downgrade less to ^2.7.3

package.json

@@ -7,6 +7,9 @@
     "site:start": "node site_scripts/generate-site init && node site_scripts/generateColorLess && ng serve --port 0 --open",
     "site:init": "node site_scripts/generate-site init && node site_scripts/generateColorLess",
     "site": "node site_scripts/generate-site",
+    "schematic:demo": "node schematics_script/demo2schematics",
+    "schematic:tsc": "tsc -p schematics/tsconfig.json",
+    "schematic:build": "npm run schematic:tsc && node schematics_script/copy-resources",
     "ng": "ng",
     "start": "ng serve -p 0",
     "build": "node site_scripts/generate-site init && ng build",
@@ -25,6 +28,7 @@
   "module": "./esm5/antd.js",
   "es2015": "./esm2015/antd.js",
   "typings": "./antd.d.ts",
+  "schematics": "./schematics/collection.json",
   "keywords": [
     "ant",
     "design",
@@ -61,6 +65,9 @@
     "zone.js": "^0.8.26",
     "@angular/compiler-cli": "^6.0.0",
     "@angular-devkit/build-angular": "~0.6.0",
+    "@angular-devkit/core": "^0.6.0",
+    "@angular-devkit/schematics": "^0.6.0",
+    "@schematics/angular": "^0.6.0",
     "typescript": "~2.7.2",
     "@angular/cli": "~6.0.0",
     "@angular/language-service": "^6.0.0",
@@ -96,7 +103,9 @@
     "@stackblitz/sdk": "^1.1.1",
     "codecov": "^3.0.0",
     "ngx-infinite-scroll": "^6.0.0",
-    "less-plugin-clean-css": "^1.5.1"
+    "less-plugin-clean-css": "^1.5.1",
+    "fs-extra": "^6.0.1",
+    "parse5": "^4.0.0"
   },
   "peerDependencies": {
     "@angular/animations": "^6.0.0",

schematics/ng-add/index.ts

@@ -13,6 +13,7 @@ import { Schema } from './schema';
 export default function (options: Schema): Rule {
   return chain([
     options && options.skipPackageJson ? noop() : addZorroToPackageJson(),
+    downgradeLess(),
     addThemeToAppStyles(options),
     addModulesToAppModule(options),
     addI18n(options)
@@ -59,6 +60,13 @@ function addI18n(options: Schema) {
   };
 }
 
+function downgradeLess() {
+  return (host: Tree) => {
+    addPackageToPackageJson(host, 'dependencies', 'less', '^2.7.3');
+    return host;
+  };
+}
+
 /** Add NG-ZORRO, annimations to package.json if not already present. */
 function addZorroToPackageJson() {
   return (host: Tree) => {