Add support for async parse in loader

index.test.js

@@ -55,7 +55,7 @@ tape('config', test => {
 		t('Hello World');
 	}, /No translation found/);
 	config({
-		log: function() {
+		log: function () {
 			throw new Error('CustomError');
 		}
 	});
@@ -73,12 +73,8 @@ tape('config', test => {
 });
 
 tape('loader', test => {
-	let expected = `var nano = require('nano-i18n');
-var res = {};
-res[nano.k\`Hello, $\{'World'}\`] = nano.v\`Salut, $\{0}\`;
-res[nano.k\`Simple String\`] = nano.v\`Șir Simplu\`;
-module.exports = res;`;
-
+	let expected =
+		"var nano = require('nano-i18n'); \nvar res = {};\nres[nano.k`Hello, ${'World'}`] = nano.v`Salut, ${0}`;\nres[nano.k`Simple String`] = nano.v`Șir Simplu`;\nmodule.exports = res;";
 	test.equal(
 		loader([
 			{ key: "Hello, ${'World'}", val: 'Salut, ${0}' },

loader.js

@@ -1,18 +1,25 @@
 /* 
 	Webpack loader
 */
-module.exports = function(text) {
+const out = obj => `var nano = require('nano-i18n'); 
+var res = {};
+${obj.map(entry => `res[nano.k\`${entry.key}\`] = nano.v\`${entry.val}\`;`).join('\n')}
+module.exports = res;`;
+
+module.exports = function (text) {
 	if (typeof this.cacheable === 'function') {
 		this.cacheable();
 	}
-
-	let obj = text;
-	if (typeof this.query === 'object' && typeof this.query.parse === 'function') {
-		obj = this.query.parse(text);
+	let p =
+		typeof this.query === 'object' && typeof this.query.parse === 'function'
+			? this.query.parse(text)
+			: text;
+	if (typeof this.async === 'function') {
+		let cb = this.async();
+		Promise.resolve(p).then(obj => {
+			cb(null, out(obj));
+		});
+	} else {
+		return out(p);
 	}
-
-	return `var nano = require('nano-i18n');
-var res = {};
-${obj.map(entry => `res[nano.k\`${entry.key}\`] = nano.v\`${entry.val}\`;`).join('\n')}
-module.exports = res;`;
 };