fix(icon): ensure icon data is valid

[BeADre]

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[中文版模板 / Chinese template]

This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

fix #2745

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• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[haoziqaq]

I have encountered this problem too, and I hope to merge quickly

[gaokun]

@tangjinzhou
This PR put a warning on the table on Webpack5 (webpack4 is ok).

According to the code, webpack5 assumes we want to use allIcons.default, but default doesn't export by allIcons.

Plz help to check.

// Initial setting

// https://github.com/vueComponent/ant-design-vue/issues/2745
let validIcons = allIcons.default || allIcons;

VueIcon.add(...Object.keys(validIcons).map(key => validIcons[key]));

[gaweki]

yes @tangjinzhou , version ^1.7.7 warn

 WARNING  Compiled with 1 warning                                                                                                                                                          4:15:53 PM

 warning  in ./node_modules/ant-design-vue/es/icon/index.js

"export 'default' (imported as 'allIcons') was not found in '@ant-design/icons/lib/dist'


  App running at:
  - Local:   http://localhost:8001/ 

[zkwolf]

yes @tangjinzhou , version ^1.7.7 warn

 WARNING  Compiled with 1 warning                                                                                                                                                          4:15:53 PM

 warning  in ./node_modules/ant-design-vue/es/icon/index.js

"export 'default' (imported as 'allIcons') was not found in '@ant-design/icons/lib/dist'


  App running at:
  - Local:   http://localhost:8001/ 

单独开个issue吧

[github-actions]

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