Add session, client and server with the promise result API

src/defs/index.ts

@@ -0,0 +1,19 @@
+import { cmds, cmdsById } from './commands.ts';
+import { consts, constsById } from './constants.ts';
+import { encodings } from './encodings.ts';
+import { errors, errorsById } from './errors.ts';
+import { tlvs, tlvsById } from './tlvs.ts';
+import { types } from './types.ts';
+
+export const defs = {
+	cmds,
+	cmdsById,
+	consts,
+	constsById,
+	encodings,
+	errors,
+	errorsById,
+	tlvs,
+	tlvsById,
+	types,
+};

src/defs/types.ts

@@ -24,6 +24,15 @@ export type WireType<T extends ParamValue = ParamValue> = {
 	write: (value: ParamValue, buffer: Buffer, offset: number) => VoidResult;
 };
 
+/** Renders a parameter as text without ever falling back to "[object Object]". */
+export function paramText(value: ParamValue | undefined): string {
+	if (typeof value === 'string') return value;
+	if (typeof value === 'number') return value.toString();
+	if (Buffer.isBuffer(value)) return value.toString('ascii');
+
+	return '';
+}
+
 function outOfRange(buffer: Buffer, offset: number, needed: number): Error | undefined {
 	if (offset < 0 || needed < 0 || offset + needed > buffer.length) {
 		return new Error(