How to represent 'basic style'? Is it possible to directly copy the 'none' style?

Based on the 'basic paragraph', it must be like this: basedOn:"[Basic Paragraph]"

There are the 2 defaults, [Basic Paragraph] and [No Paragraph Style], and they are not the same.

The root read only [No Paragraph Style] is the same for all documents. All documents also have a [Basic Paragraph], but it can be defined differently in any document, which creates potential problems when cutting and pasting between documents with different [Basic Paragraph] definitions.

I usually use [No Paragraph Style] for Based On when creating my document’s default style and give it a unique name—something like ProjectNameDefault.

Also, root styles can’t be edited or copied, but you can add a new style that is based on the root, which effectively creates an editable document root style.

Here’s a root [No Paragraph Style] copy with an adjusted font and point size:

// a copy of the root paragraph style with a customized applied font, and pont size
var s = app.documents[0].paragraphStyles.add({name:"MyDefault", basedOn:"[No Paragraph Style]", appliedFont: "Vista Sans OTCE", pointSize:10})

Hi ​@dublove , [None] is a root style and is read only—you can get more info with this:

try {
    var noneCellSty = app.documents[0].cellStyles.itemByName('[None]');
    noneCellSty.duplicate();
}catch(e) {
    alert(e)
}