Select symbol instance layers by name

selectSymbolInstanceLayersByName.js

const sketch = require("sketch")
const util = require("util")
const document = sketch.getSelectedDocument()
const documentData = document.sketchObject.documentData()
const selections = document.selectedLayers
const selection = selections.layers[0]

let layerName = 'Oval'

let instanceOverrides = util.toArray(selection.sketchObject.overrideContainer().flattenedChildren())

let uniqueOverrides = []

instanceOverrides.forEach(o => {
	let overrideMatch = uniqueOverrides.find(u => u.availableOverride().overridePoint().path() == o.availableOverride().overridePoint().path())

	if (!overrideMatch) uniqueOverrides.push(o)
})

let selectOverrides = uniqueOverrides.filter(o => String(o.availableOverride().affectedLayer().name()) == layerName)

documentData.setSelectedOverrides(selectOverrides.map(o => o.selectionID()))