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

src/d2m/converters/lottie.js

@@ -0,0 +1,48 @@
+// @ts-check
+
+const assert = require("assert")
+const stream = require("stream")
+const {PNG} = require("@cloudrac3r/pngjs")
+
+const SIZE = 160 // Discord's display size on 1x displays is 160
+
+/**
+ * @typedef RlottieWasm
+ * @prop {(string) => boolean} load load lottie data from string of json
+ * @prop {() => number} frames get number of frames
+ * @prop {(frameCount: number, width: number, height: number) => Uint8Array} render render lottie data to bitmap
+ */
+
+const Rlottie = (async () => {
+	const Rlottie = require("./rlottie-wasm.js")
+	await new Promise(resolve => Rlottie.onRuntimeInitialized = resolve)
+	return Rlottie
+})()
+
+/**
+ * @param {string} text
+ * @returns {Promise<import("stream").Readable>}
+ */
+async function convert(text) {
+	const r = await Rlottie
+	/** @type RlottieWasm */
+	const rh = new r.RlottieWasm()
+	const status = rh.load(text)
+	assert(status, `Rlottie unable to load ${text.length} byte data file.`)
+	const rendered = rh.render(0, SIZE, SIZE)
+	let png = new PNG({
+		width: SIZE,
+		height: SIZE,
+		bitDepth: 8, // 8 red + 8 green + 8 blue + 8 alpha
+		colorType: 6, // RGBA
+		inputColorType: 6, // RGBA
+		inputHasAlpha: true,
+	})
+	png.data = Buffer.from(rendered)
+	// png.pack() is a bad stream and will throw away any data it sends if it's not connected to a destination straight away.
+	// We use Duplex.from to convert it into a good stream.
+	return stream.Duplex.from(png.pack())
+}
+
+module.exports.convert = convert
+module.exports.SIZE = SIZE