Some large changes.

Started replacing the old antlr3 Tree/BaseTree/CommonTree with the antlr4 ParseTree.
This breaks the (few) unit tests, but I don't want the patch to grow too large.

Also switched to vitest for unit testing.

.vscode/launch.json

@@ -45,19 +45,19 @@
         {
             "type": "node",
             "request": "launch",
-            "name": "Run selected Jest test",
-            "runtimeExecutable": "npm",
-            "runtimeArgs": [
-                "t",
-            ],
+            "name": "Debug Current Test File",
+            "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs",
             "args": [
-                "--",
-                "-i",
-                "${file}",
-                "-t",
-                "--no-coverage"
+                "run",
+                "${relativeFile}"
+            ],
+            "autoAttachChildProcesses": true,
+            "skipFiles": [
+                "<node_internals>/**",
+                "**/node_modules/**"
             ],
             "console": "integratedTerminal",
-        },
+            "smartStep": true
+        }
     ]
 }

build/generate-tool-parsers.sh

@@ -6,6 +6,6 @@ printf "\x1b[1m\x1b[34mGenerating tool parsers...\x1b[0m\n\n"
 antlr4ng -Dlanguage=TypeScript -no-visitor -no-listener -Xexact-output-dir -o ./src/generated ./src/grammars/ActionSplitter.g4
 antlr4ng -Dlanguage=TypeScript -no-visitor -no-listener -Xexact-output-dir -o ./src/generated ./src/grammars/LexBasic.g4
 antlr4ng -Dlanguage=TypeScript -no-visitor -no-listener -Xexact-output-dir -o ./src/generated ./src/grammars/ANTLRv4Lexer.g4
-antlr4ng -Dlanguage=TypeScript -no-visitor -no-listener -Xexact-output-dir -o ./src/generated ./src/grammars/ANTLRv4Parser.g4
+antlr4ng -Dlanguage=TypeScript -visitor -no-listener -Xexact-output-dir -o ./src/generated ./src/grammars/ANTLRv4Parser.g4
 
 printf "done\n\n"

eslint.config.mjs

@@ -15,6 +15,10 @@ export default tslint.config(
     ...tslint.configs.strictTypeChecked,
     ...tslint.configs.stylisticTypeChecked,
     jsdoc.configs["flat/recommended"],
+    {
+        // This must be in its own object to avoid a bug in the ESLint parser.
+        ignores: ["src/generated/*"],
+    },
     {
         plugins: {
             "@stylistic": stylistic,
@@ -51,6 +55,8 @@ export default tslint.config(
                 }
             ],
             "brace-style": ["error", "1tbs", { "allowSingleLine": false }],
+            "curly": ["error", "all"],
+            "arrow-body-style": ["error", "always"],
             "@stylistic/padding-line-between-statements": [
                 "error",
                 {
@@ -229,20 +235,28 @@ export default tslint.config(
             "@typescript-eslint/prefer-return-this-type": "off",
             "@typescript-eslint/no-invalid-void-type": "off",
             "@typescript-eslint/unified-signatures": "off",
+            "@typescript-eslint/no-empty-object-type": "off",
+            "@typescript-eslint/explicit-member-accessibility": "error",
+            "@typescript-eslint/prefer-for-of": "error",
+            "@typescript-eslint/prefer-function-type": "error",
+            "@typescript-eslint/no-deprecated": "off",
             "jsdoc/check-alignment": "error",
             "jsdoc/check-indentation": "off",
             "jsdoc/require-param-type": "off",
             "jsdoc/require-returns-type": "off",
-            "jsdoc/tag-lines": [
-                // Have to switch this off, as it is not good enough to be used.
-                "off"
-            ],
             "jsdoc/no-undefined-types": [
                 "off", // Requires a comment syntax incompatible with VS Code.
                 {
                     "markVariablesAsUsed": false
                 }
             ],
+            "jsdoc/tag-lines": [
+                "error",
+                "any",
+                {
+                    "startLines": 1
+                }
+            ],
             "prefer-arrow/prefer-arrow-functions": [
                 "warn",
                 {