Fix less/scss format error (#12536)

changelog_unreleased/less/12536.md

@@ -0,0 +1,29 @@
+#### Fix LESS/SCSS format error (#12536 by @fisker)
+
+<!-- prettier-ignore -->
+```less
+// Input
+.background-gradient(@cut) {
+    background: linear-gradient(
+        to right,
+        @white 0%,
+        @white (@cut - 0.01%),
+        @portal-background @cut,
+        @portal-background 100%
+    );
+}
+
+// Prettier stable
+TypeError: Cannot read properties of undefined (reading 'endOffset')
+
+// Prettier main
+.background-gradient(@cut) {
+  background: linear-gradient(
+    to right,
+    @white 0%,
+    @white (@cut - 0.01%),
+    @portal-background @cut,
+    @portal-background 100%
+  );
+}
+```

src/language-css/printer-postcss.js

@@ -924,15 +924,16 @@ function genericPrint(path, options, print) {
                 if (
                   !isLast &&
                   child.type === "value-comma_group" &&
-                  child.groups &&
-                  child.groups[0].type !== "value-paren_group" &&
-                  isNextLineEmpty(
-                    options.originalText,
-                    getLast(child.groups),
-                    locEnd
-                  )
+                  isNonEmptyArray(child.groups)
                 ) {
-                  printed.push(hardline);
+                  const last = getLast(child.groups);
+                  if (
+                    // `value-paren_group` missing location info
+                    last.source &&
+                    isNextLineEmpty(options.originalText, last, locEnd)
+                  ) {
+                    printed.push(hardline);
+                  }
                 }
 
                 return printed;

tests/format/less/parens/2.less

@@ -0,0 +1,12 @@
+.background-gradient(@cut) {
+    background: linear-gradient(
+        to right,
+
+
+        /* Should preserve empty lines */
+        @white 0%,
+        @white (@cut - 0.01%),
+        @portal-background @cut,
+        @portal-background 100%
+    );
+}

tests/format/less/parens/__snapshots__/jsfmt.spec.js.snap

@@ -1,5 +1,39 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`2.less format 1`] = `
+====================================options=====================================
+parsers: ["less"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+.background-gradient(@cut) {
+    background: linear-gradient(
+        to right,
+
+
+        /* Should preserve empty lines */
+        @white 0%,
+        @white (@cut - 0.01%),
+        @portal-background @cut,
+        @portal-background 100%
+    );
+}
+
+=====================================output=====================================
+.background-gradient(@cut) {
+  background: linear-gradient(
+    to right,
+
+    /* Should preserve empty lines */ @white 0%,
+    @white (@cut - 0.01%),
+    @portal-background @cut,
+    @portal-background 100%
+  );
+}
+
+================================================================================
+`;
+
 exports[`parens.less format 1`] = `
 ====================================options=====================================
 parsers: ["less"]

tests/format/scss/parens/2.scss

@@ -0,0 +1,15 @@
+$icons: (
+  cal-day-group:
+    (
+      left: 253,
+      top: 73,
+    ),
+
+
+  /* Should preserve empty lines */
+  cal-week-group:
+    (
+      left: 1,
+      top: 169,
+    )
+);

tests/format/scss/parens/__snapshots__/jsfmt.spec.js.snap

@@ -1,5 +1,43 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`2.scss format 1`] = `
+====================================options=====================================
+parsers: ["scss"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+$icons: (
+  cal-day-group:
+    (
+      left: 253,
+      top: 73,
+    ),
+
+
+  /* Should preserve empty lines */
+  cal-week-group:
+    (
+      left: 1,
+      top: 169,
+    )
+);
+
+=====================================output=====================================
+$icons: (
+  cal-day-group: (
+    left: 253,
+    top: 73,
+  ),
+  /* Should preserve empty lines */ cal-week-group:
+    (
+      left: 1,
+      top: 169,
+    ),
+);
+
+================================================================================
+`;
+
 exports[`parens.scss format 1`] = `
 ====================================options=====================================
 parsers: ["scss"]