Remove TypeScript tests

package.json

@@ -31,23 +31,19 @@
     "safe-buffer": "~5.1.1"
   },
   "devDependencies": {
-    "@types/node": "^8.0.47",
     "airtap": "^0.0.5",
     "faucet": "^0.0.1",
     "istanbul": "^0.4.2",
     "istanbul-coveralls": "^1.0.3",
     "rimraf": "^2.6.2",
     "standard": "^11.0.0",
-    "tape": "^4.8.0",
-    "ts-node": "^4.1.0",
-    "typescript": "^2.6.2"
+    "tape": "^4.8.0"
   },
   "browser": {
     "./immediate.js": "./immediate-browser.js"
   },
   "scripts": {
-    "test": "standard && node test.js --stderr | faucet && npm run test-ts",
-    "test-ts": "ts-node --no-cache test.js | faucet",
+    "test": "standard && node test.js --stderr | faucet",
     "test-browsers": "airtap --sauce-connect --loopback airtap.local --no-coverage test.js",
     "test-browser-local": "airtap --no-coverage --local 9000 test.js",
     "coverage": "istanbul cover -i memdown.js ./node_modules/.bin/tape ./test.js && istanbul check-coverage --lines 90 --function 80 --statements 90 --branches 80",
@@ -63,12 +59,5 @@
     "immediate.js",
     "immediate-browser.js",
     "UPGRADING.md"
-  ],
-  "greenkeeper": {
-    "ignore": [
-      "@types/node",
-      "ts-node",
-      "typescript"
-    ]
-  }
+  ]
 }

test.js

@@ -430,10 +430,6 @@ function stringBuffer (value) {
   return Buffer.from(String(value))
 }
 
-/**
- * We need this JSDoc to keep TypeScript happy.
- * @return {object}
- */
 function putKey (key) {
   return { type: 'put', key: key, value: 'value' }
 }