internal/warpc: Enable KaTeX mhchem extension

internal/warpc/js/package.json

@@ -9,6 +9,6 @@
   "license": "ISC",
   "description": "",
   "devDependencies": {
-    "katex": "^0.16.11"
+    "katex": "^0.16.21"
   }
 }

internal/warpc/js/renderkatex.js

@@ -1,5 +1,6 @@
 import { readInput, writeOutput } from './common';
 import katex from 'katex';
+import 'katex/contrib/mhchem/mhchem.js';
 
 const render = function (input) {
 	const data = input.data;

internal/warpc/warpc_test.go

@@ -77,6 +77,13 @@ func TestKatex(t *testing.T) {
 		c.Assert(result.GetID(), qt.Equals, id)
 	})
 
+	c.Run("Chemistry", func(c *qt.C) {
+		id := uint32(32)
+		result, err := runExpression(c, id, "C_p[\\ce{H2O(l)}] = \\pu{75.3 J // mol K}")
+		c.Assert(err, qt.IsNil)
+		c.Assert(result.GetID(), qt.Equals, id)
+	})
+
 	c.Run("Invalid expression", func(c *qt.C) {
 		id := uint32(32)
 		result, err := runExpression(c, id, "c & \\foo\\")