1 files changed, 63 insertions, 0 deletions
diff --git a/node_modules/csso/lib/replace/Dimension.js b/node_modules/csso/lib/replace/Dimension.js
new file mode 100644
index 00000000..edb00388
--- /dev/null
+++ b/node_modules/csso/lib/replace/Dimension.js
@@ -0,0 +1,63 @@
+import { packNumber } from './Number.js';
+
+const MATH_FUNCTIONS = new Set([
+    'calc',
+    'min',
+    'max',
+    'clamp'
+]);
+const LENGTH_UNIT = new Set([
+    // absolute length units
+    'px',
+    'mm',
+    'cm',
+    'in',
+    'pt',
+    'pc',
+
+    // relative length units
+    'em',
+    'ex',
+    'ch',
+    'rem',
+
+    // viewport-percentage lengths
+    'vh',
+    'vw',
+    'vmin',
+    'vmax',
+    'vm'
+]);
+
+export default function compressDimension(node, item) {
+    const value = packNumber(node.value);
+
+    node.value = value;
+
+    if (value === '0' && this.declaration !== null && this.atrulePrelude === null) {
+        const unit = node.unit.toLowerCase();
+
+        // only length values can be compressed
+        if (!LENGTH_UNIT.has(unit)) {
+            return;
+        }
+
+        // issue #362: shouldn't remove unit in -ms-flex since it breaks flex in IE10/11
+        // issue #200: shouldn't remove unit in flex since it breaks flex in IE10/11
+        if (this.declaration.property === '-ms-flex' ||
+            this.declaration.property === 'flex') {
+            return;
+        }
+
+        // issue #222: don't remove units inside calc
+        if (this.function && MATH_FUNCTIONS.has(this.function.name)) {
+            return;
+        }
+
+        item.data = {
+            type: 'Number',
+            loc: node.loc,
+            value
+        };
+    }
+};