feat!: drop node8 support, support for async iterators

.eslintrc.json

@@ -1,3 +1,3 @@
 {
-    "extends": "./node_modules/gts"
+  "extends": "./node_modules/gts"
 }

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [8, 10, 12, 13]
+        node: [10, 12, 13]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1

.prettierrc.js

@@ -13,5 +13,5 @@
 // limitations under the License.
 
 module.exports = {
-    ...require('gts/.prettierrc.json')
+  ...require('gts/.prettierrc.json')
 }

package.json

@@ -5,7 +5,7 @@
   "license": "Apache-2.0",
   "author": "Google LLC",
   "engines": {
-    "node": ">=10.0.0"
+    "node": ">=10"
   },
   "repository": "googleapis/nodejs-asset",
   "main": "build/src/index.js",
@@ -43,24 +43,26 @@
     "prelint": "cd samples; npm link ../; npm i"
   },
   "dependencies": {
-    "google-gax": "^1.15.1",
+    "google-gax": "^2.0.1",
     "protobufjs": "^6.8.9"
   },
   "devDependencies": {
     "@types/mocha": "^7.0.2",
     "@types/node": "^13.9.3",
+    "@types/sinon": "^7.5.2",
     "c8": "^7.1.0",
     "codecov": "^3.6.5",
-    "gts": "^2.0.0-alpha.5",
+    "gts": "next",
     "jsdoc": "^3.6.3",
     "jsdoc-fresh": "^1.0.2",
     "jsdoc-region-tag": "^1.0.4",
     "linkinator": "^2.0.4",
     "mocha": "^7.1.1",
     "null-loader": "^3.0.0",
     "pack-n-play": "^1.0.0-2",
+    "sinon": "^9.0.1",
     "ts-loader": "^6.2.2",
-    "typescript": "~3.8.3",
+    "typescript": "^3.8.3",
     "webpack": "^4.42.0",
     "webpack-cli": "^3.3.11"
   }