Update import statements to use type imports

Author: trbndev

src/edge.ts

@@ -1,4 +1,4 @@
-import CanvasColor from "./color";
+import type CanvasColor from "./color";
 
 export type EdgeSide = "top" | "right" | "bottom" | "left";
 export type EdgeEnd = "none" | "arrow";

src/index.ts

@@ -1,6 +1,6 @@
-import { CanvasColor } from './color'
-import { EdgeEnd, EdgeSide, Edge } from './edge'
-import { GenericNode, GroupNode, LinkNode, TextNode } from './node'
+import type { CanvasColor } from './color'
+import type { EdgeEnd, EdgeSide, Edge } from './edge'
+import type { GenericNode, GroupNode, LinkNode, TextNode } from './node'
 import { JSONCanvas } from './jsoncanvas'
 
 export {

src/jsoncanvas.ts

@@ -1,5 +1,5 @@
-import Edge from "./edge";
-import GenericNode from "./node";
+import type Edge from "./edge";
+import type GenericNode from "./node";
 
 export class JSONCanvas {
     private nodes: GenericNode[] = [];

src/node.ts

@@ -1,4 +1,4 @@
-import CanvasColor from "./color";
+import type CanvasColor from "./color";
 
 export interface GenericNode {
     id: string;