Move everything to src folder... it had to happen

src/m2d/converters/emoji.js

@@ -0,0 +1,57 @@
+// @ts-check
+
+const assert = require("assert").strict
+const Ty = require("../../types")
+
+const passthrough = require("../../passthrough")
+const {sync, select} = passthrough
+
+/**
+ * @param {string} input
+ * @param {string | null | undefined} shortcode
+ * @returns {string?}
+ */
+function encodeEmoji(input, shortcode) {
+	let discordPreferredEncoding
+	if (input.startsWith("mxc://")) {
+		// Custom emoji
+		let row = select("emoji", ["emoji_id", "name"], {mxc_url: input}).get()
+		if (!row && shortcode) {
+			// Use the name to try to find a known emoji with the same name.
+			const name = shortcode.replace(/^:|:$/g, "")
+			row = select("emoji", ["emoji_id", "name"], {name: name}).get()
+		}
+		if (!row) {
+			// We don't have this emoji and there's no realistic way to just-in-time upload a new emoji somewhere.
+			// Sucks!
+			return null
+		}
+		// Cool, we got an exact or a candidate emoji.
+		discordPreferredEncoding = encodeURIComponent(`${row.name}:${row.emoji_id}`)
+	} else {
+		// Default emoji
+		// https://github.com/discord/discord-api-docs/issues/2723#issuecomment-807022205 ????????????
+		const encoded = encodeURIComponent(input)
+		const encodedTrimmed = encoded.replace(/%EF%B8%8F/g, "")
+
+		const forceTrimmedList = [
+			"%F0%9F%91%8D", // 👍
+			"%F0%9F%91%8E", // 👎️
+			"%E2%AD%90", // ⭐
+			"%F0%9F%90%88", // 🐈
+			"%E2%9D%93", // ❓
+			"%F0%9F%8F%86", // 🏆️
+			"%F0%9F%93%9A", // 📚️
+		]
+
+		discordPreferredEncoding =
+			( forceTrimmedList.includes(encodedTrimmed) ? encodedTrimmed
+			: encodedTrimmed !== encoded && [...input].length === 2 ? encoded
+			: encodedTrimmed)
+
+		console.log("add reaction from matrix:", input, encoded, encodedTrimmed, "chosen:", discordPreferredEncoding)
+	}
+	return discordPreferredEncoding
+}
+
+module.exports.encodeEmoji = encodeEmoji