Convert tests to TS

.mocharc.yml

@@ -2,3 +2,4 @@ throw-deprecation: true
 check-leaks: true
 require:
   - '@babel/register'
+  - ts-node/register

package.json

@@ -30,7 +30,7 @@
   "scripts": {
     "test": "npm run prettier:check && npm run lint && npm run check && npm run testonly && npm run build && npm run check:integrations",
     "test:ci": "npm ci && npm run prettier:check && npm run lint && npm run check && npm run testonly:cover && npm run build && npm run check:integrations",
-    "testonly": "mocha src/**/__tests__/**/*.js",
+    "testonly": "mocha src/**/__tests__/**/*.ts",
     "testonly:cover": "nyc npm run testonly",
     "lint": "eslint src resources integrationTests",
     "prettier": "prettier --ignore-path .gitignore --write --list-different '**/*.{js,ts,md,json,yml}'",
@@ -53,7 +53,16 @@
     "@babel/plugin-transform-flow-strip-types": "7.10.1",
     "@babel/preset-env": "7.10.2",
     "@babel/register": "7.10.1",
+    "@types/body-parser": "1.19.0",
+    "@types/chai": "4.2.11",
+    "@types/connect": "3.4.33",
+    "@types/express": "4.17.6",
+    "@types/mocha": "7.0.2",
+    "@types/multer": "1.4.3",
     "@types/node": "14.0.11",
+    "@types/restify": "8.4.2",
+    "@types/sinon": "9.0.4",
+    "@types/supertest": "2.0.9",
     "@typescript-eslint/eslint-plugin": "3.1.0",
     "@typescript-eslint/parser": "3.1.0",
     "babel-eslint": "10.1.0",
@@ -80,6 +89,7 @@
     "restify": "4.3.2",
     "sinon": "9.0.2",
     "supertest": "4.0.2",
+    "ts-node": "8.10.2",
     "typescript": "3.9.5",
     "unfetch": "4.1.0"
   },