Download and install Node.js

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Open Terminal or Command Prompt and check node version using command node -v

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Now, type in npm install -g @angular/cli to install CLI

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Check CLI version using ng --version

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Create Angular workspace using ng new <app_name>

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app_name consider as libraryApp

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To create library init, use ng g library <library_name>

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library_name consider as myLib

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Inside the projects folder, go to mylib component inside myLib library.

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Design reusable component in it.

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Now, build that library using ng build <library_name>

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Library gets generated in dist folder

Using this library in same application.

Import myLib module in app.module.ts of application

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Access components or services of myLib library inside application and use wherever required in application

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Now, do ng serve to check the application

Using in external application

ng new externalApp - Create new external application

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In the ng build myLib log, dist folder locations are shown

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take lib path and do npm i <path> inside new external application

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Import myLib module in app.module.ts of application

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Access components or services of myLib library inside application and use wherever required in application

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Now, do ng serve to check the application