Fix number order condition (#627)

Author: constanzauanini

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@terraware/web-components",
-  "version": "3.1.1",
+  "version": "3.1.2-rc.0",
   "author": "Terraformation Inc.",
   "license": "Apache-2.0",
   "repository": {

src/components/table/sort.test.ts

@@ -28,12 +28,12 @@ test('compare equal string fields', () => {
 
 test('compare unequal number fields with same whole number digits', () => {
   const cmp = descendingComparator(rowA, rowB, 'number1', 'desc');
-  expect(Math.sign(cmp)).toEqual(1);
+  expect(Math.sign(cmp)).toEqual(-1);
 });
 
 test('compare unequal number fields with differing whole number digits', () => {
   const cmp = descendingComparator(rowA, rowB, 'number2', 'desc');
-  expect(Math.sign(cmp)).toEqual(-1);
+  expect(Math.sign(cmp)).toEqual(1);
 });
 
 test('compare equal number fields', () => {

src/components/table/sort.ts

@@ -2,7 +2,11 @@ export function descendingComparator<T>(a: T, b: T, orderBy: keyof T, order: Sor
   // first attempt to parse into a numeric value and compare
   const numCompare = descendingNumComparator(a, b, orderBy);
   if (numCompare !== null) {
-    return order === 'desc' ? numCompare : numCompare * -1;
+    if (numCompare === 0) {
+      return numCompare;
+    } else {
+      return order === 'desc' ? numCompare * -1 : numCompare;
+    }
   }
 
   // if non-numeric, compare using the javascript built-in compare for this type