should interface AuthProviderCallback accept null on accessToken?

[sibelius]

msgraph-sdk-javascript/src/common.ts

Lines 12 to 14 in 0f9ebec

	export interface AuthProviderCallback {
	(error: any, accessToken: string): void
	}

it makes sense when we got an error to get an access token

[muthurathinam]

@sibelius Yeah this does make sense, and thanks for bringing this to light.
Will make the change. If you have done it first, submit a pull request. Am happy to review !

883186

[muthurathinam]

Fixed in this release https://github.com/microsoftgraph/msgraph-sdk-javascript/releases/tag/1.4.0