fix(v2): use fswatch instead of timeout polling to wait for client manifest

[endiliey]

Motivation

Optimize implementation of WaitPlugin. It is better to use fs event system to wait for a file rather than using hacky polling timeout implementation with a timeout. Also, no need to wait for chunk-map.json because it is 100% guaranteed that client-manifest.json will be generated after chunk-map.json in client. So if manifest exist, chunk map will exist.

This is an attempt to fix error due to timeout like below

> docs@ build ROOT/uniforms-2/website
> docusaurus build

Creating an optimized production build...

Compiling

● Client █████████████████████████ chunk asset optimization (92%) TerserPlugin 
 

● Server █████████████████████████ building (70%) 107/107 modules 0 active
 

ROOT/uniforms-2/website/node_modules/@docusaurus/core/lib/webpack/plugins/WaitPlugin.js:34
          throw Error("Maybe it just wasn't meant to be.");
          ^

Error: Maybe it just wasn't meant to be.
    at Timeout.poll [as _onTimeout] (ROOT/uniforms-2/website/node_modules/@docusaurus/core/lib/webpack/plugins/WaitPlugin.js:34:17)
    at listOnTimeout (timers.js:327:15)
    at processTimers (timers.js:271:5)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! docs@ build: `docusaurus build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the docs@ build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     HOME/.npm/_logs/2019-04-24T07_07_05_219Z-debug.log

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Production build still works

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It seems that the netlify fails due to netlify problem

People ranting on twitter