feat: rewrite react-vega in typescript

[kristw]

💔 BREAKING CHANGE:

• Rewrite the project in typescript.
• Changes API of react-vega to mimic vega-embed. The new <Vega /> component actually supports both vega and vega-lite.

import { Vega } from 'react-vega';

<Vega 
  // class and style of the container div element
  className
  style
  // pass data
  data
  // handle signals
  signalHandlers
  // These props are from vega-embed. See https://github.com/vega/vega-embed
  mode
  theme
  defaultStyle
  renderer
  logLovel
  tooltip
  loader
  patch
  width
  height
  padding
  actions
  scaleFactor
  config
  editorUrl
  sourceHeader
  sourceFooter
  hover
  i18n
  downloadFileName
/>

• Since the new <Vega /> already support vega-lite. I am deprecating react-vega-lite and add lightweight convenient component VegaLite to react-vega instead.

Internal

• Update storybook config to support typescript.
• Enable travis CI.

Fixes: #46, #47, #25, #23, #53

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@005d5d4). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #54   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?      1           
  Lines             ?      2           
  Branches          ?      1           
=======================================
  Hits              ?      2           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
packages/react-vega/src/utils/isFunction.ts	100% <100%> (ø)

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[domoritz]

Thank you ❤️ !

[domoritz]

Should we use npm deprecate to tell people not to use the react-vega-lite package?

[kristw]

@domoritz I haven't published react-vega@7 yet. Thinking about publishing a prerelease version first.

I still have to update docs and add a few more things for perf, but at the least the storybook is working. Perhaps after official 7.0.0 is release can do npm deprecate at that point.