Add eslint and prettier.

src/emulator-launcher.ts

@@ -1,8 +1,6 @@
 /**
  * Creates and launches a new AVD instance with the specified configurations.
  */
-export async function startEmulator(
-
-): Promise<void> {
+export async function startEmulator(): Promise<void> {
   // TODO
 }

src/input-validator.ts

@@ -1,5 +1,3 @@
-import { isNumber } from "util";
-
 export const MIN_API_LEVEL = 21;
 export const VALID_TARGETS: Array<string> = ['default', 'google_apis'];
 export const VALID_ABIS: Array<string> = ['x86', 'x86_64'];

src/main.ts

@@ -1,5 +1,5 @@
 import * as core from '@actions/core';
-import { InputOptions } from "@actions/core/lib/core";
+import { InputOptions } from '@actions/core/lib/core';
 import { installAndroidSdk } from './sdk-installer';
 import { checkApiLevel, checkTarget, checkAbi, checkHeadless } from './input-validator';
 
@@ -11,7 +11,7 @@ async function run() {
     }
 
     // API level of the platform and system image
-    const apiLevel = core.getInput('api-level', <InputOptions>{required: true});
+    const apiLevel = core.getInput('api-level', { required: true } as InputOptions);
     checkApiLevel(apiLevel);
     console.log(`API level: ${apiLevel}`);