I'm having trouble casting geometryType as I keep getting this error :
IShape is a Type not a Namespace
when attempting to do the following:
interface IShape {
readonly geometryType: "RECTANGLE" | "SQUARE"
}
let geometryType = "SQUARE" as IShape.geometryType
const geometry: IShape = {
geometryType: geometryType
}
To ensure TypeScript that a value will not change, add as const to allow it to infer the type.
interface IShape {
readonly geometryType: "RECTANGLE" | "SQUARE"
}
let geometryType = "SQUARE" as const
const geometry: IShape = {
geometryType: geometryType
}
You can also separate and define the Geometry Type for better use:
type GeometryType = "RECTANGLE" | "SQUARE";
interface IShape {
readonly geometryType: GeometryType;
}
let geometryType: GeometryType = "SQUARE";
const geometry: IShape = {
geometryType: geometryType
}
Another way to retrieve the property geometryType type from the IShape interface is by using the syntax IShape['geometryType'].
interface IShape {
readonly geometryType: "CIRCLE" | "TRIANGLE"
}
let shapeType = "TRIANGLE" as IShape['geometryType'];
const shape: IShape = {
geometryType: shapeType
}
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