sample project does not compile

[bleonard]

ran this : react-native bundle --minify

Building package...
transforming [========================================] 100% 335/335
Build complete
/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/promise/lib/done.js:10
      throw err;
      ^

Error: Error while minifying JS
Transformed code line: "for(var _callback of this[listenersKey]) {"
Module name (best guess): realm/realm.js
Unexpected token name «of», expected punc «;» (line: 54365, col: 18, pos: 998341)

Error
    at new JS_Parse_Error (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:1508:18)
    at js_error (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:1516:11)
    at croak (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2008:9)
    at token_error (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2016:9)
    at expect_token (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2029:9)
    at expect (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2032:36)
    at regular_for (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2262:9)
    at for_ (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2258:16)
    at eval (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2140:24)
    at eval (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2055:24)
    at block_ (eval at <anonymous> (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/uglify-js/tools/node.js:22:1), <anonymous>:2335:20)
    at Bundle.getMinifiedSourceAndMap (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/packager/react-packager/src/Bundler/Bundle.js:150:13)
    at Bundle.getSource (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/packager/react-packager/src/Bundler/Bundle.js:101:19)
    at /Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/local-cli/bundle.js:55:36
    at tryCallOne (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/promise/lib/core.js:37:12)
    at /Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/promise/lib/core.js:103:15
    at flush (/Users/brian/github/realm-js/examples/ReactExample/node_modules/react-native/node_modules/promise/node_modules/asap/raw.js:50:29)

[bleonard]

i believe the version react native puts on the phone doesn't support of yet.

[appden]

Looks like a known bug with React Native (facebook/react-native#1499). I'll check into a workaround.

[appden]

It fails because they haven't configured babel to transform for of loops, which works at least on iOS 9, but it makes UglifyJS choke. They reopened the issue at my request.

[bleonard]

so we are supporting iOS 8. Is realm going to work with that. Are you sure you shouldn't just use in for better support?

[alazier]

Yeah, we should probably switch back to using in until of is officially supported.

[kristiandupont]

..or we could reconsider lodash. I know you are not fans but I have to say that little lib has made js development more enjoyable for me many times. You can even require it on a per-feature basis so it doesn't add too much overhead.

[appden]

@bleonard in iterates over keys whereas of iterates of values. It turns out that iOS 8 actually does support for-of loops, but since --minify uses UglifyJS (which does not), I removed our uses of for of loops in favor of forEach in PR #125.

[bleonard]

thanks.