feat: prefer hash when importing libraries & expose importLibrary (#3320)

src/packages/excalidraw/CHANGELOG.md

@@ -18,6 +18,8 @@ Please add the latest change on the top under the correct section.
 
 ### Features
 
+- #### BREAKING CHANGE
+  Use `location.hash` when importing libraries to fix installation issues. This will require host apps to add a `hashchange` listener and call the newly exposed `excalidrawAPI.importLibrary(url)` API when applicable [#3320](https://github.com/excalidraw/excalidraw/pull/3320).
 - Append `location.pathname` to `libraryReturnUrl` default url [#3325](https://github.com/excalidraw/excalidraw/pull/3325).
 
 ## 0.5.0 (2021-03-21)

src/packages/excalidraw/README.md

@@ -473,6 +473,7 @@ You can pass a `ref` when you want to access some excalidraw APIs. We expose the
 | history | `{ clear: () => void }` | This is the history API. `history.clear()` will clear the history |
 | setScrollToContent | <pre> (<a href="https://github.com/excalidraw/excalidraw/blob/master/src/element/types.ts#L78">ExcalidrawElement[]</a>) => void </pre> | Scroll to the nearest element to center |
 | setCanvasOffsets | `() => void` | Updates the offsets for the Excalidraw component so that the coordinates are computed correctly (for example the cursor position). You should call this API when your app changes the dimensions/position of the Excalidraw container, such as when toggling a sidebar. You don't have to call this when the position is changed on page scroll (we handled that ourselves). |
+| importLibrary | `(url: string) => void` | Imports library from given URL. You should call this on `hashchange`, passing the `addLibrary` value if you detect it. |
 
 #### `readyPromise`