).value}`);

Answer 4

To enable importing JSON files in TypeScript, you can add the following declaration to your typings.d.ts file:

declare module '*.json' {
  const value: any;
  export default value;
}

Once this is done, you can import a JSON file like so:

import * as data from '../path-to-root/data.json';

You can then access the data within the JSON file in your component's constructor:

console.log(`value: ${data['value']}`);

Alternatively, you can access the data like this:

console.log(`value: ${(data as any).value}`);

A step-by-step guide on how to access the version number in an Angular (v4+) application from the package

Answer №1

Answer №2

Similar questions

The final value of a loop is consistently returned each time

Converting a JSON array into a single concatenated string

Execute the render function of the components that have been passed as

An AngularJS Dilemma: Troubleshooting JSON Integration

Utilizing the power of JDBC in conjunction with Elasticsearch and the Json data type in Post

Understanding the Google speech kit response on iOS involves parsing the data effectively

Is it possible to dynamically update JSON files in AngularJS?

What is the best way to swap out one component for another in a design?

Tips for transforming a JSON Array of Objects into an Observable Array within an Angular framework

Parsing a list using GSON

What is a way to conceal an Angular Material FormGroup on the webpage until the data has been retrieved from the background?

Two errors encountered in failing Jest test

What is the preferred build tool to use with Deno?

When setupFilesAfterEnv is added, mock functions may not function properly in .test files

How is it possible that this is not causing a syntax or compile-time error?

Tips for transmitting data from Dart to Typescript Cloud functions, encountering the UNAUTHENTICATED error code

What is the method for sorting flowfiles by their contained data?

Utilize async/await to send images using node mailer

Using Jquery to Parse Json data from Twitter

Storing unprocessed JSON data as a string within the database