Add new enum for verification methods. (#4129)

* Define constants for the verification methods.

* Remove some confusing references to the *old* `VerificationMethod`

src/types.ts

@@ -25,3 +25,33 @@ export type * from "./@types/media";
 export * from "./@types/membership";
 export type * from "./@types/event";
 export type * from "./@types/state_events";
+
+/** The different methods for device and user verification */
+export enum VerificationMethod {
+    /** Short authentication string (emoji or decimals).
+     *
+     * @see https://spec.matrix.org/v1.9/client-server-api/#short-authentication-string-sas-verification
+     */
+    Sas = "m.sas.v1",
+
+    /**
+     * Verification by showing a QR code which is scanned by the other device.
+     *
+     * @see https://spec.matrix.org/v1.9/client-server-api/#qr-codes
+     */
+    ShowQrCode = "m.qr_code.show.v1",
+
+    /**
+     * Verification by scanning a QR code that is shown by the other device.
+     *
+     * @see https://spec.matrix.org/v1.9/client-server-api/#qr-codes
+     */
+    ScanQrCode = "m.qr_code.scan.v1",
+
+    /**
+     * Verification by confirming that we have scanned a QR code.
+     *
+     * @see https://spec.matrix.org/v1.9/client-server-api/#qr-codes
+     */
+    Reciprocate = "m.reciprocate.v1",
+}