Support for Wechat applet (#874)

* Support for Wechat applet

* fix eslint and localStorage

* fix regenerator-runtime https://blog.csdn.net/xubaifu1997/article/details/90605683

* support file downloadAjax

* support liveQuery

* Add weapp.js to distribution

* support LocalDatastore

* Update readme and remove wx.Parse

Author: einsqing

.eslintrc.json

@@ -6,6 +6,9 @@
         "es6": true
     },
     "parser": "babel-eslint",
+    "globals": { 
+        "wx": true 
+    },
     "plugins": [
         "flowtype"
     ],

README.md

@@ -45,6 +45,13 @@ const AsyncStorage = require('react-native').AsyncStorage;
 Parse.setAsyncStorage(AsyncStorage);
 ```
 
+For WeChat miniprogram, include `'parse/weapp'`:
+```js
+// In a WeChat miniprogram
+const Parse = require('parse/weapp');
+```
+If you want to use a pre-compiled file, you can fetch it from [unpkg](https://unpkg.com). The development version is available at [https://unpkg.com/parse/dist/parse.weapp.js](https://unpkg.com/parse/dist/parse.weapp.js), and the minified production version is at [https://unpkg.com/parse/dist/parse.weapp.min.js](https://unpkg.com/parse/dist/parse.weapp.min.js).
+
 For TypeScript applications, install `'@types/parse'`:
 ```
 $ npm install @types/parse

build_releases.sh

@@ -8,10 +8,14 @@ rm -rf dist lib
 
 echo "Browser Release:"
 PARSE_BUILD=browser gulp compile
+echo "Weapp Release:"
+PARSE_BUILD=weapp gulp compile
 echo "Node.js Release:"
 PARSE_BUILD=node gulp compile
 echo "React Native Release:"
 PARSE_BUILD=react-native gulp compile
 echo "Bundling and minifying for CDN distribution:"
 gulp browserify
+gulp browserify-weapp
 gulp minify
+gulp minify-weapp

gulpfile.js

@@ -23,6 +23,9 @@ var PRESETS = {
   'browser': [["@babel/preset-env", {
     "targets": "> 0.25%, not dead"
   }], '@babel/preset-react'],
+  'weapp': [["@babel/preset-env", {
+    "targets": "> 0.25%, not dead"
+  }], '@babel/preset-react'],
   'node': [["@babel/preset-env", {
     "targets": { "node": "8" }
   }]],
@@ -31,8 +34,10 @@ var PRESETS = {
 var PLUGINS = {
   'browser': [transformRuntime, '@babel/plugin-transform-flow-comments', '@babel/plugin-proposal-class-properties', 'inline-package-json',
     ['transform-inline-environment-variables', {'exclude': ['SERVER_RENDERING']}]],
+  'weapp': [transformRuntime, '@babel/plugin-transform-flow-comments', '@babel/plugin-proposal-class-properties', 'inline-package-json',
+    ['transform-inline-environment-variables', {'exclude': ['SERVER_RENDERING']}]],
   'node': ['@babel/plugin-transform-flow-comments', 'inline-package-json', 'transform-inline-environment-variables'],
-  'react-native': ['@babel/plugin-transform-flow-comments', 'inline-package-json', 'transform-inline-environment-variables'],
+  'react-native': ['@babel/plugin-transform-flow-comments', 'inline-package-json', 'transform-inline-environment-variables']
 };
 
 var DEV_HEADER = (
@@ -90,6 +95,25 @@ gulp.task('browserify', function(cb) {
     .pipe(gulp.dest('./dist'));
 });
 
+
+gulp.task('browserify-weapp', function(cb) {
+  var stream = browserify({
+    builtins: ['_process', 'events'],
+    entries: 'lib/weapp/Parse.js',
+    standalone: 'Parse'
+  })
+    .exclude('xmlhttprequest')
+    .ignore('_process')
+    .bundle();
+  stream.on('end', () => {
+    cb();
+  });
+  return stream.pipe(source('parse.weapp.js'))
+    .pipe(derequire())
+    .pipe(insert.prepend(DEV_HEADER))
+    .pipe(gulp.dest('./dist'));
+});
+
 gulp.task('minify', function() {
   return gulp.src('dist/parse.js')
     .pipe(uglify())
@@ -98,6 +122,14 @@ gulp.task('minify', function() {
     .pipe(gulp.dest('./dist'))
 });
 
+gulp.task('minify-weapp', function() {
+  return gulp.src('dist/parse.weapp.js')
+    .pipe(uglify())
+    .pipe(insert.prepend(FULL_HEADER))
+    .pipe(rename({ extname: '.min.js' }))
+    .pipe(gulp.dest('./dist'))
+});
+
 gulp.task('watch', function() {
   return watch('src/*.js', { ignoreInitial: false, verbose: true })
     .pipe(babel({