Nginx NJS fs.writeFileSync is atomic writing and race condition prevention ?

[HENG]

Hello:

I am new to Nginx NJS, and I want to write a website with NJS.

I want to write a simple JSON database with NJS fs.writeFileSync ,just like
Node.js LowDB.

but I have no idea . Does NJS fs.writeFileSync is atomic writing and race
condition prevention ?

If NJS fs.writeFileSync is NOT atomic writing, it can NOT be treate as a
normal database file write.

Thank you !

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Heng
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