Serialize Uint8Arrays better

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 1.3.0
• Platform / OS version: macOS Sierra
• URLs (if applicable): …
• Node.js version: master

What steps will reproduce the problem?

Please include code that reproduces the issue.

1. Open a new page with puppeteer
2. Run page.evaluate(() => new Uint8Array(1024 * 1024 * 10)

What is the expected result?

Puppeteer takes over 20 seconds to serialize/deserialize 10MB and the resulting object is not a Uint8Array.

What happens instead?

A Uint8Array should be returned and it should take a reasonable amount of time (single-digit miliseconds tops and not seconds).

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This basically would require inspecting objects returned from evaluate, detecting they’re Uint8Arrays and then serializing them differently.

[benjamingr]

why are you using JSON - I I though you were dealing with array buffer and binary data iin which case could you just write the buffer directly and consume it as array buffer in the browser ?

Yes of course I was just giving an example - my real code writes a node stream and reads it as a stream on the other side using fetch and even backpressure works (I process as quickly as I can on the client and read).

[aslushnikov]

@aslushnikov please consider reopening this issue.

Sure!

My use case for moving a lot of data is very real, it’s not farfetched at all and I believe it’s pretty common.

Feel free to send a PR