Feat/zh/refactor shim

[mzxyz]

1. Solved part of the issue 111 : enable sr25519.

2. Refactor shim: using babel-rewrite to replace rn-nodeify

3. Fix Issue 141

Have test on real device, mnemonicGenerate works as expect, but there has some UI interaction issues at create account page, should open another issue for that.

[0xthreebody]

Hey, @huanday Thanks for your pioneering efforts. If you need any help, let me know here.

[mzxyz]

@jiangfuyao I forgot to set a reviewer for this PR, could you help review and merge this?

[0xthreebody]

@huanday Yeap, thansk, I will to reviewer it.

[0xthreebody]

@huanday got error:

[mzxyz]

@jiangfuyao I didn't got the above error. I do some updates on the codebase. Could you checkout the latest code and delete node_modules and run yarn install again.

I also test yarn run bundle-ios all things should work properly now, thanks

[0xthreebody]

The code is working now, Nice. Have two questions:

• Did you have the issue: running the app, the custom keyboard will don't work, auto exit.
• What's the way to support Sr25519 on UI, what's need to fix?

[mzxyz]

@jiangfuyao

• For the first question, just look into previous commit, the issue was introduced by this commit, fixed here

• If you mean Create account can choose Sr25519 or ed25519, just add another inputPicker to enable user to choose which one to generate keyPair. For codebase init keyring like new Keyring({ type: 'sr25519 | ed25519' })

[0xthreebody]

@huanday This fixed CustomKeyboard auto exit. I tested in Android before, so iOS have issue. The iOS lose Auto focus function, and other pages(staking/transfer/voting) can't to show the system keyboard, which not is password input.

[mzxyz]

@jiangfuyao Can open another issue to address CustomKeyboard problem.

Update using sr25519 to generate keys. Need to run yarn install to update the modules after checkout the codebase.

Also using native api to generate random numbers in this commit, it may solve issue 120

[0xthreebody]

@huanday Last time I tested is ok, but now, got error:

transform[stdout]: <--- Last few GCs ---> with --max_old_space_size=4096.

[mzxyz]

@jiangfuyao Could you try to run yarn start manually then just open you app and reload the bundle. There has an issue with the default configuration for metro bundler which doesn't have env param --max_old_space_size=4096

[mzxyz]

I have config bundle generation before, like this:

But for my research, it only processed when runing react-native bundle or generate released build.

We can fix it by hacking the code inside react-native-xcode.sh, changing [ -z "$NODE_ARGS" ] && export NODE_ARGS="" to [ -z "$NODE_ARGS" ] && export NODE_ARGS="--max_old_space_size=4096"