It's possible to reset IJSEngine state?

[coader]

I have a script snippet, should be executed many times
so i precompile it at first, but every time execute, the engine still keep last state,
so get error: redeclared

code just like this:
'use strict'; const x=1+2+3+4; let y=2; function run( ){ return x*x; }

[Taritsyn]

It's impossible. Rewrite your code as a function with parameters and execute it once. Then call the function with different parameters.

[Taritsyn]

Although you can try manually removing a x, y and run global variables.

[coader]

got it, tks

[coader]

sorry for this issue, still another question, as it execute many times, so it's threadsafe for compile and execute?

[Taritsyn]

Yes, these operations are threadsafe. There is even a test to check this.