Stronger typing for convo messages (#493)

following
#457 (comment)
cc @mishig25

---------

Co-authored-by: Simon Brandeis <33657802+SBrandeis@users.noreply.github.com>

Author: Wauplin

packages/widgets/src/lib/components/InferenceWidget/shared/WidgetOutputConvo/WidgetOutputConvo.svelte

@@ -2,13 +2,11 @@
 	import { afterUpdate } from "svelte";
 
 	import { isFullyScrolled, scrollToMax } from "../../../../utils/ViewUtils.js";
+	import type { ConversationMessage } from "../../shared/types.js";
 	import WidgetOutputConvoBubble from "../WidgetOuputConvoBubble/WidgetOutputConvoBubble.svelte";
 
 	export let modelId: string;
-	export let messages: Array<{
-		role: string;
-		content: string;
-	}>;
+	export let messages: ConversationMessage[];
 
 	let wrapperEl: HTMLElement;
 

packages/widgets/src/lib/components/InferenceWidget/shared/types.ts

@@ -71,3 +71,8 @@ export interface ImageSegment {
 	imgData?: ImageData;
 	bitmap?: ImageBitmap;
 }
+
+export interface ConversationMessage {
+	role: "user" | "assistant" | "system";
+	content: string;
+}

packages/widgets/src/lib/components/InferenceWidget/widgets/ConversationalWidget/ConversationalWidget.svelte

@@ -4,7 +4,7 @@
 	import { Template } from "@huggingface/jinja";
 	import type { SpecialTokensMap, TokenizerConfig, WidgetExampleTextInput } from "@huggingface/tasks";
 	import { SPECIAL_TOKENS_ATTRIBUTES } from "@huggingface/tasks";
-
+	import type { ConversationMessage } from "../../shared/types.js";
 	import WidgetOutputConvo from "../../shared/WidgetOutputConvo/WidgetOutputConvo.svelte";
 	import WidgetQuickInput from "../../shared/WidgetQuickInput/WidgetQuickInput.svelte";
 	import WidgetWrapper from "../../shared/WidgetWrapper/WidgetWrapper.svelte";
@@ -22,13 +22,8 @@
 
 	$: isDisabled = $widgetStates?.[model.id]?.isDisabled;
 
-	interface Message {
-		role: string;
-		content: string;
-	}
-
 	let computeTime = "";
-	let messages: Message[] = [];
+	let messages: ConversationMessage[] = [];
 	let error: string = "";
 	let isLoading = false;
 	let modelLoading = {
@@ -150,7 +145,7 @@
 		}
 	}
 
-	function parseOutput(body: unknown, chat: Message[]): Message[] {
+	function parseOutput(body: unknown, chat: ConversationMessage[]): ConversationMessage[] {
 		if (Array.isArray(body) && body.length) {
 			const text = body[0]?.generated_text ?? "";