Figma.mixed

Plugin and Widget API Questions
2

You need to check if the style is mixed and do something if it is like using the range functions to get styles of separate characters. TextNode · Figma Developers

let styleId = textNode.fillStyleId
if (styleId === figma.mixed) {
  // process each character individually 
  // or simply get the color of the first character
  styleId = textNode.getRangeFillStyleId(0, 1) as string
}
let styleName = figma.getStyleById(styleId).name
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