Use less @plugin

[zombieJ]

试验了一下，使用 less-loader 的 preload plugins 可以正常解析，但是会导致 es/lib 调用也需要配置 preload plugin，太麻烦。还是先用空 less 文件来让它正常解析算了。

compile dist bisheng 都过了，准备开始研究配置主题，代码可以先过一遍。

ref: #13242

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[codecov]

Codecov Report

Merging #13595 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13595      +/-   ##
==========================================
+ Coverage   93.63%   93.68%   +0.04%     
==========================================
  Files         314      314              
  Lines        6631     6631              
  Branches     1767     1767              
==========================================
+ Hits         6209     6212       +3     
+ Misses        410      407       -3     
  Partials       12       12

Impacted Files	Coverage Δ
components/steps/index.tsx	100% <0%> (ø)	⬆️
components/_util/wave.tsx	87.87% <0%> (+3.03%)	⬆️

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[codecov]

Codecov Report

Merging #13595 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #13595   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files         314      314           
  Lines        6631     6631           
  Branches     1767     1736   -31     
=======================================
  Hits         6212     6212           
  Misses        407      407           
  Partials       12       12

Impacted Files	Coverage Δ
components/steps/index.tsx	100% <0%> (ø)	⬆️

---

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Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[afc163]

是不是可以精简一下我们用到的功能。

[afc163]

如果精简不了，干脆直接走 npm 依赖。

[afc163]

This pull request introduces 5 alerts when merging 2546a30 into 05cf557 - view on LGTM.com

new alerts:

• 5 for Unused variable, import, function or class

---

Comment posted by LGTM.com

[afc163]

This pull request introduces 6 alerts when merging c5462e4 into 05cf557 - view on LGTM.com

new alerts:

• 6 for Unused variable, import, function or class

---

Comment posted by LGTM.com

[afc163]

This pull request introduces 3 alerts when merging 2d5d71b into 05cf557 - view on LGTM.com

new alerts:

• 3 for Unused variable, import, function or class

---

Comment posted by LGTM.com

[chenshuai2144]

剩下的交给我吧

我做一个新的插件

[afc163]

master？

[afc163]

还是发到 feature 吧

[zombieJ]

这个变更对打包产物没有影响。

@chenshuai2144 ，先把换主题功能下了？

[afc163]

javascriptEnable 不用开了，可以吹一波，还是放到 feature 大版本来发。

然后文档里涉及 javascriptEnable 的也要改一波。

[afc163]

这个代码尚未提交到 feature