Looking for off-line Javascript bitcoin miner code

[darius2020]

Hi,

Looking for off-line Javascript bitcoin miner code.

Trying to develop one on my own unfortunately it looks complicated to build valid block header off-line.

Any idea ?

I run today Javascript sha-256 algorithm but looking for
fully developed   Bitcoin miner in Javascript for download to be run in off-line mode
I need input data from history of hashed blocks

(database of block headers)

Any idea, any help ?