Typescript implementation

[majo44]

This is PR which contains refactoring to typescript which:

• fallow patterns from redux-observable, so epic on input is consuming stream of events, and stream of state,
• where on state stream we have access to current state by .value property, and stream is filtered only to changed values of state (implementation taken directly from redux-observable)
• is strict static typed on the events, payload and state objects/streams
• exposing toEventObservable which can be used for simple creation of stream of events
• exposing toStateObservable which can be used for simple creation of stream of state
• exposing toEvent which should be used on return from epic
• exposing ofEvent which only filter for known events, or even restrict epic to handle just subset of known events (input events)

Todo:

• [x] implementation
• [x] build of es5/commonjs
• [x] build of es5/es6 module
• [x] linting
• [x] running jest tests
• [x] update readme
• [x] tsdoc
• [x] test coverage
• [x] size limit (looking for the places where we can optimize code)

[majo44]

Travis build is failed, and I'm not sure why, locally everything works fine, only difference is that I have newer yarn. :(

Update: yarn version is not a reason :(, looking for reason

[distolma]

@majo44 Travis-CI build fails because of size-limit tries to check index.js file, which doesn't exist before a build.

[majo44]

@distolma thx, I missed that, so I will move the size-limit to build

[distolma]

Great job!