Write full types and fix related bugs

Also fixes #4.

src/lib/structures/TimelineChild.js

@@ -1,41 +1,16 @@
 const config = require("../../../config")
 const {proxyImage} = require("../utils/proxyurl")
 const collectors = require("../collectors")
+const TimelineBaseMethods = require("./TimelineBaseMethods")
 require("../testimports")(collectors)
 
-class TimelineChild {
+class TimelineChild extends TimelineBaseMethods {
 	/**
-	 * @param {import("../types").GraphChild} data
+	 * @param {import("../types").GraphChildAll} data
 	 */
 	constructor(data) {
+		super()
 		this.data = data
-		this.proxyDisplayURL = proxyImage(this.data.display_url)
-	}
-
-	/**
-	 * @param {number} size
-	 */
-	getSuggestedResource(size) {
-		let found = null
-		for (const tr of this.data.display_resources) {
-			found = tr
-			if (tr.config_width >= size) break
-		}
-		found = proxyImage(found, size)
-		return found
-	}
-
-	getSrcset() {
-		return this.data.display_resources.map(tr => {
-			const p = new URLSearchParams()
-			p.set("width", String(tr.config_width))
-			p.set("url", tr.src)
-			return `/imageproxy?${p.toString()} ${tr.config_width}w`
-		}).join(", ")
-	}
-
-	getAlt() {
-		return this.data.accessibility_caption || "No image description available."
 	}
 }