Add formatting libraries to composer.json

vendor/leafo/lessphp/tests/outputs_lessjs/mixins-args.css

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+#hidden {
+  color: transparent;
+}
+#hidden1 {
+  color: transparent;
+}
+.two-args {
+  color: blue;
+  width: 10px;
+  height: 99%;
+  border: 2px dotted black;
+}
+.one-arg {
+  width: 15px;
+  height: 49%;
+}
+.no-parens {
+  width: 5px;
+  height: 49%;
+}
+.no-args {
+  width: 5px;
+  height: 49%;
+}
+.var-args {
+  width: 45;
+  height: 17%;
+}
+.multi-mix {
+  width: 10px;
+  height: 29%;
+  margin: 4;
+  padding: 5;
+}
+body {
+  padding: 30px;
+  color: #f00;
+}
+.scope-mix {
+  width: 8;
+}
+.content {
+  width: 600px;
+}
+.content .column {
+  margin: 600px;
+}
+#same-var-name {
+  radius: 5px;
+}
+#var-inside {
+  width: 10px;
+}
+.arguments {
+  border: 1px solid black;
+  width: 1px;
+}
+.arguments2 {
+  border: 0px;
+  width: 0px;
+}
+.arguments3 {
+  border: 0px;
+  width: 0px;
+}
+.arguments4 {
+  border: 0 1 2 3 4;
+  rest: 1 2 3 4;
+  width: 0;
+}
+.edge-case {
+  border: "{";
+  width: "{";
+}
+.slash-vs-math {
+  border-radius: 0.4px;
+  border-radius: 0.5px;
+  border-radius: 6px;
+}
+.comma-vs-semi-colon {
+  one: a;
+  two: b, c;
+  one: d, e;
+  two: f;
+  one: g;
+  one: h;
+  one: i;
+  one: j;
+  one: k;
+  two: l;
+  one: m, n;
+  one: o, p;
+  two: q;
+  one: r, s;
+  two: t;
+}
+#named-conflict {
+  four: a, 11, 12, 13;
+  four: a, 21, 22, 23;
+}
+.test-mixin-default-arg {
+  defaults: 1px 1px 1px;
+  defaults: 2px 2px 2px;
+}
+.selector {
+  margin: 2, 2, 2, 2;
+}
+.selector2 {
+  margin: 2, 2, 2, 2;
+}
+.selector3 {
+  margin: 4;
+}

vendor/leafo/lessphp/tests/outputs_lessjs/mixins-named-args.css

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+.named-arg {
+  color: blue;
+  width: 5px;
+  height: 99%;
+  args: 1px 100%;
+  text-align: center;
+}
+.class {
+  width: 5px;
+  height: 19%;
+  args: 1px 20%;
+}
+.all-args-wrong-args {
+  width: 10px;
+  height: 9%;
+  args: 2px 10%;
+}
+.named-args2 {
+  width: 15px;
+  height: 49%;
+  color: #646464;
+}
+.named-args3 {
+  width: 5px;
+  height: 29%;
+  color: #123456;
+}

vendor/leafo/lessphp/tests/outputs_lessjs/strings.css

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+#strings {
+  background-image: url("http://son-of-a-banana.com");
+  quotes: "~" "~";
+  content: "#*%:&^,)!.(~*})";
+  empty: "";
+  brackets: "{" "}";
+  escapes: "\"hello\" \\world";
+  escapes2: "\"llo";
+}
+#comments {
+  content: "/* hello */ // not-so-secret";
+}
+#single-quote {
+  quotes: "'" "'";
+  content: '""#!&""';
+  empty: '';
+  semi-colon: ';';
+}
+#escaped {
+  filter: DX.Transform.MS.BS.filter(opacity=50);
+}
+#one-line {
+  image: url(http://tooks.com);
+}
+#crazy {
+  image: url(http://), "}", url("http://}");
+}
+#interpolation {
+  url: "http://lesscss.org/dev/image.jpg";
+  url2: "http://lesscss.org/image-256.jpg";
+  url3: "http://lesscss.org#445566";
+  url4: "http://lesscss.org/hello";
+  url5: "http://lesscss.org/54.4px";
+}
+.mix-mul-class {
+  color: blue;
+  color: red;
+  color: black;
+  color: orange;
+}