Enable ExplicitResultTypes

.scalafix.conf

@@ -1,4 +1,5 @@
 rules = [
+  ExplicitResultTypes,
   OrganizeImports,
   RemoveUnused,
   GenerateApiReport,

prePR.sbt

@@ -19,13 +19,13 @@ ThisBuild / prePR_nonCross := Def.sequential(
     (example        / clean).value
   },
 
-  dom / Compile / scalafmt,
   Def.taskDyn {
-    if (scalaVersion.value.startsWith("2."))
+    if (scalaVersion.value.matches("2\\.1[23]\\..+"))
       (dom / Compile / scalafix).toTask("")
     else
-      Def.task[Unit]((dom / Compile / compile).value)
+      Def.task(())
   },
+  dom / Compile / scalafmt,
 
   Def.task {
     (testsShared    / Test / compile).value

src/main/scala/org/scalajs/dom/Fetch.scala

@@ -280,7 +280,7 @@ class Headers(map: HeadersInit = js.Array[js.Array[String]]()) extends js.Iterab
 sealed trait ReferrerPolicy extends js.Any
 
 object ReferrerPolicy {
-  val empty = "".asInstanceOf[ReferrerPolicy]
+  val empty: ReferrerPolicy = "".asInstanceOf[ReferrerPolicy]
   val `no-referrer` = "no-referrer".asInstanceOf[ReferrerPolicy]
 
   val `no-referrer-when-downgrade` =
@@ -298,14 +298,14 @@ object ReferrerPolicy {
 trait HttpMethod extends js.Any
 
 object HttpMethod {
-  val GET = "GET".asInstanceOf[HttpMethod]
-  val POST = "POST".asInstanceOf[HttpMethod]
-  val PUT = "PUT".asInstanceOf[HttpMethod]
-  val PATCH = "PATCH".asInstanceOf[HttpMethod]
-  val DELETE = "DELETE".asInstanceOf[HttpMethod]
-  val QUERY = "QUERY".asInstanceOf[HttpMethod]
-  val HEAD = "HEAD".asInstanceOf[HttpMethod]
-  val OPTIONS = "OPTIONS".asInstanceOf[HttpMethod]
+  val GET: HttpMethod = "GET".asInstanceOf[HttpMethod]
+  val POST: HttpMethod = "POST".asInstanceOf[HttpMethod]
+  val PUT: HttpMethod = "PUT".asInstanceOf[HttpMethod]
+  val PATCH: HttpMethod = "PATCH".asInstanceOf[HttpMethod]
+  val DELETE: HttpMethod = "DELETE".asInstanceOf[HttpMethod]
+  val QUERY: HttpMethod = "QUERY".asInstanceOf[HttpMethod]
+  val HEAD: HttpMethod = "HEAD".asInstanceOf[HttpMethod]
+  val OPTIONS: HttpMethod = "OPTIONS".asInstanceOf[HttpMethod]
 }
 
 /** Fetch APIs [[https://fetch.spec.whatwg.org/#requesttype RequestType enum]]
@@ -314,14 +314,14 @@ object HttpMethod {
 sealed trait RequestType extends js.Any
 
 object RequestType {
-  val empty = "".asInstanceOf[RequestType]
-  val audio = "audio".asInstanceOf[RequestType]
-  val font = "font".asInstanceOf[RequestType]
-  val image = "image".asInstanceOf[RequestType]
-  val script = "script".asInstanceOf[RequestType]
-  val style = "style".asInstanceOf[RequestType]
-  val track = "track".asInstanceOf[RequestType]
-  val video = "video".asInstanceOf[RequestType]
+  val empty: RequestType = "".asInstanceOf[RequestType]
+  val audio: RequestType = "audio".asInstanceOf[RequestType]
+  val font: RequestType = "font".asInstanceOf[RequestType]
+  val image: RequestType = "image".asInstanceOf[RequestType]
+  val script: RequestType = "script".asInstanceOf[RequestType]
+  val style: RequestType = "style".asInstanceOf[RequestType]
+  val track: RequestType = "track".asInstanceOf[RequestType]
+  val video: RequestType = "video".asInstanceOf[RequestType]
 }
 
 /** Fetch APIs [[https://fetch.spec.whatwg.org/#requestdestination RequestDestination enum]]
@@ -330,12 +330,12 @@ object RequestType {
 sealed trait RequestDestination extends js.Any
 
 object RequestDestination {
-  val empty = "".asInstanceOf[RequestDestination]
-  val document = "document".asInstanceOf[RequestDestination]
-  val sharedworker = "sharedworker".asInstanceOf[RequestDestination]
-  val subresource = "subresource".asInstanceOf[RequestDestination]
-  val unknown = "unknown".asInstanceOf[RequestDestination]
-  val worker = "worker".asInstanceOf[RequestDestination]
+  val empty: RequestDestination = "".asInstanceOf[RequestDestination]
+  val document: RequestDestination = "document".asInstanceOf[RequestDestination]
+  val sharedworker: RequestDestination = "sharedworker".asInstanceOf[RequestDestination]
+  val subresource: RequestDestination = "subresource".asInstanceOf[RequestDestination]
+  val unknown: RequestDestination = "unknown".asInstanceOf[RequestDestination]
+  val worker: RequestDestination = "worker".asInstanceOf[RequestDestination]
 }
 
 /** Fetch API's [[https://fetch.spec.whatwg.org/#requestmode RequestMode enum]]
@@ -344,10 +344,10 @@ object RequestDestination {
 sealed trait RequestMode extends js.Any
 
 object RequestMode {
-  val navigate = "navigate".asInstanceOf[RequestMode]
+  val navigate: RequestMode = "navigate".asInstanceOf[RequestMode]
   val `same-origin` = "same-origin".asInstanceOf[RequestMode]
   val `no-cors` = "no-cors".asInstanceOf[RequestMode]
-  val cors = "cors".asInstanceOf[RequestMode]
+  val cors: RequestMode = "cors".asInstanceOf[RequestMode]
 }
 
 /** Fetch APIs [[https://fetch.spec.whatwg.org/#requestcredentials RequestCredentials enum]]
@@ -356,9 +356,9 @@ object RequestMode {
 sealed trait RequestCredentials extends js.Any
 
 object RequestCredentials {
-  val omit = "omit".asInstanceOf[RequestCredentials]
+  val omit: RequestCredentials = "omit".asInstanceOf[RequestCredentials]
   val `same-origin` = "same-origin".asInstanceOf[RequestCredentials]
-  val include = "include".asInstanceOf[RequestCredentials]
+  val include: RequestCredentials = "include".asInstanceOf[RequestCredentials]
 }
 
 /** Fetch APIs [[https://fetch.spec.whatwg.org/#requestcache RequestCache enum]]
@@ -367,9 +367,9 @@ object RequestCredentials {
 sealed trait RequestCache extends js.Any
 
 object RequestCache {
-  val default = "default".asInstanceOf[RequestCache]
+  val default: RequestCache = "default".asInstanceOf[RequestCache]
   val `no-store` = "no-store".asInstanceOf[RequestCache]
-  val reload = "reload".asInstanceOf[RequestCache]
+  val reload: RequestCache = "reload".asInstanceOf[RequestCache]
   val `no-cache` = "no-cache".asInstanceOf[RequestCache]
   val `force-cache` = "force-cache".asInstanceOf[RequestCache]
   val `only-if-cached` = "only-if-cached".asInstanceOf[RequestCache]
@@ -381,9 +381,9 @@ object RequestCache {
 sealed trait RequestRedirect extends js.Any
 
 object RequestRedirect {
-  val follow = "follow".asInstanceOf[RequestRedirect]
-  val error = "error".asInstanceOf[RequestRedirect]
-  val manual = "manual".asInstanceOf[RequestRedirect]
+  val follow: RequestRedirect = "follow".asInstanceOf[RequestRedirect]
+  val error: RequestRedirect = "error".asInstanceOf[RequestRedirect]
+  val manual: RequestRedirect = "manual".asInstanceOf[RequestRedirect]
 }
 
 @js.native
@@ -392,10 +392,10 @@ sealed trait ResponseType extends js.Any
 /** see [[https://fetch.spec.whatwg.org/#responsetype]] of whatwg Fetch spec
   */
 object ResponseType {
-  val basic = "basic".asInstanceOf[ResponseType]
-  val cors = "cors".asInstanceOf[ResponseType]
-  val default = "default".asInstanceOf[ResponseType]
-  val error = "error".asInstanceOf[ResponseType]
-  val opaque = "opaque".asInstanceOf[ResponseType]
-  val opaqueredirect = "opaqueredirect".asInstanceOf[ResponseType]
+  val basic: ResponseType = "basic".asInstanceOf[ResponseType]
+  val cors: ResponseType = "cors".asInstanceOf[ResponseType]
+  val default: ResponseType = "default".asInstanceOf[ResponseType]
+  val error: ResponseType = "error".asInstanceOf[ResponseType]
+  val opaque: ResponseType = "opaque".asInstanceOf[ResponseType]
+  val opaqueredirect: ResponseType = "opaqueredirect".asInstanceOf[ResponseType]
 }

src/main/scala/org/scalajs/dom/IDBTypes.scala

@@ -22,21 +22,21 @@ object IDBTransactionMode {
     *
     * MDN
     */
-  val READ_ONLY = "readonly".asInstanceOf[IDBTransactionMode]
+  val READ_ONLY: IDBTransactionMode = "readonly".asInstanceOf[IDBTransactionMode]
 
   /** Allows any operation to be performed, including ones that delete and create object stores and indexes. This mode
     * is for updating the version number of transactions that were started using the setVersion() method of IDBDatabase
     * objects. Transactions of this mode cannot run concurrently with other transactions.
     *
     * MDN
     */
-  val VERSION_CHANGE = "versionchange".asInstanceOf[IDBTransactionMode]
+  val VERSION_CHANGE: IDBTransactionMode = "versionchange".asInstanceOf[IDBTransactionMode]
 
   /** Allows reading and writing of data in existing data stores to be changed.
     *
     * MDN
     */
-  val READ_WRITE = "readwrite".asInstanceOf[IDBTransactionMode]
+  val READ_WRITE: IDBTransactionMode = "readwrite".asInstanceOf[IDBTransactionMode]
 
 }
 
@@ -355,28 +355,28 @@ object IDBCursorDirection {
     *
     * MDN
     */
-  val PREV = "prev".asInstanceOf[IDBCursorDirection]
+  val PREV: IDBCursorDirection = "prev".asInstanceOf[IDBCursorDirection]
 
   /** The cursor shows all records, excluding duplicates. If multiple records exist with the same key, only the first
     * one iterated is retrieved. It starts at the upper bound of the key range and moves downwards.
     *
     * MDN
     */
-  val PREV_UNIQUE = "prevunique".asInstanceOf[IDBCursorDirection]
+  val PREV_UNIQUE: IDBCursorDirection = "prevunique".asInstanceOf[IDBCursorDirection]
 
   /** The cursor shows all records, including duplicates. It starts at the lower bound of the key range and moves
     * upwards (monotonically increasing in the order of keys).
     *
     * MDN
     */
-  val NEXT = "next".asInstanceOf[IDBCursorDirection]
+  val NEXT: IDBCursorDirection = "next".asInstanceOf[IDBCursorDirection]
 
   /** The cursor shows all records, excluding duplicates. If multiple records exist with the same key, only the first
     * one iterated is retrieved. It starts at the lower bound of the key range and moves upwards.
     *
     * MDN
     */
-  val NEXT_UNIQUE = "nextunique".asInstanceOf[IDBCursorDirection]
+  val NEXT_UNIQUE: IDBCursorDirection = "nextunique".asInstanceOf[IDBCursorDirection]
 }
 
 /** Same as IDBCursor with the value property.

src/main/scala/org/scalajs/dom/Stream.scala

@@ -15,23 +15,23 @@ object WriteableState {
   /** The stream’s internal queue is full; that is, the stream is exerting backpressure. Use .ready to be notified of
     * when the pressure subsides.
     */
-  val waiting = "waiting".asInstanceOf[WriteableState]
+  val waiting: WriteableState = "waiting".asInstanceOf[WriteableState]
 
   /** The stream’s internal queue is not full; call .write() until backpressure is exerted.
     */
-  val writable = "writable".asInstanceOf[WriteableState]
+  val writable: WriteableState = "writable".asInstanceOf[WriteableState]
 
   /** The stream’s .close() method has been called, and a command to close is in the queue or being processed by the
     * underlying sink; attempts to write will now fail.
     */
-  val closing = "closing".asInstanceOf[WriteableState]
+  val closing: WriteableState = "closing".asInstanceOf[WriteableState]
 
   /** The underlying sink has been closed; writing is no longer possible. */
-  val closed = "closed".asInstanceOf[WriteableState]
+  val closed: WriteableState = "closed".asInstanceOf[WriteableState]
 
   /** An error occurred interacting with the underlying sink or the stream has been aborted, so the stream is now dead.
     */
-  val errored = "errored".asInstanceOf[WriteableState]
+  val errored: WriteableState = "errored".asInstanceOf[WriteableState]
 }
 
 /** [[https://streams.spec.whatwg.org/#ws-class ¶4.2. Class WritableStream]] of whatwg Stream spec

src/main/scala/org/scalajs/dom/crypto/Crypto.scala

@@ -827,14 +827,14 @@ object Pbkdf2Params {
 trait KeyUsage extends js.Any
 
 object KeyUsage {
-  val encrypt = "encrypt".asInstanceOf[KeyUsage]
-  val decrypt = "decrypt".asInstanceOf[KeyUsage]
-  val sign = "sign".asInstanceOf[KeyUsage]
-  val verify = "verify".asInstanceOf[KeyUsage]
-  val deriveKey = "deriveKey".asInstanceOf[KeyUsage]
-  val deriveBits = "deriveBits".asInstanceOf[KeyUsage]
-  val wrapKey = "wrapKey".asInstanceOf[KeyUsage]
-  val unwrapKey = "unwrapKey".asInstanceOf[KeyUsage]
+  val encrypt: KeyUsage = "encrypt".asInstanceOf[KeyUsage]
+  val decrypt: KeyUsage = "decrypt".asInstanceOf[KeyUsage]
+  val sign: KeyUsage = "sign".asInstanceOf[KeyUsage]
+  val verify: KeyUsage = "verify".asInstanceOf[KeyUsage]
+  val deriveKey: KeyUsage = "deriveKey".asInstanceOf[KeyUsage]
+  val deriveBits: KeyUsage = "deriveBits".asInstanceOf[KeyUsage]
+  val wrapKey: KeyUsage = "wrapKey".asInstanceOf[KeyUsage]
+  val unwrapKey: KeyUsage = "unwrapKey".asInstanceOf[KeyUsage]
 }
 
 /** see [[http://www.w3.org/TR/WebCryptoAPI/#cryptokey-interface ¶13 CryptoKey interface]] in W3C doc
@@ -843,9 +843,9 @@ object KeyUsage {
 trait KeyType extends js.Any
 
 object KeyType {
-  val public = "public".asInstanceOf[KeyType]
-  val `private` = "private".asInstanceOf[KeyType]
-  val secret = "secret".asInstanceOf[KeyType]
+  val public: KeyType = "public".asInstanceOf[KeyType]
+  val `private`: KeyType = "private".asInstanceOf[KeyType]
+  val secret: KeyType = "secret".asInstanceOf[KeyType]
 }
 
 /** see [[http://www.w3.org/TR/WebCryptoAPI/#dfn-KeyFormat ¶14.2 Data Types]] in W3C spec
@@ -856,16 +856,16 @@ trait KeyFormat extends js.Any
 object KeyFormat {
 
   /** An unformatted sequence of bytes. Intended for secret keys. */
-  val raw = "raw".asInstanceOf[KeyFormat]
+  val raw: KeyFormat = "raw".asInstanceOf[KeyFormat]
 
   /** The DER encoding of the PrivateKeyInfo structure from RFC 5208. */
-  val pkcs8 = "pkcs8".asInstanceOf[KeyFormat]
+  val pkcs8: KeyFormat = "pkcs8".asInstanceOf[KeyFormat]
 
   /** The DER encoding of the SubjectPublicKeyInfo structure from RFC 5280. */
-  val spki = "spki".asInstanceOf[KeyFormat]
+  val spki: KeyFormat = "spki".asInstanceOf[KeyFormat]
 
   /** The key is a JsonWebKey dictionary encoded as a JavaScript object */
-  val jwk = "jwk".asInstanceOf[KeyFormat]
+  val jwk: KeyFormat = "jwk".asInstanceOf[KeyFormat]
 }
 
 //

src/main/scala/org/scalajs/dom/experimental/gamepad/package.scala

@@ -12,7 +12,7 @@ package object gamepad {
   implicit def toGamepad(navigator: dom.Navigator): GamepadNavigator =
     navigator.asInstanceOf[GamepadNavigator]
 
-  final val `unknown` = "".asInstanceOf[GamepadMappingType]
+  final val `unknown`: GamepadMappingType = "".asInstanceOf[GamepadMappingType]
 
-  final val `standard` = "standard".asInstanceOf[GamepadMappingType]
+  final val `standard`: GamepadMappingType = "standard".asInstanceOf[GamepadMappingType]
 }

src/main/scala/org/scalajs/dom/experimental/mediastream/MediaStream.scala

@@ -112,15 +112,15 @@ object MediaStreamTrackState {
   /** The track is active (the track's underlying media source is making a best-effort attempt to provide data in real
     * time). The output of a track in the live state can be switched on and off with the enabled attribute.
     */
-  val live = "live".asInstanceOf[MediaStreamTrackState]
+  val live: MediaStreamTrackState = "live".asInstanceOf[MediaStreamTrackState]
 
   /** The track has ended (the track's underlying media source is no longer providing data, and will never provide more
     * data for this track). Once a track enters this state, it never exits it.
     *
     * For example, a video track in a MediaStream ends if the user unplugs the USB web camera that acts as the track's
     * media source.
     */
-  val ended = "ended".asInstanceOf[MediaStreamTrackState]
+  val ended: MediaStreamTrackState = "ended".asInstanceOf[MediaStreamTrackState]
 }
 
 @js.native
@@ -406,15 +406,15 @@ object MediaDeviceKind {
 
   /** Represents an audio input device; for example a microphone.
     */
-  val audioinput = "audioinput".asInstanceOf[MediaDeviceKind]
+  val audioinput: MediaDeviceKind = "audioinput".asInstanceOf[MediaDeviceKind]
 
   /** Represents an audio output device; for example a pair of headphones.
     */
-  val audiooutput = "audiooutput".asInstanceOf[MediaDeviceKind]
+  val audiooutput: MediaDeviceKind = "audiooutput".asInstanceOf[MediaDeviceKind]
 
   /** Represents a video input device; for example a webcam.
     */
-  val videoinput = "videoinput".asInstanceOf[MediaDeviceKind]
+  val videoinput: MediaDeviceKind = "videoinput".asInstanceOf[MediaDeviceKind]
 }
 
 @js.native

src/main/scala/org/scalajs/dom/experimental/permissions/package.scala

@@ -14,9 +14,9 @@ package object permissions {
   sealed trait PermissionState extends js.Any
 
   object PermissionState {
-    val granted = "granted".asInstanceOf[PermissionState]
-    val denied = "denied".asInstanceOf[PermissionState]
-    val prompt = "prompt".asInstanceOf[PermissionState]
+    val granted: PermissionState = "granted".asInstanceOf[PermissionState]
+    val denied: PermissionState = "denied".asInstanceOf[PermissionState]
+    val prompt: PermissionState = "prompt".asInstanceOf[PermissionState]
   }
 
   trait PermissionStatus extends dom.EventTarget {
@@ -28,10 +28,10 @@ package object permissions {
   sealed trait PermissionName extends js.Any
 
   object PermissionName {
-    val geolocation = "geolocation".asInstanceOf[PermissionName]
-    val midi = "midi".asInstanceOf[PermissionName]
-    val notifications = "notifications".asInstanceOf[PermissionName]
-    val push = "push".asInstanceOf[PermissionName]
+    val geolocation: PermissionName = "geolocation".asInstanceOf[PermissionName]
+    val midi: PermissionName = "midi".asInstanceOf[PermissionName]
+    val notifications: PermissionName = "notifications".asInstanceOf[PermissionName]
+    val push: PermissionName = "push".asInstanceOf[PermissionName]
 
     val `persistent-storage` =
       "persistent-storage".asInstanceOf[PermissionName]