adventure-yunfei fix: wrong overwritting of not writable Unit8Array.from

[adventure-yunfei]

Uint8Array defined an unwritable from property, which causes overwritting operation after changing Buffer.__proto__ fails and break script execution.

e.g. failing to assign ".from" property in Chrome:

When use buffer with webpack, everything after Buffer.from = ... just gone.

And e.g. failing to require buffer in node@4

We should move "Buffer.from" assignment forward to avoid this error.

Note that this may not be reproducible on all browser. In some browsers (or node@6) Uint8Array doesn't have 'from', or defines a writable 'from' property.

[feross]

What version of Chrome are you using? I've never seen this error.

[feross]

I suppose this can't do any harm, so why not?

[feross]

Released as 5.0.2

[adventure-yunfei]

@feross I've printed out chrome version (which is 50.0.2661.102), and node version (which is 4.4.4). On these platforms, Object.getOwnPropertyDescriptor(Uint8Array.__proto__, 'from') will get a non-writable descriptor.

(And I've also tested latest chrome@55.0 and node@6.9.1 which shows it's writable instead.)

[feross]

@adventure-yunfei Sounds good. Thanks for testing!