feat: convert to library

.npmignore

@@ -0,0 +1,20 @@
+# Source files (only ship compiled dist/)
+src/
+tsconfig.json
+tsconfig.lib.json
+vite.config.ts
+
+# Development files
+.git/
+.github/
+node_modules/
+docs/
+public/
+
+# Web app specific (PoC only)
+index.html
+src/style.css
+src/app.ts
+
+# Build artifacts from web app
+*.map

README.md

@@ -8,6 +8,78 @@ Current OME-NGFF (i.e. OME-Zarr) tools tend to support different aspects of the
 
 Each tool could optionally publish a "capability manifest" which describes the tool's implementd capabilities with regards to the current and former NGFF Specifications. This manifest could simply live in the tool's Github repo, to be updated whenever relevant changes are made to the code. This manifest can then be interpreted computationally by any platform that wants to launch OME-NGFF tools (OMERO, BFF, Fileglancer, etc.)
 
+## Library Usage
+
+This package can be used as a library to determine which OME-Zarr viewers are compatible with a given dataset.
+
+### Installation
+
+```bash
+npm install @bioimagetools/capability-manifest
+```
+
+### Usage
+
+```typescript
+import {
+  initialize,
+  getCompatibleViewers,
+  type OmeZarrMetadata
+} from '@bioimagetools/capability-manifest';
+
+// Initialize once at application startup
+await initialize();
+
+// For each dataset, pass pre-parsed metadata
+const metadata: OmeZarrMetadata = {
+  version: '0.4',
+  axes: [
+    { name: 'z', type: 'space' },
+    { name: 'y', type: 'space' },
+    { name: 'x', type: 'space' }
+  ],
+  // ... other metadata
+};
+
+// Get list of compatible viewer names
+const viewers = getCompatibleViewers(metadata);
+// Returns: ['Avivator', 'Neuroglancer']
+```
+
+### API
+
+#### `initialize(): Promise<void>`
+
+Loads all viewer capability manifests. Must be called once at application startup before using other functions.
+
+Throws an error if no manifests can be loaded.
+
+#### `getCompatibleViewers(metadata: OmeZarrMetadata): string[]`
+
+Returns array of viewer names that are compatible with the given dataset metadata.
+
+- **Parameters:**
+  - `metadata`: Pre-parsed OME-Zarr metadata object (use ome-zarr.js or similar to parse from Zarr stores)
+
+- **Returns:** Array of viewer names (e.g., `['Avivator', 'Neuroglancer']`)
+
+- **Throws:** Error if library not initialized
+
+#### `getCompatibleViewersWithDetails(metadata: OmeZarrMetadata): Array<{name: string, validation: ValidationResult}>`
+
+Returns detailed compatibility information including validation errors and warnings for each compatible viewer.
+
+Useful for debugging or displaying why certain viewers work/don't work.
+
+### Types
+
+The library exports TypeScript types for all data structures:
+
+- `OmeZarrMetadata` - Structure of OME-Zarr metadata
+- `ViewerManifest` - Structure of viewer capability manifests
+- `ValidationResult` - Validation outcome with errors/warnings
+- `ValidationError`, `ValidationWarning` - Detailed validation messages
+
 ## Manifest Specification (DRAFT)
 
 | Attribute | Description |

index.html

@@ -26,6 +26,6 @@ <h1>OME-NGFF Tool Capabilities</h1>
         </div>
     </div>
 
-    <script type="module" src="/src/main.ts"></script>
+    <script type="module" src="/src/app.ts"></script>
 </body>
 </html>