refactor: extract viewer2d workspace package

tests/viewer2d.contract.test.ts

@@ -0,0 +1,26 @@
+import { readFile } from 'node:fs/promises';
+import { describe, expect, it } from 'vitest';
+import { isCad2DFile, parseCad } from '@hmwebviewer/viewer2d';
+
+describe('viewer2d package interface', () => {
+  it('parses the sample DXF through the public package interface', async () => {
+    const file = await readFile(new URL('../public/samples/simple.dxf', import.meta.url));
+    const result = await parseCad({
+      name: 'simple.dxf',
+      data: file.buffer.slice(file.byteOffset, file.byteOffset + file.byteLength),
+    });
+    const entities = result.entities as Array<{ layer?: string; type?: string }>;
+
+    expect(isCad2DFile('drawing.DWG')).toBe(true);
+    expect(isCad2DFile('drawing.dxf')).toBe(true);
+    expect(isCad2DFile('drawing.pdf')).toBe(false);
+    expect(entities.map(({ type, layer }) => [type, layer])).toEqual([
+      ['LINE', 'OUTLINE'],
+      ['LINE', 'OUTLINE'],
+      ['LINE', 'OUTLINE'],
+      ['LINE', 'OUTLINE'],
+      ['CIRCLE', '0'],
+      ['TEXT', '0'],
+    ]);
+  });
+});