botframework-streaming should publish ES5 code to NPM

[compulim]

Versions

master as of right now.

Describe the bug

botframework-streaming is not working in IE11.

Probably, it is related to tsconfig.json not emitting ES5 code.

https://github.com/microsoft/botbuilder-js/blob/master/libraries/botframework-streaming/tsconfig.json#L3

If non-ES5 is highly desirable for efficiency reason, please publish dual entrypoints to NPM, with browser pointing to ES5 code and main point to ES6+ code.

To Reproduce

Steps to reproduce the behavior:

1. Create a web project (e.g. Webpack)
2. Include botframework-streaming in the dependencies and the bundle
3. Open the web project in IE11

Expected behavior

botframework-streaming should work in IE11.

Instead, it throw syntax error when loading in IE11.

Screenshots

Additional context

[bug]

[stevengum]

@compulim can you confirm if the dependency chain below is correct?

botframework-streaming -> botframework-directlinejs -> botframework-webchat

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Edit: Confirmed with CK that this is the dependency tree.

[stevengum]

#1669 (comment)