How to properly import and use the MSAL (Microsoft Authentication Library for js) into a typescript react single page application?

It looks like the latest version of MSAL.js does have a CommonJS export. You can now just do the following in TypeScript (tested with version 2.3.3 of TypeScript and 0.1.3 of MSAL.js):

import * as Msal from 'msal';

Now in your .ts (or in my case .tsx file) you can, for instance, setup a click event handler and create a UserAgentApplication object:

// In you class somewhere
private userAgentApplication: any = undefined;

// The login button click handler
handleLoginClick = (event: any): void => {
    if (!this.userAgentApplication) {
        this.userAgentApplication = new Msal.UserAgentApplication(
            'clientID string', 'authority string or empty', this.authCallback, { cacheLocation: 'localStorage'});
    }
    // Other login stuff...
}

// In React render()
public render() {
    return (
        <Button
            bsStyle="warning"
            type="button"
            onClick={(e) => this.handleLoginClick(e)}
        >
        Log in
        </Button>
    );
}

As you have correctly mentioned - in the msal.d.ts there are no exports - its not a module, and therefore you should not try importing.

Instead you can use it like this:

/// <reference path="./node_modules/msal/out/msal.d.ts" />

const userAgentApplication = new Msal.UserAgentApplication("your_client_id", null, (errorDes, token, error, tokenType) =>
    {

    });

Note that even in readme they specify only one way of using their library - by including script tag, not by importing module. And further looking into their source code shows they are not using modules as well.

I had the same issue and couldn't wait for the author to fix it, so forked and modified the original code. Just as a temporary fix you can use my version msalx instead of msal.

npm install msalx

You can find the source code and an example usage in react at: https://github.com/malekpour/microsoft-authentication-library-for-js#example