prettier-plugin-angular

prettier-plugin-angular

A Prettier plugin for Angular HTML templates that formats, aligns, and sorts element attributes.

What it does

Attribute alignment

Attributes are formatted using the minimum number of lines needed:

• Single line — if everything fits within printWidth:

  <input type="text" [value]="v" />
  

• Aligned — first attribute inline with the tag, rest aligned to the same column:

  <p-select [options]="companiesForSelector()"
            [attr.aria-invalid]="form.controls.companyId.invalid"
            id="companyId"
            class="w-full"
            filter
            showClear />
  

• Fallback — if the tag itself is too long to inline the first attribute, each attribute on its own line indented by tabWidth:

  <my-very-long-component-name
    [options]="items"
    (change)="onChange($event)"
    class="w-full" />
  

Attribute sorting

Attributes are sorted by category in this order:

Category	Examples
ref	#myRef
structural	*ngIf, *ngFor
twoWay	[(ngModel)]
input	[value], [disabled], [attr.aria-label]
output	(click), (ngModelChange)
animation	[@fadeIn]
static	id="x", class="foo", formControlName="x"
boolean	disabled, required, showIcon

Multi-line attribute values preserved

Developer-written multi-line values (e.g. ternary expressions) are preserved and re-indented to match the attribute's column:

<p-select [options]="items"
          [attr.aria-describedby]="
            form.controls.companyId.invalid && form.controls.companyId.touched
              ? 'companyId-error'
              : null
          "
          id="companyId" />

Angular control flow formatted

Elements inside @if, @for, @switch, @defer and other Angular control flow blocks are fully formatted — not emitted verbatim:

@if (form.controls.companyId.invalid && form.controls.companyId.touched) {
  <small id="companyId-error" class="p-error block mt-1" role="alert">
    {{ 'validation.required' | translate }}
  </small>
}

Install

npm install -D prettier-plugin-angular

Configure

In .prettierrc:

{
  "plugins": ["prettier-plugin-angular"],
  "overrides": [
    {
      "files": "*.html",
      "options": {
        "parser": "angular-attributes",
        "angularAttributeSort": true
      }
    }
  ]
}

Options

Option	Type	Default	Description
angularAttributeSort	boolean	true	Sort attributes by category
angularAttributeOrder	string[]	["ref","structural","twoWay","input","output","animation","static","boolean"]	Category order (any subset, in your preferred order)

Full example

Input:

<p-select class="w-full" (change)="onChange($event)" [options]="items" inputId="x" #sel showIcon />

Output:

<p-select [options]="items"
          (change)="onChange($event)"
          inputId="x"
          class="w-full"
          #sel
          showIcon />