Revert "Remove trailing commas for IE 9 compatibility"

This reverts commit 4d2e46e7f6.

Having trailing commans makes diffs easier to read as it avoids modifying a
line just to add a trailing comma if there is another item to add at the end
of a list.  There are plans to switch to ES6 notation and to translate that
to ES5 as part of the build process.  Since that translation would remove
trailing commas, the IE9 problems that originally motivated the commit
should vanish soon.

test/katex-spec.js

@@ -17,7 +17,7 @@ var Style = require("../src/Style");
 var defaultSettings = new Settings({});
 var defaultOptions = new Options({
     style: Style.TEXT,
-    size: "size5"
+    size: "size5",
 });
 
 var _getBuilt = function(expr, settings) {
@@ -97,11 +97,11 @@ beforeEach(function() {
 
                     var result = {
                         pass: true,
-                        message: "'" + actual + "' succeeded parsing"
+                        message: "'" + actual + "' succeeded parsing",
                     };
                     parseAndSetResult(actual, result, usedSettings);
                     return result;
-                }
+                },
             };
         },
 
@@ -113,7 +113,7 @@ beforeEach(function() {
                     var result = {
                         pass: false,
                         message: "Expected '" + actual + "' to fail " +
-                            "parsing, but it succeeded"
+                            "parsing, but it succeeded",
                     };
 
                     try {
@@ -130,7 +130,7 @@ beforeEach(function() {
                     }
 
                     return result;
-                }
+                },
             };
         },
 
@@ -141,7 +141,7 @@ beforeEach(function() {
 
                     var result = {
                         pass: true,
-                        message: "'" + actual + "' succeeded in building"
+                        message: "'" + actual + "' succeeded in building",
                     };
 
                     expect(actual).toParse(usedSettings);
@@ -160,7 +160,7 @@ beforeEach(function() {
                     }
 
                     return result;
-                }
+                },
             };
         },
 
@@ -170,7 +170,7 @@ beforeEach(function() {
                     var result = {
                         pass: true,
                         message: "Parse trees of '" + actual +
-                            "' and '" + expected + "' are equivalent"
+                            "' and '" + expected + "' are equivalent",
                     };
 
                     var actualTree = parseAndSetResult(actual, result);
@@ -189,9 +189,9 @@ beforeEach(function() {
                             "' and '" + expected + "' are not equivalent";
                     }
                     return result;
-                }
+                },
             };
-        }
+        },
 
     });
 });
@@ -1177,7 +1177,7 @@ describe("A TeX-compliant parser", function() {
             "\\rule{1em}",
             "\\llap",
             "\\bigl",
-            "\\text"
+            "\\text",
         ];
 
         for (var i = 0; i < missingGroups.length; i++) {
@@ -1204,7 +1204,7 @@ describe("A TeX-compliant parser", function() {
             // work
             // "\\llap \\frac x y",
             "\\llap \\llap x",
-            "\\sqrt \\llap x"
+            "\\sqrt \\llap x",
         ];
 
         for (var i = 0; i < badArguments.length; i++) {
@@ -1222,7 +1222,7 @@ describe("A TeX-compliant parser", function() {
             "\\frac x {\\llap y}",
             "\\llap {\\frac x y}",
             "\\llap {\\llap x}",
-            "\\sqrt {\\llap x}"
+            "\\sqrt {\\llap x}",
         ];
 
         for (var i = 0; i < goodArguments.length; i++) {
@@ -1235,7 +1235,7 @@ describe("A TeX-compliant parser", function() {
             "x^\\sqrt x",
             "x^\\llap x",
             "x_\\sqrt x",
-            "x_\\llap x"
+            "x_\\llap x",
         ];
 
         for (var i = 0; i < badSupSubscripts.length; i++) {
@@ -1248,7 +1248,7 @@ describe("A TeX-compliant parser", function() {
             "x^{\\sqrt x}",
             "x^{\\llap x}",
             "x_{\\sqrt x}",
-            "x_{\\llap x}"
+            "x_{\\llap x}",
         ];
 
         for (var i = 0; i < goodSupSubscripts.length; i++) {
@@ -1287,7 +1287,7 @@ describe("A TeX-compliant parser", function() {
             "\\frac x \\left( y \\right)",
             "\\llap \\left( x \\right)",
             "\\sqrt \\left( x \\right)",
-            "x^\\left( x \\right)"
+            "x^\\left( x \\right)",
         ];
 
         for (var i = 0; i < badLeftArguments.length; i++) {
@@ -1301,7 +1301,7 @@ describe("A TeX-compliant parser", function() {
             "\\frac x {\\left( y \\right)}",
             "\\llap {\\left( x \\right)}",
             "\\sqrt {\\left( x \\right)}",
-            "x^{\\left( x \\right)}"
+            "x^{\\left( x \\right)}",
         ];
 
         for (var i = 0; i < goodLeftArguments.length; i++) {
@@ -1721,17 +1721,17 @@ describe("A parse tree generator", function() {
                     "base": {
                         "type": "mathord",
                         "value": "\\sigma",
-                        "mode": "math"
+                        "mode": "math",
                     },
                     "sup": {
                         "type": "textord",
                         "value": "2",
-                        "mode": "math"
+                        "mode": "math",
                     },
-                    "sub": undefined
+                    "sub": undefined,
                 },
-                "mode": "math"
-            }
+                "mode": "math",
+            },
         ]));
     });
 });
@@ -1860,7 +1860,7 @@ describe("An array environment", function() {
         var parse = getParsed("\\begin{array}r1\\\\20\\end{array}");
         expect(parse[0].type).toBe("array");
         expect(parse[0].value.cols).toEqual([
-            { type: "align", align: "r" }
+            { type: "align", align: "r" },
         ]);
     });
 
@@ -1873,7 +1873,7 @@ describe("An array environment", function() {
             { type: "separator", separator: "|" },
             { type: "separator", separator: "|" },
             { type: "align", align: "c" },
-            { type: "separator", separator: "|" }
+            { type: "separator", separator: "|" },
         ]);
     });
 
@@ -1948,7 +1948,7 @@ describe("A parser that does not throw on unsupported commands", function() {
     var errorColor = "#933";
     var noThrowSettings = new Settings({
         throwOnError: false,
-        errorColor: errorColor
+        errorColor: errorColor,
     });
 
     it("should still parse on unrecognized control sequences", function() {
@@ -2009,7 +2009,7 @@ describe("A macro expander", function() {
     it("should allow for multiple expansion", function() {
         compareParseTree("1\\foo2", "1aa2", {
             "\\foo": "\\bar\\bar",
-            "\\bar": "a"
+            "\\bar": "a",
         });
     });
 });