diff --git a/src/vs/editor/contrib/codeAction/codeAction.ts b/src/vs/editor/contrib/codeAction/codeAction.ts
index 93873f17ffbcd..f706070a89bb7 100644
--- a/src/vs/editor/contrib/codeAction/codeAction.ts
+++ b/src/vs/editor/contrib/codeAction/codeAction.ts
@@ -117,8 +117,8 @@ function getCodeActionProviders(
 }
 
 registerLanguageCommand('_executeCodeActionProvider', async function (accessor, args): Promise<ReadonlyArray<CodeAction>> {
-	const { resource, range, kind } = args;
-	if (!(resource instanceof URI) || !Range.isIRange(range)) {
+	const { resource, rangeOrSelection, kind } = args;
+	if (!(resource instanceof URI)) {
 		throw illegalArgument();
 	}
 
@@ -127,9 +127,19 @@ registerLanguageCommand('_executeCodeActionProvider', async function (accessor,
 		throw illegalArgument();
 	}
 
+	const validatedRangeOrSelection = Selection.isISelection(rangeOrSelection)
+		? Selection.liftSelection(rangeOrSelection)
+		: Range.isIRange(rangeOrSelection)
+			? model.validateRange(rangeOrSelection)
+			: undefined;
+
+	if (!validatedRangeOrSelection) {
+		throw illegalArgument();
+	}
+
 	const codeActionSet = await getCodeActions(
 		model,
-		model.validateRange(range),
+		validatedRangeOrSelection,
 		{ type: 'manual', filter: { includeSourceActions: true, kind: kind && kind.value ? new CodeActionKind(kind.value) : undefined } },
 		CancellationToken.None);
 
diff --git a/src/vs/workbench/api/common/extHostApiCommands.ts b/src/vs/workbench/api/common/extHostApiCommands.ts
index ff2a106f427f2..d84da000c3fdd 100644
--- a/src/vs/workbench/api/common/extHostApiCommands.ts
+++ b/src/vs/workbench/api/common/extHostApiCommands.ts
@@ -135,7 +135,7 @@ export class ExtHostApiCommands {
 			description: 'Execute code action provider.',
 			args: [
 				{ name: 'uri', description: 'Uri of a text document', constraint: URI },
-				{ name: 'range', description: 'Range in a text document', constraint: types.Range },
+				{ name: 'rangeOrSelection', description: 'Range in a text document. Some refactoring provider requires Selection object.', constraint: types.Range },
 				{ name: 'kind', description: '(optional) Code action kind to return code actions for', constraint: (value: any) => !value || typeof value.value === 'string' },
 			],
 			returns: 'A promise that resolves to an array of Command-instances.'
@@ -480,10 +480,12 @@ export class ExtHostApiCommands {
 		});
 	}
 
-	private _executeCodeActionProvider(resource: URI, range: types.Range, kind?: string): Promise<(vscode.CodeAction | vscode.Command | undefined)[] | undefined> {
+	private _executeCodeActionProvider(resource: URI, rangeOrSelection: types.Range | types.Selection, kind?: string): Promise<(vscode.CodeAction | vscode.Command | undefined)[] | undefined> {
 		const args = {
 			resource,
-			range: typeConverters.Range.from(range),
+			rangeOrSelection: types.Selection.isSelection(rangeOrSelection)
+				? typeConverters.Selection.from(rangeOrSelection)
+				: typeConverters.Range.from(rangeOrSelection),
 			kind
 		};
 		return this._commands.executeCommand<CustomCodeAction[]>('_executeCodeActionProvider', args)
@@ -504,6 +506,7 @@ export class ExtHostApiCommands {
 					if (codeAction.command) {
 						ret.command = this._commands.converter.fromInternal(codeAction.command);
 					}
+					ret.isPreferred = codeAction.isPreferred;
 					return ret;
 				}
 			}));
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index 9b0cd9c9cc88d..e3c30b6e3a070 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1075,6 +1075,8 @@ export class CodeAction {
 
 	kind?: CodeActionKind;
 
+	isPreferred?: boolean;
+
 	constructor(title: string, kind?: CodeActionKind) {
 		this.title = title;
 		this.kind = kind;
diff --git a/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts b/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts
index 02dbd2c785243..f2c5b0043fe9a 100644
--- a/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts
+++ b/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts
@@ -631,6 +631,61 @@ suite('ExtHostLanguageFeatureCommands', function () {
 		});
 	});
 
+	test('vscode.executeCodeActionProvider passes Range to provider although Selection is passed in #77997', function () {
+		disposables.push(extHost.registerCodeActionProvider(nullExtensionDescription, defaultSelector, {
+			provideCodeActions(document, rangeOrSelection): vscode.CodeAction[] {
+				return [{
+					command: {
+						arguments: [document, rangeOrSelection],
+						command: 'command',
+						title: 'command_title',
+					},
+					kind: types.CodeActionKind.Empty.append('foo'),
+					title: 'title',
+				}];
+			}
+		}));
+
+		const selection = new types.Selection(0, 0, 1, 1);
+
+		return rpcProtocol.sync().then(() => {
+			return commands.executeCommand<vscode.CodeAction[]>('vscode.executeCodeActionProvider', model.uri, selection).then(value => {
+				assert.equal(value.length, 1);
+				const [first] = value;
+				assert.ok(first.command);
+				assert.ok(first.command!.arguments![1] instanceof types.Selection);
+				assert.ok(first.command!.arguments![1].isEqual(selection));
+			});
+		});
+	});
+
+	test('vscode.executeCodeActionProvider results seem to be missing their `isPreferred` property #78098', function () {
+		disposables.push(extHost.registerCodeActionProvider(nullExtensionDescription, defaultSelector, {
+			provideCodeActions(document, rangeOrSelection): vscode.CodeAction[] {
+				return [{
+					command: {
+						arguments: [document, rangeOrSelection],
+						command: 'command',
+						title: 'command_title',
+					},
+					kind: types.CodeActionKind.Empty.append('foo'),
+					title: 'title',
+					isPreferred: true
+				}];
+			}
+		}));
+
+		const selection = new types.Selection(0, 0, 1, 1);
+
+		return rpcProtocol.sync().then(() => {
+			return commands.executeCommand<vscode.CodeAction[]>('vscode.executeCodeActionProvider', model.uri, selection).then(value => {
+				assert.equal(value.length, 1);
+				const [first] = value;
+				assert.equal(first.isPreferred, true);
+			});
+		});
+	});
+
 	// --- code lens
 
 	test('CodeLens, back and forth', function () {