notebook: convert NotebookKernelPreload to a class

src/vs/vscode.proposed.d.ts

@@ -1764,10 +1764,24 @@ declare module 'vscode' {
 
 	//#region https://github.com/microsoft/vscode/issues/106744, NotebookKernel
 
-	// todo@API make class?
-	export interface NotebookKernelPreload {
-		provides?: string | string[];
-		uri: Uri;
+	export class NotebookKernelPreload {
+		/**
+		 * APIs that the preload provides to the renderer. These are matched
+		 * against the `dependencies` and `optionalDependencies` arrays in the
+		 * notebook renderer contribution point.
+		 */
+		readonly provides: string[];
+
+		/**
+		 * URI for the file to preload
+		 */
+		readonly uri: Uri;
+
+		/**
+		 * @param uri URI for the file to preload
+		 * @param provides Value for the `provides` property
+		 */
+		constructor(uri: Uri, provides?: string | string[]);
 	}
 
 	export interface NotebookCellExecuteStartContext {

src/vs/workbench/api/common/extHost.api.impl.ts

@@ -1251,6 +1251,7 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			NotebookCellMetadata: extHostTypes.NotebookCellMetadata,
 			NotebookCellData: extHostTypes.NotebookCellData,
 			NotebookData: extHostTypes.NotebookData,
+			NotebookKernelPreload: extHostTypes.NotebookKernelPreload,
 			NotebookCellStatusBarAlignment: extHostTypes.NotebookCellStatusBarAlignment,
 			NotebookEditorRevealType: extHostTypes.NotebookEditorRevealType,
 			NotebookCellOutput: extHostTypes.NotebookCellOutput,

src/vs/workbench/api/common/extHostTypeConverters.ts

@@ -1660,16 +1660,14 @@ export namespace NotebookKernelPreload {
 	export function from(preload: vscode.NotebookKernelPreload): { uri: UriComponents; provides: string[] } {
 		return {
 			uri: preload.uri,
+			// todo@connor4312: the conditional here can be removed after a migration period
 			provides: typeof preload.provides === 'string'
 				? [preload.provides]
 				: preload.provides ?? []
 		};
 	}
 	export function to(preload: { uri: UriComponents; provides: string[] }): vscode.NotebookKernelPreload {
-		return {
-			uri: URI.revive(preload.uri),
-			provides: preload.provides
-		};
+		return new types.NotebookKernelPreload(URI.revive(preload.uri), preload.provides);
 	}
 }
 

src/vs/workbench/api/common/extHostTypes.ts

@@ -3168,6 +3168,17 @@ export enum NotebookControllerAffinity {
 	Preferred = 2
 }
 
+export class NotebookKernelPreload {
+	public readonly provides: string[];
+
+	constructor(
+		public readonly uri: vscode.Uri,
+		provides: string | string[] = []
+	) {
+		this.provides = typeof provides === 'string' ? [provides] : provides;
+	}
+}
+
 //#endregion
 
 //#region Timeline