chore(deps): bump TypeScript to 3.9 (#1302)

Author: JustinBeckwith

package.json

@@ -91,7 +91,7 @@
     "timekeeper": "^2.0.0",
     "tmp": "0.2.1",
     "ts-node": "^8.0.0",
-    "typescript": "3.6.4",
+    "typescript": "^3.9.6",
     "@microsoft/api-documenter": "^7.8.10",
     "@microsoft/api-extractor": "^7.8.10"
   },

test/test-cls-ah.ts

@@ -39,7 +39,7 @@ describe('AsyncHooks-based CLS', () => {
         fn: (this: This, ...args: any[]) => Result,
         thisArg?: This
       ): Result {
-        if (super.runInAsyncScope) {
+        if (typeof super.runInAsyncScope === 'function') {
           // eslint-disable-next-line prefer-rest-params
           return super.runInAsyncScope.apply(this, arguments);
         } else {

test/test-config.ts

@@ -108,7 +108,6 @@ describe('Behavior set by config for Tracer', () => {
       return config.pluginLoaderConfig.tracerConfig;
     } else {
       assert.fail('Configuration was not enabled.');
-      throw new Error(); // unreachable.
     }
   };
 

test/test-trace-writer.ts

@@ -143,7 +143,7 @@ describe('Trace Writer', () => {
           _cacheClientFromJSON: typeof writer.authClient.fromJSON;
         },
         '_cacheClientFromJSON',
-        cacheClientFromJSON => {
+        ((cacheClientFromJSON: Function) => {
           return function (
             this: GoogleAuth,
             json: JWTInput,
@@ -152,7 +152,7 @@ describe('Trace Writer', () => {
             capturedJson = json;
             return cacheClientFromJSON.call(this, json, options);
           };
-        }
+        }) as never
       );
       await writer.authClient.getClient();
       shimmer.unwrap(