error: Could not find a declaration file for module '@ckeditor/ckeditor5-build-classic' angular 9

I want to use ckeditor in angular 9, I followed instructions in https://ckeditor.com/docs/ckeditor5/latest/builds/guides/integration/frameworks/angular.html but it shows an error where I import '@ckeditor/ckeditor5-build-classic':

Could not find a declaration file for module '@ckeditor/ckeditor5-build-classic'. 

'a:/repositories/BasimStore/source/Web/Frontend/node_modules/@ckeditor/ckeditor5-build-classic/build/ckeditor.js' implicitly has an 'any' type.
  Try `npm install @types/ckeditor__ckeditor5-build-classic` if it exists or add a new declaration (.d.ts) file containing `declare module '@ckeditor/ckeditor5-build-classic';`

I have both "@ckeditor/ckeditor5-angular": "^1.2.3" and "@ckeditor/ckeditor5-build-classic": "^20.0.0" in package.json but still it shows the error. I could't find index.d.ts in ckeditor5-build-classic folder. How should I fix this error?

Add typings.d.ts file in your project root or any folder

add following code into the typing file

declare module '@ckeditor/ckeditor5-build-classic' {
    const ClassicEditorBuild: any;

    export = ClassicEditorBuild;
}

that's it angular will automatically detect typings and compile it as dependency this will solve the issue its also sugggested in official CKEDITOR page: https://ckeditor.com/docs/ckeditor5/latest/builds/guides/integration/frameworks/angular.html

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