external jsx file don't use ecmascript 5

[different_Marvel5D0A]

I have a simple .jsx script for AE.

If i use use some ECMAscript 5 statements (like let assignment or arrow functions) the program fail with syntax error:

writeln(app.project.expressionEngine); // ouput javascript-1.0

let a = 1; // Syntax Error: Expected: ;

const something = () => { // Syntax Error: ) does not have a value

     // ...

}

AE project has set javascript as expression engine and expressions inside a property of a composition that use EXCMAScript 5 works correctly.

The problem is only with external jsx file.

[Justin Taylor-Hyper Brew · Accepted solution]

ExtendScript is based on ES3, it's completely different than the new Javascript Expression Engine which is based on ES6. ES3 doesn't support let or arrow functions. You'll need to use var and standard function(){} instead.

[different_Marvel5D0A]

oh damn! it is strange that two different engines are used. it would be nice if the external script engine was also updated

thanks

[Justin Taylor-Hyper Brew]

ExtendScript is going to be replaced with UXP eventually which is modern JS. See more info on that here: https://medium.com/adobetech/scripting-changes-in-adobes-video-applications-1bee1fc0fe47