fixes #3154 upgraded webpack to version 5.3.2 with types property in ligatures tsconfig

addons/xterm-addon-ligatures/src/tsconfig.json

@@ -1,16 +1,14 @@
 {
-    "compilerOptions": {
-        "target": "es2017",
-        "module": "commonjs",
-        "sourceMap": true,
-        "outDir": "../out",
-        "rootDir": ".",
-        "strict": true,
-        "noUnusedLocals": true,
-        "preserveWatchOutput": true
-    },
-    "include": [
-        "./**/*",
-        "../../../typings/xterm.d.ts"
-    ]
+  "compilerOptions": {
+    "target": "es2017",
+    "module": "commonjs",
+    "sourceMap": true,
+    "outDir": "../out",
+    "rootDir": ".",
+    "strict": true,
+    "noUnusedLocals": true,
+    "preserveWatchOutput": true,
+    "types": ["../../../node_modules/@types/mocha"]
+  },
+  "include": ["./**/*", "../../../typings/xterm.d.ts"]
 }

package.json

@@ -61,7 +61,7 @@
     "ts-loader": "^8.0.7",
     "typescript": "4.0",
     "utf8": "^3.0.0",
-    "webpack": "^4.44.2",
+    "webpack": "^5.3.2",
     "webpack-cli": "^4.1.0",
     "ws": "^7.3.1",
     "xterm-benchmark": "^0.1.3"