Did you update Chrome App version last week?

nope, minification does not help.

I mean, turn minification off.

If I upload the code you posted to https://www.espruino.com/ide/emulator.html then it uploads fine.

However if I turn minification on then it fails with exactly the error you report.

It looks like minification turned:

'é':["éâ+1","éc+1","ée+1","éj+1","éo+1","ép-1","ér+0","és+1","ét+1","év+2"]

into

é:["éâ+1","éc+1","ée+1","éj+1","éo+1","ép-1","ér+0","és+1","ét+1","év+2"]

Which Espruino doesn't like because it isn't expecting non-ASCII variable names.