added variable fonts support

lib/single-file/css-fonts-minifier.js

@@ -181,18 +181,32 @@ this.fontsMinifier = this.fontsMinifier || (() => {
 			return { src: fontSource.match(REGEXP_FONT_SRC)[1], format: fontFormat };
 		});
 		const fontTest = (fontSource, format) => fontSource.format == format;
-		const woff2FontFound = fontSources.find(fontSource => fontTest(fontSource, "woff2"));
-		const woffFontFound = fontSources.find(fontSource => fontTest(fontSource, "woff"));
+		let woffFontFound = fontSources.find(fontSource => fontTest(fontSource, "woff2-variations"));
+		if (!woffFontFound) {
+			woffFontFound = fontSources.find(fontSource => fontTest(fontSource, "woff2"));
+		}
+		if (!woffFontFound) {
+			woffFontFound = fontSources.find(fontSource => fontTest(fontSource, "woff"));
+		}
 		stats.fonts.processed += fontSources.length;
 		stats.fonts.discarded += fontSources.length;
-		if (woffFontFound || woff2FontFound) {
-			fontSources = fontSources.filter(fontSource => woff2FontFound ? fontTest(fontSource, "woff2") : fontTest(fontSource, "woff"));
+		if (woffFontFound) {
+			fontSources = fontSources.filter(fontSource => fontTest(fontSource, woffFontFound.format));
 		} else {
-			const ttfFontFound = fontSources.find(fontSource => fontTest(fontSource, "truetype"));
-			const otfFontFound = fontSources.find(fontSource => fontTest(fontSource, "opentype"));
-			const otfAltFontFound = fontSources.find(fontSource => fontTest(fontSource, "embedded-opentype"));
-			if (otfFontFound || otfAltFontFound || ttfFontFound) {
-				fontSources = fontSources.filter(fontSource => ttfFontFound ? fontTest(fontSource, "truetype") : otfFontFound ? fontTest(fontSource, "opentype") : fontTest(fontSource, "embedded-opentype"));
+			let ttfFontFound = fontSources.find(fontSource => fontTest(fontSource, "truetype-variations"));
+			if (!ttfFontFound) {
+				ttfFontFound = fontSources.find(fontSource => fontTest(fontSource, "truetype"));
+			}
+			if (ttfFontFound) {
+				fontSources = fontSources.filter(fontSource => fontTest(fontSource, ttfFontFound.format));
+			} else {
+				let otfFontFound = fontSources.find(fontSource => fontTest(fontSource, "opentype"));
+				if (!otfFontFound) {
+					otfFontFound = fontSources.find(fontSource => fontTest(fontSource, "embedded-opentype"));
+				}
+				if (otfFontFound) {
+					fontSources = fontSources.filter(fontSource => fontTest(fontSource, otfFontFound.format));
+				}
 			}
 		}
 		stats.fonts.discarded -= fontSources.length;