n9-codelyzer

Codelyzer

A set of tslint rules for static code analysis of Angular TypeScript projects.

You can run the static code analyzer over web apps, NativeScript, Ionic, etc.

How to use?

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/core@2.0.2 @angular/compiler@2.0.2 rxjs@5.0.0-beta.12 zone.js@0.6.21

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

{
  "rulesDirectory": [
    "node_modules/codelyzer"
  ],
  "rules":{
    "directive-selector": [true, "attribute", "sg", "camelCase"],
    "component-selector": [true, "element", "sg", "kebab-case"],
    "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" (https://goo.gl/cix8BY)
component.ts[12, 3]: Implement lifecycle hook interface OnInit for method ngOnInit in class Codelyzer (https://goo.gl/w1Nwk3)
component.ts[9, 7]: The name of the class Codelyzer should end with the suffix Component (https://goo.gl/5X1TE7)
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:

Enjoy!

Recommended configuration

Below you can find a recommended configuration which is based on the Angular 2 Style Guide.

{
  "directive-selector": [true, "attribute", "sg", "camelCase"],
  "component-selector": [true, "element", "sg", "kebab-case"],
  "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
}

License

MIT