Return formatting function as part of key generation

src/index.js

@@ -15,7 +15,7 @@ const addressFormats = new Map(Object.entries({
 class Vain extends Emitter {
 	constructor({keyFormat = 'wif', addressFormat = 'p2pkh', prefix}) {
 		super();
-		this.keyFormat = keyFormats.get(keyFormat);
+		this.generateKey = keyFormats.get(keyFormat);
 		this.addressFormat = addressFormats.get(addressFormat);
 
 		if (typeof prefix !== 'string' || prefix.length === 0) {
@@ -44,7 +44,7 @@ class Vain extends Emitter {
 			while (!found) {
 				attempts++;
 
-				keyData = this.keyFormat.generate();
+				keyData = this.generateKey();
 				address = this.addressFormat.derive(keyData.publicKey);
 
 				if (address.startsWith(this.prefix)) {
@@ -72,7 +72,7 @@ class Vain extends Emitter {
 				duration,
 				addressesPerSecond,
 				address,
-				...this.keyFormat.format(keyData)
+				...keyData.format()
 			};
 			this.emit('found', result);
 			resolve(result);

src/wif.js

@@ -1,9 +1,14 @@
 const bitcoin = require('bitcoinjs-lib');
 
-const wif = {};
+const wif = () => {
+	const keyPair = bitcoin.ECPair.makeRandom();
+	const {publicKey} = keyPair;
 
-wif.generate = bitcoin.ECPair.makeRandom;
+	const format = () => ({
+		wif: keyPair.toWIF()
+	});
 
-wif.format = keyPair => ({wif: keyPair.toWIF()});
+	return {publicKey, format};
+};
 
 module.exports = wif;