What is Linting in Angular ?

Type ng lint

C:\Windows\System32\AngularDemo>ng lint
Linting "AngularDemo"...


All files pass linting.
Linting "AngularDemo-e2e"...


All files pass linting.

-------------------------------------------------------------------------------------------------------------------------
See the above. When we type ng lint it will check all type of errors in the current project. If it found any errors then it will immediately report.

linting is the tool that checks TypeScript code for programmatic and stylistic errors as well as non-adherence to coding standards and conventions. tslint.json is the configuration file for linting. This file contains all the default rules for linting.

linting rules:

• quotemark rule specifies whether you want single or double quotes
• no-trailing-whitespace rule disallows trailing whitespace at the end of a line
• semicolon rule specifies that a line should be terminated with a semicolon
• comment-format rule specifies that all single-line comments must begin with space
• component-class-suffix rule enforces that a component class should end with the suffix Component
• use-life-cycle-interface rule enforces that you add the implements keyword for every lifecycle hook you use

Some of the linting errors support automatic fix. To have these linting errors fixed automatically, run ng lint command with the --fix option.
ng lint --fix

To install the linting extension in Visual studio code:

1. Click on the "View" menu in "Visual Studi Code" and select "Extensions" from the context menu
2. In the "Search Extensions in Marketplace" textbox type TSLint
3. Click the "install" button
4. Once installed, restart Visual Studio Code to activate TSLint

To disable linting in VS code:

1. Click on the "View" menu in "Visual Studi Code" and select "Extensions" from the context menu
2. In the "EXTENSIONS" window, expand "INSTALLED" section
3. Click the "SETTINGS" icon against TSLint extension
4. Select "Disable (Always)" option

--------------------------------------------------------------------------------------------------------------------------

Different option for lint

To see the options that can be used with ng lint command, use
ng lint --help

Runs linting tools on Angular app code in a given project folder.
usage: ng lint <project> [options]

arguments:
  project
    The name of the project to lint.

options:
  --configuration (-c)
    Specify the configuration to use.

  --exclude
    Files to exclude from linting.

  --files
    Files to include in linting.

  --fix
    Fixes linting errors (may overwrite linted files).

  --force
    Succeeds even if there were linting errors.

  --format
    Output format (prose, json, stylish, verbose, pmd, msbuild, checkstyle, vso, fileslist).

  --help
    Shows a help message for this command in the console.

  --silent
    Show output text.

  --ts-config
    The name of the TypeScript configuration file.

  --tslint-config
    The name of the TSLint configuration file.

  --type-check
    Controls the type check for linting.