Add heatsync and support hot reloading

stdin.js

@@ -0,0 +1,47 @@
+const repl = require("repl")
+const util = require("util")
+
+const passthrough = require("./passthrough")
+const { discord, config, sync } = passthrough
+
+const extraContext = {}
+
+setImmediate(() => { // assign after since old extraContext data will get removed
+	if (!passthrough.repl) {
+		const cli = repl.start({ prompt: "", eval: customEval, writer: s => s })
+		Object.assign(cli.context, extraContext, passthrough)
+		passthrough.repl = cli
+	} else Object.assign(passthrough.repl.context, extraContext)
+	// @ts-expect-error Says exit isn't assignable to a string
+	sync.addTemporaryListener(passthrough.repl, "exit", () => process.exit())
+})
+
+/**
+ * @param {string} input
+ * @param {import("vm").Context} _context
+ * @param {string} _filename
+ * @param {(err: Error | null, result: unknown) => unknown} callback
+ */
+async function customEval(input, _context, _filename, callback) {
+	let depth = 0
+	if (input === "exit\n") return process.exit()
+	if (input.startsWith(":")) {
+		const depthOverwrite = input.split(" ")[0]
+		depth = +depthOverwrite.slice(1)
+		input = input.slice(depthOverwrite.length + 1)
+	}
+	let result
+	try {
+		result = await eval(input)
+		const output = util.inspect(result, false, depth, true)
+		return callback(null, output)
+	} catch (e) {
+		return callback(null, util.inspect(e, true, 100, true))
+	}
+}
+
+sync.events.once(__filename, () => {
+	for (const key in extraContext) {
+		delete passthrough.repl.context[key]
+	}
+})