Error ts2314: generic type ‘ɵɵdirectivedeclaration’ requires 6 type argument(s).

Error TS2314: Generic type ‘ɵɵDirectiveDeclaration’ requires 6 type argument(s).

This error occurs in TypeScript when you are trying to declare or define a directive but haven’t provided all the necessary type arguments to the generic type ‘ɵɵDirectiveDeclaration’.

The generic type ‘ɵɵDirectiveDeclaration’ is used by the Angular compiler to generate code for directives. It requires six type arguments to properly define the directive’s type.

To fix this error, you need to provide all the required type arguments to the ‘ɵɵDirectiveDeclaration’ generic type.

Example:

Let’s say you have a custom directive called ‘MyDirective’ that takes an input parameter and implements OnInit lifecycle hook:

    import { Directive, Input, OnInit } from '@angular/core';

    @Directive({
      selector: '[myDirective]'
    })
    export class MyDirective implements OnInit {
      @Input() myInput: string;

      ngOnInit() {
        console.log('Directive initialized');
      }
    }
  

In this case, you have provided the necessary Angular directives and implemented the OnInit lifecycle hook. However, if you forget to specify the type arguments for ‘ɵɵDirectiveDeclaration’, you will encounter the TS2314 error.

To resolve the error, you need to provide the correct type arguments for ‘ɵɵDirectiveDeclaration’ in the directive’s factory function:

    import { ɵɵDirectiveDeclaration } from '@angular/core';
    import { MyDirective } from './my.directive';

    export function MyDirectiveDeclaration(): ɵɵDirectiveDeclaration<any, '[myDirective]', never, {myInput: string}, {}, never> {
      return {
        ngMetadataName: 'ɵɵDirectiveDeclaration',
        type: MyDirective,
        selectors: [['', 'myDirective', '']],
        inputs: { myInput: 'myInput' },
        features: [],
        outputs: {},
        exportAs: undefined
      };
    }
  

Here, we have added the correct type arguments for ‘ɵɵDirectiveDeclaration’ to match the directive’s properties and features. Now the error should be resolved.