postinstall task for fixing sweetalert typings

gulpfile.js

@@ -8,13 +8,14 @@ const gulp = require('gulp'),
     zip = require('gulp-zip'),
     manifest = require('./src/manifest.json'),
     xmlpoke = require('gulp-xmlpoke'),
-    del = require('del');
+    del = require('del'),
+    fs = require('fs');
 
 const paths = {
     build: './build/',
     dist: './dist/',
     coverage: './coverage/',
-    npmDir: './node_modules/',
+    node_modules: './node_modules/',
     popupDir: './src/popup/',
     cssDir: './src/popup/css/'
 };
@@ -217,6 +218,13 @@ function copy(source, dest) {
     });
 }
 
+// ref: https://github.com/t4t5/sweetalert/issues/890
+function fixSweetAlert(cb) {
+    fs.writeFileSync(paths.node_modules + 'sweetalert/typings/sweetalert.d.ts',
+        'import swal, { SweetAlert } from "./core";export default swal;export as namespace swal;');
+    cb();
+}
+
 exports['dist:firefox'] = distFirefox;
 exports['dist:chrome'] = distChrome;
 exports['dist:opera'] = distOpera;
@@ -227,3 +235,5 @@ exports['ci:coverage'] = ciCoverage;
 exports.ci = ciCoverage;
 exports.webfonts = webfonts;
 exports.build = webfonts;
+exports.fixSweetAlert = fixSweetAlert;
+exports.postinstall = fixSweetAlert;