Use finally on promise

By default, there is no Finally block for a Promise. To use a Finally block with your promise, you can use the Shim promise.prototype.finally.

1. Install * promise.prototype.finally *

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$ npm install --save promise.prototype.finally

2. Install the typing

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$ npm install --save-dev @types/promise.prototype.finally

3. Import the shim into your * app.module.ts * and initialize it.

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import { shim } from 'promise.prototype.finally';
shim();

4. You can now use the Finally block as follows.

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function().then(response => {

    // do something

  }).catch(error => {

    // do error handling

  }).finally(() => {

    // do it in every case

  }
);

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