How do I "say . . . using" in Javascript for Automation?

Question

In Applescript, I can specify the voice the system uses to speak text as follows:

say "Hello" using "Alex"

In Javascript, I can do something similar:

var ScriptEditor = Application("Script Editor");
ScriptEditor.includeStandardAdditions = true;

ScriptEditor.say("Hello!")

But I don't know how to specify the specific voice; I always have to use the system. Is there a way to specify the using parameter, or another version of say that allows the code to specify the voice?

Answer 1

Apple's documentation describes how to call commands which have both direct parameters (the text) and named parameters (the using). In this case, you would do this:

var ScriptEditor = Application("Script Editor");
ScriptEditor.includeStandardAdditions = true;

ScriptEditor.say("Hello", {using: "Alex"})