diff --git a/package.json b/package.json
index 6479b12..5ef42c7 100644
--- a/package.json
+++ b/package.json
@@ -47,9 +47,10 @@
 		"symbol-observable": "^1.2.0"
 	},
 	"devDependencies": {
+		"@sindresorhus/tsconfig": "^0.1.0",
 		"@types/jsdom": "^11.12.0",
-		"@types/node": "^10.11.2",
-		"@types/tempy": "^0.1.0",
+		"@types/node": "^10.12.10",
+		"@types/tempy": "^0.2.0",
 		"@types/zen-observable": "^0.8.0",
 		"ava": "*",
 		"del-cli": "^1.1.0",
@@ -57,8 +58,8 @@
 		"rxjs": "^6.3.3",
 		"tempy": "^0.2.1",
 		"tslint": "^5.9.1",
-		"tslint-xo": "^0.9.0",
-		"typescript": "^3.1.4",
+		"tslint-xo": "^0.10.0",
+		"typescript": "^3.2.1",
 		"zen-observable": "^0.8.8"
 	},
 	"types": "dist/index.d.ts"
diff --git a/source/index.ts b/source/index.ts
index 8b52bc1..37e775b 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -60,7 +60,7 @@ const isOfType = <T>(type: string) => (value: unknown): value is T => typeof val
 const isBuffer = (input: unknown): input is Buffer => !is.nullOrUndefined(input) && !is.nullOrUndefined((input as Buffer).constructor) && is.function_((input as Buffer).constructor.isBuffer) && (input as Buffer).constructor.isBuffer(input);
 
 const getObjectType = (value: unknown): TypeName | null => {
-	const objectName = toString.call(value).slice(8, -1) as string;
+	const objectName = toString.call(value).slice(8, -1);
 
 	if (objectName) {
 		return objectName as TypeName;
@@ -301,7 +301,7 @@ namespace is { // tslint:disable-line:no-namespace
 			throw new TypeError('Invalid number of values');
 		}
 
-		return method.call(values, predicate);
+		return method.call(values, predicate as any);
 	};
 
 	// tslint:disable variable-name
diff --git a/source/tests/test.ts b/source/tests/test.ts
index 4fcac81..98cb287 100644
--- a/source/tests/test.ts
+++ b/source/tests/test.ts
@@ -21,8 +21,8 @@ const {document} = window;
 const createDomElement = (element: string) => document.createElement(element);
 
 interface Test {
-	is(value: unknown): boolean;
 	fixtures: unknown[];
+	is(value: unknown): boolean;
 }
 
 const types = new Map<string, Test>([
diff --git a/tsconfig.json b/tsconfig.json
index e1bc1fa..5f5c71e 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,4 +1,5 @@
 {
+	"extends": "@sindresorhus/tsconfig",
 	"compilerOptions": {
 		"outDir": "dist",
 		"target": "es2016",
@@ -7,27 +8,6 @@
 			"es2017.sharedmemory",
 			"esnext.asynciterable",
 			"dom"
-		],
-		"module": "commonjs",
-		"moduleResolution": "node",
-		"esModuleInterop": true,
-		"allowSyntheticDefaultImports": true,
-		"sourceMap": true,
-		"declaration": true,
-		"pretty": true,
-		"newLine": "lf",
-		"stripInternal": true,
-		"strict": true,
-		"noImplicitReturns": true,
-		"noUnusedLocals": true,
-		"noUnusedParameters": true,
-		"noFallthroughCasesInSwitch": true,
-		"noEmitOnError": true,
-		"forceConsistentCasingInFileNames": true,
-		"skipLibCheck": true
-	},
-	"exclude": [
-		"node_modules",
-		"dist"
-	]
+		]
+	}
 }