Add API to replace Login component renderer

packages/element-web-module-api/element-web-module-api.api.md

@@ -7,6 +7,7 @@
 import { ComponentType } from 'react';
 import { JSX } from 'react';
 import { ModuleApi } from '@matrix-org/react-sdk-module-api';
+import { ReactNode } from 'react';
 import { Root } from 'react-dom/client';
 import { RuntimeModule } from '@matrix-org/react-sdk-module-api';
 
@@ -109,10 +110,29 @@ export interface ConfigApi {
 
 // @alpha
 export interface CustomComponentsApi {
+    registerLoginComponent(renderer: CustomLoginRenderFunction): void;
     registerMessageRenderer(eventTypeOrFilter: string | ((mxEvent: MatrixEvent) => boolean), renderer: CustomMessageRenderFunction, hints?: CustomMessageRenderHints): void;
     registerRoomPreviewBar(renderer: CustomRoomPreviewBarRenderFunction): void;
 }
 
+// @alpha
+export type CustomLoginComponentProps = {
+    serverConfig: CustomLoginComponentPropsServerConfig;
+    fragmentAfterLogin?: string;
+    children?: ReactNode;
+    onLoggedIn(data: AccountAuthInfo): void;
+    onServerConfigChange(config: CustomLoginComponentPropsServerConfig): void;
+};
+
+// @alpha
+export interface CustomLoginComponentPropsServerConfig {
+    hsName: string;
+    hsUrl: string;
+}
+
+// @alpha
+export type CustomLoginRenderFunction = ExtendablePropsRenderFunction<CustomLoginComponentProps>;
+
 // @alpha
 export type CustomMessageComponentProps = {
     mxEvent: MatrixEvent;
@@ -171,6 +191,11 @@ export interface DirectoryCustomisations {
     requireCanonicalAliasAccessToPublish?(): boolean;
 }
 
+// @alpha
+export type ExtendablePropsRenderFunction<BaseProps> = <P extends BaseProps>(
+props: P,
+originalComponent: (props: P) => JSX.Element) => JSX.Element;
+
 // @alpha
 export interface ExtrasApi {
     getVisibleRoomBySpaceKey(spaceKey: string, cb: () => string[]): void;
@@ -476,4 +501,3 @@ export interface WidgetVariablesCustomisations {
 // (No @packageDocumentation comment for this package)
 
 ```
-