How to use codelyzer in angular 2

Question

I want to use codelyzer in my project and i use the systemjs and no webpack. I added a this tslint to my project and use npm start to run the project but it's didn't get any error from my project even though i didn't use correct style guide in my project what should I do to use codelyzer?

Answer 1

Codelyzer is already available online at http://codelyzer.com so you can give it a try in your browser!

You can also use it in:

Angular CLI

Angular CLI has support for codelyzer. In order to validate your code with CLI and the custom Angular specific rules just use:

ng new codelyzer
ng lint

Note that by default all components are aligned with the style guide so you won't see any errors in the console.

Angular Seed

Another project which has out of the box integration with codelyzer is angular-seed. In order to run the linter you should:

# Skip if you've already cloned Angular Seed
git clone https://github.com/mgechev/angular-seed

# Skip if you've already installed all the dependencies of Angular Seed
cd angular-seed && npm i

# Run all the tslint and codelyzer rules
npm run lint

Note that by default all components are aligned with the style guide so you won't see any errors in the console.

Custom Setup

You can easily use codelyzer with your custom setup:

Installation

npm i codelyzer tslint typescript @angular/[email protected] @angular/[email protected] [email protected] [email protected]

Now create the following tslint.json file where your node_modules directory is:

{
  "rulesDirectory": [
    "node_modules/codelyzer"
  ],
  "rules":{
    "directive-selector-name": [true, "camelCase"],
    "component-selector-name": [true, "kebab-case"],
    "directive-selector-type": [true, "attribute"],
    "component-selector-type": [true, "element"],
    "directive-selector-prefix": [true, "sg"],
    "component-selector-prefix": [true, "sg"],
    "use-input-property-decorator": true,
    "use-output-property-decorator": true,
    "use-host-property-decorator": true,
    "no-attribute-parameter-decorator": true,
    "no-input-rename": true,
    "no-output-rename": true,
    "no-forward-ref": true,
    "use-life-cycle-interface": true,
    "use-pipe-transform-interface": true,
    "pipe-naming": [true, "camelCase", "sg"],
    "component-class-suffix": true,
    "directive-class-suffix": true,
    "import-destructuring-spacing": true,
    "templates-use-public": true,
    "no-access-missing-member": true,
    "invoke-injectable": true
  }
}

Next you can create a component file in the same directory with name component.ts and the following content:

import { Component } from '@angular/core';

@Component({
  selector: 'codelyzer',
  template: `
    <h1>Hello {{ nme }}!</h1>
  `
})
class Codelyzer {
  name: string = 'World';

  ngOnInit() {
    console.log('Initialized');
  }
}

As last step you can execute all the rules against your code with tslint:

$ ./node_modules/.bin/tslint -c tslint.json component.ts

You should see the following output:

component.ts[4, 13]: The selector of the component "Codelyzer" should have prefix "sg"
component.ts[12, 3]: Implement lifecycle hook interface OnInit for method ngOnInit in class Codelyzer
component.ts[9, 7]: The name of the class Codelyzer should end with the suffix Component
component.ts[6, 18]: The property "nme" that you're trying to access does not exist in the class declaration. Probably you mean: "name".

Editor Configuration

Note that you need to have tslint plugin install on your editor.

Codelyzer should work out of the box with Atom but for VSCode you will have to open Code > Preferences > User Settings, and enter the following config:

{
  "tslint.rulesDirectory": "./node_modules/codelyzer",
  "typescript.tsdk": "node_modules/typescript/lib"
}

Now you should have the following result:

_{(source: gifyu.com)}