a bit of typing

src/bytebeat.ts

@@ -1,6 +1,7 @@
-import { f32ToRound10, isPlainObject, Song } from "./common.ts";
+import { f32ToRound10, isPlainObject, Song, SongMode } from "./common.ts";
 import { elements as elementsPromise } from "./dom.ts";
 import { fromUrlData, setUrlData } from "./url/mod.ts";
+import type { EditorView } from "@codemirror/view";
 
 const searchParams = new URLSearchParams(location.search);
 
@@ -26,7 +27,10 @@ let byteSample = 0;
 
 let isPlaying = false;
 
-let songData = {
+let songData: {
+	sampleRate: number,
+	mode: SongMode,
+} = {
 	sampleRate: 8000, // float32
 	mode: "Bytebeat",
 };
@@ -37,7 +41,7 @@ let timeUnit = null;
 
 let animationFrameId = null;
 
-let codeEditor = null;
+let codeEditor: HTMLTextAreaElement | EditorView | null = null;
 
 let elements = null; // TODO remove
 
@@ -236,9 +240,9 @@ function getCodeEditorText(): string {
 		return codeEditor.state.doc.toString();
 	}
 }
-function setCodeEditorText(value: string) {
+function setCodeEditorText(value?: string) {
 	if (codeEditor instanceof Element) {
-		codeEditor.value = value;
+		codeEditor.value = value as string;
 	} else {
 		codeEditor.dispatch({
 			changes: { from: 0, to: codeEditor.state.doc.length, insert: value },
@@ -296,7 +300,7 @@ function getSong(): Song {
 	return { code: getCodeEditorText(), ...songData };
 }
 
-function setSong(songData?: Song, play = true) {
+function setSong(songData?: Partial<Song>, play = true) {
 	let code, sampleRate, mode;
 	if (songData) {
 		({ code, sampleRate, mode } = songData);

src/library/load.ts

@@ -10,12 +10,12 @@ function stripInlineEntryToSong(entry: Readonly<EntryBase & InlineEntry>, codeTy
 	const { sampleRate, mode } = entry;
 	return { code: entry[codeType], sampleRate, mode };
 }
-function createByteSnippet(text: string, onclick: () => void) {
+function createByteSnippet(text: string | undefined, onclick: () => void) {
 	const interactElem = document.createElement("button");
 	const codeElem = document.createElement("code");
 	interactElem.title = "Click to play this code";
 	interactElem.className = "code-button";
-	codeElem.innerText = text;
+	codeElem.innerText = text as string;
 	interactElem.addEventListener("click", onclick);
 	interactElem.append(codeElem);
 	return interactElem;