diff --git a/index.js b/index.js
index 2569e03..4a5cdfe 100644
--- a/index.js
+++ b/index.js
@@ -24,7 +24,7 @@ class Blob {
 	 * @param {(ArrayBufferLike | ArrayBufferView | Blob | Buffer | string)[]} blobParts
 	 * @param {{ type?: string }} [options]
 	 */
-	constructor(blobParts = [], options = {type: ''}) {
+	constructor(blobParts = [], options = {}) {
 		let size = 0;
 
 		const parts = blobParts.map(element => {
@@ -41,6 +41,7 @@ class Blob {
 				buffer = Buffer.from(typeof element === 'string' ? element : String(element));
 			}
 
+			// eslint-disable-next-line unicorn/explicit-length-check
 			size += buffer.length || buffer.size || 0;
 			return buffer;
 		});
diff --git a/package.json b/package.json
index 44e8e5f..a1c462c 100644
--- a/package.json
+++ b/package.json
@@ -30,23 +30,15 @@
         "url": "https://github.com/node-fetch/fetch-blob/issues"
     },
     "homepage": "https://github.com/node-fetch/fetch-blob#readme",
-    "devDependencies": {
-        "ava": "^3.8.2",
-        "c8": "^7.2.0",
-        "codecov": "^3.7.0",
-        "domexception": "^2.0.1",
-        "get-stream": "^5.1.0",
-        "node-fetch": "^2.6.0",
-        "typescript": "^3.9.5",
-        "xo": "^0.32.0"
-    },
     "xo": {
         "rules": {
             "unicorn/import-index": "off",
             "import/extensions": [
                 "error",
                 "always",
-                { "ignorePackages": true }
+                {
+                    "ignorePackages": true
+                }
             ]
         },
         "overrides": [
@@ -59,12 +51,19 @@
             }
         ]
     },
-    "peerDependencies": {
-        "domexception": "^2.0.1"
-    },
     "peerDependenciesMeta": {
         "domexception": {
             "optional": true
         }
+    },
+    "devDependencies": {
+        "ava": "^3.15.0",
+        "c8": "^7.7.1",
+        "codecov": "^3.8.1",
+        "domexception": "^2.0.1",
+        "get-stream": "^6.0.1",
+        "node-fetch": "^2.6.1",
+        "typescript": "^4.2.4",
+        "xo": "^0.38.2"
     }
 }
diff --git a/test.js b/test.js
index 06f0f57..b6cf1a8 100644
--- a/test.js
+++ b/test.js
@@ -153,7 +153,9 @@ test('blob part backed up by filesystem', async t => {
 
 test('Reading after modified should fail', async t => {
 	const blob = blobFrom('./LICENSE');
-	await new Promise(resolve => setTimeout(resolve, 100));
+	await new Promise(resolve => {
+		setTimeout(resolve, 100);
+	});
 	const now = new Date();
 	// Change modified time
 	fs.utimesSync('./LICENSE', now, now);
@@ -163,7 +165,7 @@ test('Reading after modified should fail', async t => {
 
 test('Blob-ish class is an instance of Blob', t => {
 	class File {
-		stream() { }
+		stream() {}
 
 		get [Symbol.toStringTag]() {
 			return 'File';