pin `@types/node` to v8

package-lock.json

@@ -49,9 +49,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "10.12.18",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.12.18.tgz",
-      "integrity": "sha512-fh+pAqt4xRzPfqA6eh3Z2y6fyZavRIumvjhaCL753+TVkGKGhpPeyrJG2JftD0T9q4GF00KjefsQ+PQNDdWQaQ==",
+      "version": "8.10.49",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.10.49.tgz",
+      "integrity": "sha512-YX30JVx0PvSmJ3Eqr74fYLGeBxD+C7vIL20ek+GGGLJeUbVYRUW3EzyAXpIRA0K8c8o0UWqR/GwEFYiFoz1T8w==",
       "dev": true
     },
     "@typescript-eslint/eslint-plugin": {

package.json

@@ -57,7 +57,7 @@
   "homepage": "https://github.com/sveltejs/svelte#README",
   "devDependencies": {
     "@types/mocha": "^5.2.0",
-    "@types/node": "^10.5.5",
+    "@types/node": "=8",
     "@typescript-eslint/eslint-plugin": "^1.9.0",
     "@typescript-eslint/parser": "^1.9.0",
     "acorn": "^6.1.1",