Add a local pg and perl links.

package.json

@@ -27,7 +27,7 @@
         "@codemirror/lang-html": "^6.4.9",
         "@codemirror/lang-xml": "^6.1.0",
         "@codemirror/theme-one-dark": "^6.1.2",
-        "@openwebwork/codemirror-lang-pg": "^0.0.1-beta.12",
+        "@openwebwork/codemirror-lang-pg": "file:../codemirror-lang-pg-link",
         "@replit/codemirror-emacs": "^6.1.0",
         "@replit/codemirror-vim": "^6.2.1",
         "cm6-theme-basic-dark": "^0.2.0",
@@ -39,8 +39,8 @@
         "cm6-theme-solarized-dark": "^0.2.0",
         "cm6-theme-solarized-light": "^0.2.0",
         "codemirror": "^6.0.1",
-        "codemirror-lang-mt": "^0.0.2-beta.1",
-        "codemirror-lang-perl": "^0.1.5-beta.3",
+        "codemirror-lang-mt": "file:../codemirror-lang-mt-link",
+        "codemirror-lang-perl": "file:../codemirror-lang-perl-link",
         "thememirror": "^2.0.1"
     },
     "devDependencies": {

webpack.config.mjs

@@ -19,7 +19,14 @@ export default (_env, argv) => {
             modules: ['node_modules'],
             extensions: ['.ts', '.js'],
             mainFields: ['browser', 'module', 'main'],
-            alias: { src: path.resolve(import.meta.dirname, 'src') }
+            alias: { src: path.resolve(import.meta.dirname, 'src') },
+            symlinks: false
+        },
+        snapshot: {
+            managedPaths: [
+                // eslint-disable-next-line @stylistic/max-len
+                /^(.+?[\\/]node_modules[\\/](?!(@openwebwork[\\/]codemirror-lang-pg)|(codemirror-lang-(perl|mt)))(@.+?[\\/])?.+?)[\\/]/
+            ]
         },
         module: {
             rules: [