Switch to a more modern TypeScript target

[marcodejongh]

Enhancement description

Currently target in tsconfig is set to "es5", as a result TypeScript outputs ES5 which includes generators for any async code. Generators are hell for debugging node. Also, ES5 at this point is only required for IE11 support and ancient ancient versions of node.js. For example node 8 already supports es2017: https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping#node-8.

Also by making this change the bundle size of the module should go down for users that bundle this module into the browser

The problem it solves

Better debugging + lower bundle size

Additional information

It probably wouldn't be a bad idea to also leave import/export statements in the code by setting "module" setting to ES2020. ES2020 is required to allow for dynamic imports, but once that is done 2 dists will have to be build one for browser & 1 for node consumers

[henningmu]

That makes a lot of sense, @marcodejongh. Would you be willing to create the PR with the proposed changes? :)