diff --git a/packages/generators/init-generator.ts b/packages/generators/init-generator.ts
index 8ba18e4ca65..dc24b290511 100644
--- a/packages/generators/init-generator.ts
+++ b/packages/generators/init-generator.ts
@@ -92,7 +92,7 @@ export default class InitGenerator extends Generator {
 		}
 	}
 
-	public async prompting() {
+	public async prompting(): Promise<void | {}> {
 		const done: () => {} = this.async();
 		const self: this = this;
 		let regExpForStyles: string;
diff --git a/packages/generators/remove-generator.ts b/packages/generators/remove-generator.ts
index 9af3b862592..7054fbcdfdc 100644
--- a/packages/generators/remove-generator.ts
+++ b/packages/generators/remove-generator.ts
@@ -1,4 +1,3 @@
-import * as fs from "fs";
 import * as path from "path";
 import * as Generator from "yeoman-generator";
 
@@ -34,7 +33,6 @@ export default class RemoveGenerator extends Generator {
 		};
 		const { configFile } = opts;
 		let configPath = path.resolve(process.cwd(), configFile);
-		const webpackConfigExists = fs.existsSync(configPath);
 		this.webpackOptions = require(configPath);
 	}
 
diff --git a/packages/migrate/commonsChunkPlugin/commonsChunkPlugin.ts b/packages/migrate/commonsChunkPlugin/commonsChunkPlugin.ts
index 62bc6a090e2..a6b82abe074 100644
--- a/packages/migrate/commonsChunkPlugin/commonsChunkPlugin.ts
+++ b/packages/migrate/commonsChunkPlugin/commonsChunkPlugin.ts
@@ -197,7 +197,7 @@ export default function(j: JSCodeshift, ast: Node): Node {
 
 								// eslint-disable-next-line
 								cacheGroup[chunkKey] = cacheGroup[chunkKey].map(
-									(prop): any =>
+									(prop): string | void =>
 										prop.key.name === "test"
 											? mergeTestPropArrowFunction(j, chunkKey, pathValue)
 											: prop