drop gulp-cssnano, use gulp-postcss

build/lib/optimize.js

@@ -165,7 +165,8 @@ function minifyTask(src, sourceMapBaseUrl) {
     const esbuild = require('esbuild');
     const sourceMappingURL = sourceMapBaseUrl ? ((f) => `${sourceMapBaseUrl}/${f.relative}.map`) : undefined;
     return cb => {
-        const minifyCSS = require('gulp-cssnano');
+        const cssnano = require('cssnano');
+        const postcss = require('gulp-postcss');
         const sourcemaps = require('gulp-sourcemaps');
         const jsFilter = filter('**/*.js', { restore: true });
         const cssFilter = filter('**/*.css', { restore: true });
@@ -185,7 +186,7 @@ function minifyTask(src, sourceMapBaseUrl) {
                 f.sourceMap = JSON.parse(sourceMapFile.text);
                 cb(undefined, f);
             }, cb);
-        }), jsFilter.restore, cssFilter, minifyCSS({ reduceIdents: false }), cssFilter.restore, sourcemaps.mapSources((sourcePath) => {
+        }), jsFilter.restore, cssFilter, postcss([cssnano({ preset: 'default' })]), cssFilter.restore, sourcemaps.mapSources((sourcePath) => {
             if (sourcePath === 'bootstrap-fork.js') {
                 return 'bootstrap-fork.orig.js';
             }

build/lib/optimize.ts

@@ -236,7 +236,8 @@ export function minifyTask(src: string, sourceMapBaseUrl?: string): (cb: any) =>
 	const sourceMappingURL = sourceMapBaseUrl ? ((f: any) => `${sourceMapBaseUrl}/${f.relative}.map`) : undefined;
 
 	return cb => {
-		const minifyCSS = require('gulp-cssnano') as typeof import('gulp-cssnano');
+		const cssnano = require('cssnano') as typeof import('cssnano');
+		const postcss = require('gulp-postcss') as typeof import('gulp-postcss');
 		const sourcemaps = require('gulp-sourcemaps') as typeof import('gulp-sourcemaps');
 
 		const jsFilter = filter('**/*.js', { restore: true });
@@ -267,7 +268,7 @@ export function minifyTask(src: string, sourceMapBaseUrl?: string): (cb: any) =>
 			}),
 			jsFilter.restore,
 			cssFilter,
-			minifyCSS({ reduceIdents: false }),
+			postcss([cssnano({ preset: 'default' })]),
 			cssFilter.restore,
 			(<any>sourcemaps).mapSources((sourcePath: string) => {
 				if (sourcePath === 'bootstrap-fork.js') {

build/lib/typings/gulp-cssnano.d.ts

@@ -1,12 +0,0 @@
-
-declare module "gulp-cssnano" {
-	function f(opts:{reduceIdents:boolean;}): NodeJS.ReadWriteStream;
-
-	/**
-	 * This is required as per:
-	 * https://github.com/microsoft/TypeScript/issues/5073
-	 */
-	namespace f {}
-
-	export = f;
-}

package.json

@@ -98,8 +98,10 @@
     "@types/chokidar": "2.1.3",
     "@types/cookie": "^0.3.3",
     "@types/copy-webpack-plugin": "^6.0.3",
+    "@types/cssnano": "^4.0.0",
     "@types/debug": "4.1.5",
     "@types/graceful-fs": "4.1.2",
+    "@types/gulp-postcss": "^8.0.0",
     "@types/http-proxy-agent": "^2.0.1",
     "@types/keytar": "^4.4.0",
     "@types/minimist": "^1.2.1",
@@ -123,6 +125,7 @@
     "copy-webpack-plugin": "^6.0.3",
     "cson-parser": "^1.3.3",
     "css-loader": "^3.2.0",
+    "cssnano": "^4.1.10",
     "debounce": "^1.0.0",
     "deemon": "^1.4.0",
     "electron": "11.2.0",
@@ -140,7 +143,6 @@
     "gulp-bom": "^3.0.0",
     "gulp-buffer": "0.0.2",
     "gulp-concat": "^2.6.1",
-    "gulp-cssnano": "^2.1.3",
     "gulp-eslint": "^5.0.0",
     "gulp-filter": "^5.1.0",
     "gulp-flatmap": "^1.0.2",
@@ -148,6 +150,7 @@
     "gulp-gzip": "^1.4.2",
     "gulp-json-editor": "^2.5.0",
     "gulp-plumber": "^1.2.0",
+    "gulp-postcss": "^9.0.0",
     "gulp-remote-retry-src": "^0.6.0",
     "gulp-rename": "^1.2.0",
     "gulp-replace": "^0.5.4",