Add formatting libraries to composer.json

vendor/leafo/lessphp/tests/inputs/interpolation.less

@@ -0,0 +1,47 @@
+
+@cool-hello: "yes";
+@cool-yes: "okay";
+@var: "hello";
+
+div {
+	interp1: ~"@{cool-hello}";
+	interp2: ~"@{cool-@{var}}";
+	interp3: ~"@{cool-@{cool-@{var}}}";
+}
+
+// interpolation in selectors
+
+@hello: 10;
+@world: "yeah";
+
+@{hello}@{world} {
+	color: blue;
+}
+
+@{hello} {
+	color: blue;
+}
+
+hello world @{hello} {
+	color: red;
+}
+
+#@{world} {
+	color: "hello @{hello}";
+}
+
+
+@num: 3;
+
+[prop],
+[prop="value@{num}"],
+[prop*="val@{num}"],
+[|prop~="val@{num}"],
+[*|prop$="val@{num}"],
+[ns|prop^="val@{num}"],
+[@{num}^="val@{num}"],
+[@{num}=@{num}],
+[@{num}] {
+  attributes: yes;
+}
+