Add variable.less to support css variable (ant-design#31496)

* chore: use varaible.less

* chore: basic primary varaible

* chore: Move to variable

* chore: align active color

* chore: global fix of css variable

* chore: primary colors

* chore: button danger

* chore: btn default error color

* chore: button series

* chore: More examples

* chore: More components

* chore: Form demo

* chore: form style

* fix: Tag & Alert variable

* chore: update footer

* chore: rm tmp code

* chore: transfer

* fix: picker column active color

* chore: Adjust active bg color

* chore: table hover color

* chore: all css variables

* chore: Global using variables

* chore: Test case

* chore: Update test logic

* chore: back of default less

* chore: entry of site use proxy style

* chore: update entry

* chore: split of variables

* refactor: quick dist speed

* fix: site use variable version

* chore: Update less config

* chore: add mv script

* chore: Update repalcement script

* chore: Add inject variables

* chore: Update script

* fix: script path

* chore: Move to component instead

* chore: fix condition

* chore: update config

* chore: Update in less transform

* chore: Modify logic

* chore: change to variables

* chore: Update name

* fix: script name

* chore: do inject

* revert: back of path

* chore: 2 way of generate

* bump tools

* chore: Add auto replacement script

* chore: auto genrate less file

* chore: fix test

* test: More test case

* chore: Update limit config

* test: coverage

* docs: Update doc

Author: zombieJ

Diff for: .antd-tools.config.js

@@ -90,6 +90,7 @@ function finalizeDist() {
     buildThemeFile('default', defaultVars);
     buildThemeFile('dark', darkVars);
     buildThemeFile('compact', compactVars);
+    buildThemeFile('variable', {});
     fs.writeFileSync(
       path.join(process.cwd(), 'dist', `theme.js`),
       `
@@ -125,8 +126,56 @@ module.exports = {
   }
 }
 
+function isComponentStyle(file) {
+  return file.path.match(/style(\/|\\)index\.tsx/);
+}
+
+function needTransformStyle(content) {
+  return content.includes('./index.less');
+}
+
 module.exports = {
   compile: {
+    transformTSFile(file) {
+      if (isComponentStyle(file)) {
+        let content = file.contents.toString();
+
+        if (needTransformStyle(content)) {
+          const cloneFile = file.clone();
+
+          // Origin
+          content = content.replace('./index.less', './index-default.less');
+          cloneFile.contents = Buffer.from(content);
+
+          return cloneFile;
+        }
+      }
+    },
+    transformFile(file) {
+      if (isComponentStyle(file)) {
+        const content = file.contents.toString();
+
+        if (needTransformStyle(content)) {
+          const cloneFile = file.clone();
+          cloneFile.contents = Buffer.from(
+            [
+              // Inject variable
+              '@root-entry-name: default',
+              // Point to origin file
+              "@import './index';",
+            ].join('\n\n'),
+          );
+          cloneFile.path = cloneFile.path.replace('index.tsx', 'index-default.less');
+          return cloneFile;
+        }
+      }
+      return [];
+    },
+    lessConfig: {
+      modifyVars: {
+        'root-entry-name': 'default',
+      },
+    },
     finalize: finalizeCompile,
   },
   dist: {

Diff for: components/affix/__tests__/Affix.test.tsx

@@ -206,11 +206,8 @@ describe('Affix Render', () => {
 
       // Mock trigger resize
       updateCalled.mockReset();
-      const resizeObserverInstance: ReactWrapper<
-        HTMLAttributes,
-        unknown,
-        ResizeObserverImpl
-      > = affixMounterWrapper.find('ResizeObserver') as any;
+      const resizeObserverInstance: ReactWrapper<HTMLAttributes, unknown, ResizeObserverImpl> =
+        affixMounterWrapper.find('ResizeObserver') as any;
       resizeObserverInstance
         .at(index)
         .instance()
@@ -225,7 +222,7 @@ describe('Affix Render', () => {
               contentBoxSize: [],
             },
           ],
-          ({} as unknown) as ResizeObserver,
+          {} as unknown as ResizeObserver,
         );
       await sleep(20);
 

Diff for: components/button/style/index.less

@@ -207,19 +207,19 @@
   }
 
   &-background-ghost&-primary {
-    .button-variant-ghost(@btn-primary-bg);
+    .button-variant-ghost(@btn-primary-bg, @btn-primary-bg, @primary-color-hover, @primary-color-active);
   }
 
   &-background-ghost&-danger {
-    .button-variant-ghost(@btn-danger-border);
+    .button-variant-ghost(@btn-danger-border, @btn-danger-border, @error-color-hover, @error-color-active);
   }
 
   &-background-ghost&-dangerous {
-    .button-variant-ghost(@btn-danger-border);
+    .button-variant-ghost(@btn-danger-border, @btn-danger-border, @error-color-hover, @error-color-active);
   }
 
   &-background-ghost&-dangerous&-link {
-    .button-variant-ghost(@btn-danger-border, transparent);
+    .button-variant-ghost(@btn-danger-border, transparent, @error-color-hover, @error-color-active);
   }
 
   &-two-chinese-chars::first-letter {