feat: add cjs and esm modules

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 .nyc_output
+coverage

index.cjs

@@ -0,0 +1,44 @@
+// https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki
+// bitcoin:<address>[?amount=<amount>][?label=<label>][?message=<message>]
+
+const querystring = require('query-string').default
+
+function decode (uri, urnScheme) {
+  urnScheme = urnScheme || 'bitcoin'
+
+  const urnSchemeActual = uri.slice(0, urnScheme.length).toLowerCase()
+  if (urnSchemeActual !== urnScheme ||
+    uri.charAt(urnScheme.length) !== ':'
+  ) throw new Error('Invalid BIP21 URI: ' + uri)
+
+  const split = uri.indexOf('?')
+  const address = uri.slice(urnScheme.length + 1, split === -1 ? undefined : split)
+  const query = split === -1 ? '' : uri.slice(split + 1)
+  const options = querystring.parse(query)
+
+  if (options.amount) {
+    options.amount = Number(options.amount)
+    if (!isFinite(options.amount)) throw new Error('Invalid amount')
+    if (options.amount < 0) throw new Error('Invalid amount')
+  }
+
+  return { address, options }
+}
+
+function encode (address, options, urnScheme) {
+  options = options || {}
+  const scheme = urnScheme || 'bitcoin'
+  const query = querystring.stringify(options)
+
+  if (options.amount) {
+    if (!isFinite(options.amount)) throw new TypeError('Invalid amount')
+    if (options.amount < 0) throw new TypeError('Invalid amount')
+  }
+
+  return scheme + ':' + address + (query ? '?' : '') + query
+}
+
+module.exports = {
+  decode,
+  encode
+}

index.d.ts

@@ -0,0 +1,10 @@
+export type Bip21Options = {
+    amount?: number;
+    label?: string;
+    message?: string;
+}
+export function decode(uri: string, urnScheme?: string): {
+    address: string;
+    options: Bip21Options
+};
+export function encode(address: string, options?: Bip21Options, urnScheme?: string): string;

index.js

@@ -1,9 +1,9 @@
 // https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki
 // bitcoin:<address>[?amount=<amount>][?label=<label>][?message=<message>]
 
-const qs = require('qs')
+import querystring from 'query-string'
 
-function decode (uri, urnScheme) {
+export function decode (uri, urnScheme) {
   urnScheme = urnScheme || 'bitcoin'
   const urnSchemeActual = uri.slice(0, urnScheme.length).toLowerCase()
   if (urnSchemeActual !== urnScheme ||
@@ -13,7 +13,7 @@ function decode (uri, urnScheme) {
   const split = uri.indexOf('?')
   const address = uri.slice(urnScheme.length + 1, split === -1 ? undefined : split)
   const query = split === -1 ? '' : uri.slice(split + 1)
-  const options = qs.parse(query)
+  const options = querystring.parse(query)
 
   if (options.amount) {
     options.amount = Number(options.amount)
@@ -24,10 +24,10 @@ function decode (uri, urnScheme) {
   return { address, options }
 }
 
-function encode (address, options, urnScheme) {
+export function encode (address, options, urnScheme) {
   options = options || {}
   const scheme = urnScheme || 'bitcoin'
-  const query = qs.stringify(options)
+  const query = querystring.stringify(options)
 
   if (options.amount) {
     if (!isFinite(options.amount)) throw new TypeError('Invalid amount')
@@ -36,8 +36,3 @@ function encode (address, options, urnScheme) {
 
   return scheme + ':' + address + (query ? '?' : '') + query
 }
-
-module.exports = {
-  decode,
-  encode
-}