Add standalone type definitions

src/types/Map.ts

@@ -0,0 +1,36 @@
+import { Grid } from "./Grid";
+
+export type BaseMap = {
+  id: string;
+  name: string;
+  owner: string;
+  grid: Grid;
+  width: number;
+  height: number;
+  type: string;
+  lastModified: number;
+  created: number;
+  showGrid: boolean;
+  snapToGrid: boolean;
+};
+
+export type DefaultMap = BaseMap & {
+  type: "default";
+  key: string;
+};
+
+export type FileMapResolutions = {
+  low?: string;
+  medium?: string;
+  high?: string;
+  ultra?: string;
+};
+
+export type FileMap = BaseMap & {
+  type: "file";
+  file: string;
+  resolutions: FileMapResolutions;
+  thumbnail: string;
+};
+
+export type Map = DefaultMap | FileMap;