Fix export to respect ESM syntax

.gitignore

@@ -132,3 +132,4 @@ node_modules/
 tests/package-lock.json
 javascript/tsconfig.tsbuildinfo
 javascript/.eslintcache
+javascript/coverage/

javascript/jest.config.cjs

@@ -3,31 +3,10 @@
  * Distributed under the terms of the Modified BSD License.
  */
 
-const path = require('path');
 const esModules = ['lib0', 'y-protocols', 'y-websocket', 'yjs'].join('|');
 
 module.exports = {
-  preset: 'ts-jest/presets/js-with-babel',
-  testTimeout: 10000,
-  testPathIgnorePatterns: ['/lib/', '/node_modules/'],
-  moduleFileExtensions: [
-    'ts',
-    'tsx',
-    'js',
-    'jsx',
-    'json',
-    'node',
-    'mjs',
-    'cjs'
-  ],
-  transformIgnorePatterns: [`/node_modules/(?!${esModules}).+`],
-  reporters: ['default'],
-  coverageReporters: ['json', 'lcov', 'text', 'html'],
-  coverageDirectory: path.join(__dirname, 'coverage'),
-  testRegex: '/test/.*.spec.ts[x]?$',
-  globals: {
-    'ts-jest': {
-      tsconfig: `./tsconfig.test.json`
-    }
-  }
+  testEnvironment: 'node',
+  testRegex: 'lib/test/.*.spec.js[x]?$',
+
 };

javascript/package.json

@@ -47,21 +47,17 @@
     "yjs": "^13.5.40"
   },
   "devDependencies": {
-    "@babel/core": "^7.10.2",
-    "@babel/preset-env": "^7.10.2",
-    "@types/jest": "^26.0.10",
-    "@typescript-eslint/eslint-plugin": "~5.28.0",
-    "@typescript-eslint/parser": "~5.28.0",
-    "eslint": "~8.17.0",
-    "eslint-config-prettier": "~8.5.0",
-    "eslint-plugin-jest": "~26.5.3",
-    "eslint-plugin-prettier": "~4.0.0",
-    "eslint-plugin-react": "~7.29.4",
-    "jest": "^26.4.2",
-    "prettier": "~2.6.0",
-    "rimraf": "~3.0.0",
-    "ts-jest": "^26.3.0",
-    "typescript": "~4.7.3"
+    "@types/jest": "^29.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.36.0",
+    "@typescript-eslint/parser": "^5.36.0",
+    "eslint": "^8.17.0",
+    "eslint-config-prettier": "^8.5.0",
+    "eslint-plugin-jest": "^27.0.0",
+    "eslint-plugin-prettier": "^4.0.0",
+    "jest": "^29.0.0",
+    "prettier": "^2.6.0",
+    "rimraf": "^3.0.0",
+    "typescript": "^4.8.0"
   },
   "publishConfig": {
     "access": "public"

javascript/src/api.ts

@@ -193,29 +193,34 @@ export interface ISharedNotebook extends ISharedDocument {
   deleteMetadata(key: string): void;
 
   /**
-   * Returns some metadata associated with the notebook.
+   * Returns all metadata associated with the notebook.
    *
-   * If no `key` is provided, it will return all metadata.
-   * Else it will return the value for that key.
+   * @returns Notebook's metadata.
+   */
+  getMetadata(): nbformat.INotebookMetadata;
+
+  /**
+   * Returns a metadata associated with the notebook.
    *
    * @param key Key to get from the metadata
    * @returns Notebook's metadata.
    */
-  getMetadata(key?: string): nbformat.INotebookMetadata;
+  getMetadata(key: string): PartialJSONValue | undefined;
 
   /**
-   * Sets some metadata associated with the notebook.
+   * Sets all metadata associated with the notebook.
    *
-   * If only one argument is provided, it will override all notebook metadata.
-   * Otherwise a single key will be set to a new value.
+   * @param metadata All Notebook's metadata.
+   */
+  setMetadata(metadata: nbformat.INotebookMetadata): void;
+
+  /**
+   * Sets a metadata associated with the notebook.
    *
-   * @param metadata All Notebook's metadata or the key to set.
+   * @param metadata The key to set.
    * @param value New metadata value
    */
-  setMetadata(
-    metadata: nbformat.INotebookMetadata | string,
-    value?: PartialJSONValue
-  ): void;
+  setMetadata(metadata: string, value: PartialJSONValue): void;
 
   /**
    * Updates the metadata associated with the notebook.
@@ -427,28 +432,34 @@ export interface ISharedBaseCell<
   deleteMetadata(key: string): void;
 
   /**
-   * Returns some metadata associated with the cell.
+   * Returns all metadata associated with the cell.
    *
-   * If a `key` is provided, returns the metadata value.
-   * Otherwise returns all metadata
+   * @returns Cell's metadata.
+   */
+  getMetadata(): Partial<Metadata>;
+
+  /**
+   * Returns a metadata associated with the cell.
    *
+   * @param key Metadata key to get
    * @returns Cell's metadata.
    */
-  getMetadata(key?: string): Partial<Metadata>;
+  getMetadata(key: string): PartialJSONValue | undefined;
 
   /**
    * Sets some cell metadata.
    *
-   * If only one argument is provided, it will override all cell metadata.
-   * Otherwise a single key will be set to a new value.
+   * @param metadata Cell's metadata.
+   */
+  setMetadata(metadata: Partial<Metadata>): void;
+
+  /**
+   * Sets a cell metadata.
    *
-   * @param metadata Cell's metadata or key.
+   * @param metadata Cell's metadata key.
    * @param value Metadata value
    */
-  setMetadata(
-    metadata: Partial<Metadata> | string,
-    value?: PartialJSONValue
-  ): void;
+  setMetadata(metadata: string, value: PartialJSONValue): void;
 
   /**
    * Serialize the model to JSON.

javascript/src/index.ts

@@ -4,9 +4,9 @@
 |----------------------------------------------------------------------------*/
 /**
  * @packageDocumentation
- * @module shared-models
+ * @module ydoc
  */
 
-export * from './api';
-export * from './ymodels';
-export * from './utils';
+export * from './api.js';
+export * from './ymodels.js';
+export * from './utils.js';

javascript/src/utils.ts

@@ -4,7 +4,7 @@
 |----------------------------------------------------------------------------*/
 
 import * as Y from 'yjs';
-import * as models from './api';
+import * as models from './api.js';
 
 export function convertYMapEventToMapChange(
   event: Y.YMapEvent<any>

javascript/src/ymodels.ts

@@ -33,7 +33,7 @@ import type {
   NotebookChange,
   SharedCell,
   StateChange
-} from './api';
+} from './api.js';
 
 /**
  * Abstract interface to define Shared Models that can be bound to a text editor using any existing
@@ -709,12 +709,14 @@ export class YBaseCell<Metadata extends nbformat.IBaseCellMetadata>
   }
 
   /**
-   * Returns the metadata associated with the cell.
+   * Returns all or a single metadata associated with the cell.
    *
-   * @param key
-   * @returns Cell metadata.
+   * @param key The metadata key
+   * @returns cell's metadata.
    */
-  getMetadata(key?: string): Partial<Metadata> {
+  getMetadata(): Partial<Metadata>;
+  getMetadata(key: string): PartialJSONValue | undefined;
+  getMetadata(key?: string): Partial<Metadata> | PartialJSONValue | undefined {
     // Transiently the metadata can be missing - like during destruction
     const metadata = this.ymodel.get('metadata') ?? {};
 
@@ -729,14 +731,16 @@ export class YBaseCell<Metadata extends nbformat.IBaseCellMetadata>
   }
 
   /**
-   * Sets some cell metadata.
+   * Sets all or a single cell metadata.
    *
    * If only one argument is provided, it will override all cell metadata.
    * Otherwise a single key will be set to a new value.
    *
-   * @param metadata Cell's metadata or key.
+   * @param metadata Cell's metadata key or cell's metadata.
    * @param value Metadata value
    */
+  setMetadata(metadata: Partial<Metadata>): void;
+  setMetadata(metadata: string, value: PartialJSONValue): void;
   setMetadata(
     metadata: Partial<Metadata> | string,
     value?: PartialJSONValue
@@ -1467,6 +1471,8 @@ export class YNotebook
    * @param key Key to get from the metadata
    * @returns Notebook's metadata.
    */
+  getMetadata(): nbformat.INotebookMetadata;
+  getMetadata(key: string): PartialJSONValue | undefined;
   getMetadata(key?: string): nbformat.INotebookMetadata {
     const meta = this.ymeta.get('metadata') ?? {};
 
@@ -1489,6 +1495,8 @@ export class YNotebook
    * @param metadata All Notebook's metadata or the key to set.
    * @param value New metadata value
    */
+  setMetadata(metadata: nbformat.INotebookMetadata): void;
+  setMetadata(metadata: string, value: PartialJSONValue): void;
   setMetadata(
     metadata: nbformat.INotebookMetadata | string,
     value?: PartialJSONValue