One potential use of the Esri Icon Fonts is to use them as symbol property of Graphic.
In the code snippet below, a TextSymbol is created by specifying the color, text, and font.
The font property is created by autocasting the Font class. Set the font family property toCalcite to access the Esri Icon Fonts.
const textSymbol = {
type: "text", // autocasts as new TextSymbol()
color: "#7A003C",
text: "\ue61d", // esri-icon-map-pin
font: {
// autocasts as new Font()
size: 36,
family: "CalciteWebCoreIcons" // Esri Icon Font
}
};