Simplify setup (#46)

src/lib/audio/audio-element-source.js

@@ -0,0 +1,15 @@
+import { writable } from 'svelte/store';
+
+// TODO: implement autoplay
+
+/**
+ * @typedef {Object} AudioSource
+ * @property {string} src - A path or URL to the audio file
+ * @property {number} start_at - The starting point of the audio
+ * @property {number} [playback_rate=1] - The playback speed of the audio
+ * @property {number} [volume=1] - The volume of the audio
+ * @property {boolean} [autoplay=false] - Whether the audio should play as soon as it's loaded
+ */
+
+/** @type {import('svelte/store').Writable<AudioSource | null>} */
+export const audio_element_source = writable(null);