incorporate API feedback, https://github.com/microsoft/vscode/issues/16221

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

@@ -1260,8 +1260,8 @@ class InlayHintsAdapter {
 			tooltip: hint.tooltip && typeConvert.MarkdownString.from(hint.tooltip),
 			position: typeConvert.Position.from(hint.position),
 			kind: typeConvert.InlayHintKind.from(hint.kind ?? InlayHintKind.Other),
-			whitespaceBefore: hint.whitespaceBefore,
-			whitespaceAfter: hint.whitespaceAfter,
+			whitespaceBefore: hint.paddingLeft,
+			whitespaceAfter: hint.paddingRight,
 		};
 
 		if (typeof hint.label === 'string') {
@@ -1269,11 +1269,10 @@ class InlayHintsAdapter {
 		} else {
 			result.label = hint.label.map(part => {
 				let r: modes.InlayHintLabelPart = { label: part.label };
-				r.collapsible = part.collapsible;
-				if (Location.isLocation(part.action)) {
-					r.action = typeConvert.location.from(part.action);
-				} else if (part.action) {
-					r.action = this._commands.toInternal(part.action, disposables);
+				if (Location.isLocation(part.location)) {
+					r.location = typeConvert.location.from(part.location);
+				} else if (part.command) {
+					r.command = this._commands.toInternal(part.command, disposables);
 				}
 				return r;
 			});

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

@@ -1159,8 +1159,8 @@ export namespace InlayHint {
 			InlayHintKind.to(hint.kind)
 		);
 		res.tooltip = htmlContent.isMarkdownString(hint.tooltip) ? MarkdownString.to(hint.tooltip) : hint.tooltip;
-		res.whitespaceAfter = hint.whitespaceAfter;
-		res.whitespaceBefore = hint.whitespaceBefore;
+		res.paddingLeft = hint.paddingLeft;
+		res.paddingRight = hint.paddingRight;
 		return res;
 	}
 }
@@ -1169,11 +1169,11 @@ export namespace InlayHintLabelPart {
 
 	export function to(converter: CommandsConverter, part: modes.InlayHintLabelPart): types.InlayHintLabelPart {
 		const result = new types.InlayHintLabelPart(part.label);
-		result.collapsible = part.collapsible;
-		if (modes.Command.is(part.action)) {
-			result.action = converter.fromInternal(part.action);
-		} else if (part.action) {
-			result.action = location.to(part.action);
+
+		if (modes.Command.is(part.command)) {
+			result.command = converter.fromInternal(part.command);
+		} else if (part.location) {
+			result.location = location.to(part.location);
 		}
 		return result;
 	}

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

@@ -1424,24 +1424,23 @@ export enum InlayHintKind {
 @es5ClassCompat
 export class InlayHintLabelPart {
 	label: string;
-	collapsible?: boolean;
-	action?: vscode.Command | Location; // invokes provider
+	location?: Location;
+	command?: vscode.Command;
+
 	constructor(label: string) {
 		this.label = label;
 	}
-	toString(): string {
-		return this.label;
-	}
 }
 
 @es5ClassCompat
 export class InlayHint implements vscode.InlayHint {
+
 	label: string | InlayHintLabelPart[];
 	tooltip?: string | vscode.MarkdownString;
 	position: Position;
 	kind?: vscode.InlayHintKind;
-	whitespaceBefore?: boolean;
-	whitespaceAfter?: boolean;
+	paddingLeft?: boolean;
+	paddingRight?: boolean;
 
 	constructor(label: string | InlayHintLabelPart[], position: Position, kind?: vscode.InlayHintKind) {
 		this.label = label;