diff --git a/package.json b/package.json
index 3513fb0e652..61924a8e35c 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,7 @@
     "spdlog": "^0.13.0",
     "sudo-prompt": "9.2.1",
     "tas-client-umd": "0.1.4",
-    "v8-inspect-profiler": "^0.0.21",
+    "v8-inspect-profiler": "^0.0.22",
     "vscode-oniguruma": "1.5.1",
     "vscode-proxy-agent": "^0.11.0",
     "vscode-regexpp": "^3.1.0",
diff --git a/src/vs/editor/contrib/suggest/suggestModel.ts b/src/vs/editor/contrib/suggest/suggestModel.ts
index 7089173d954..c6ff958aa6c 100644
--- a/src/vs/editor/contrib/suggest/suggestModel.ts
+++ b/src/vs/editor/contrib/suggest/suggestModel.ts
@@ -235,6 +235,11 @@ export class SuggestModel implements IDisposable {
 				return;
 			}
 
+			if (LineContext.shouldAutoTrigger(this._editor)) {
+				// don't trigger by trigger characters when this is a case for quick suggest
+				return;
+			}
+
 			if (!text) {
 				// came here from the compositionEnd-event
 				const position = this._editor.getPosition()!;
diff --git a/src/vs/editor/contrib/suggest/test/suggestModel.test.ts b/src/vs/editor/contrib/suggest/test/suggestModel.test.ts
index 882e001e735..af9fc5697a1 100644
--- a/src/vs/editor/contrib/suggest/test/suggestModel.test.ts
+++ b/src/vs/editor/contrib/suggest/test/suggestModel.test.ts
@@ -864,4 +864,59 @@ suite('SuggestModel - TriggerAndCancelOracle', function () {
 			});
 		});
 	});
+
+	test('registerCompletionItemProvider with letters as trigger characters block other completion items to show up #127815', async function () {
+
+		disposables.push(CompletionProviderRegistry.register({ scheme: 'test' }, {
+			provideCompletionItems(doc, pos) {
+				return {
+					suggestions: [{
+						kind: CompletionItemKind.Class,
+						label: 'AAAA',
+						insertText: 'WordTriggerA',
+						range: new Range(pos.lineNumber, pos.column, pos.lineNumber, pos.column)
+					}],
+				};
+			}
+		}));
+		disposables.push(CompletionProviderRegistry.register({ scheme: 'test' }, {
+			triggerCharacters: ['a', '.'],
+			provideCompletionItems(doc, pos) {
+				return {
+					suggestions: [{
+						kind: CompletionItemKind.Class,
+						label: 'AAAA',
+						insertText: 'AutoTriggerA',
+						range: new Range(pos.lineNumber, pos.column, pos.lineNumber, pos.column)
+					}],
+				};
+			},
+		}));
+
+		return withOracle(async (model, editor) => {
+
+			await assertEvent(model.onDidSuggest, () => {
+				editor.setValue('');
+				editor.setSelection(new Selection(1, 1, 1, 1));
+				editor.trigger('keyboard', Handler.Type, { text: '.' });
+
+			}, event => {
+				assert.strictEqual(event.auto, true);
+				assert.strictEqual(event.completionModel.items.length, 1);
+			});
+
+
+			editor.getModel().setValue('');
+
+			await assertEvent(model.onDidSuggest, () => {
+				editor.setValue('');
+				editor.setSelection(new Selection(1, 1, 1, 1));
+				editor.trigger('keyboard', Handler.Type, { text: 'a' });
+
+			}, event => {
+				assert.strictEqual(event.auto, true);
+				assert.strictEqual(event.completionModel.items.length, 2);
+			});
+		});
+	});
 });
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index f21bb9cd290..d94cfc164de 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -13,7 +13,6 @@ import * as modes from 'vs/editor/common/modes';
 import { ExtHostDocuments } from 'vs/workbench/api/common/extHostDocuments';
 import { ExtHostCommands, CommandsConverter } from 'vs/workbench/api/common/extHostCommands';
 import { ExtHostDiagnostics } from 'vs/workbench/api/common/extHostDiagnostics';
-import { asPromise } from 'vs/base/common/async';
 import * as extHostProtocol from './extHost.protocol';
 import { regExpLeadsToEndlessLoop, regExpFlags } from 'vs/base/common/strings';
 import { IPosition } from 'vs/editor/common/core/position';
@@ -47,17 +46,16 @@ class DocumentSymbolAdapter {
 		this._provider = provider;
 	}
 
-	provideDocumentSymbols(resource: URI, token: CancellationToken): Promise<modes.DocumentSymbol[] | undefined> {
+	async provideDocumentSymbols(resource: URI, token: CancellationToken): Promise<modes.DocumentSymbol[] | undefined> {
 		const doc = this._documents.getDocument(resource);
-		return asPromise(() => this._provider.provideDocumentSymbols(doc, token)).then(value => {
-			if (isFalsyOrEmpty(value)) {
-				return undefined;
-			} else if (value![0] instanceof DocumentSymbol) {
-				return (<DocumentSymbol[]>value).map(typeConvert.DocumentSymbol.from);
-			} else {
-				return DocumentSymbolAdapter._asDocumentSymbolTree(<SymbolInformation[]>value);
-			}
-		});
+		const value = await this._provider.provideDocumentSymbols(doc, token);
+		if (isFalsyOrEmpty(value)) {
+			return undefined;
+		} else if (value![0] instanceof DocumentSymbol) {
+			return (<DocumentSymbol[]>value).map(typeConvert.DocumentSymbol.from);
+		} else {
+			return DocumentSymbolAdapter._asDocumentSymbolTree(<SymbolInformation[]>value);
+		}
 	}
 
 	private static _asDocumentSymbolTree(infos: SymbolInformation[]): modes.DocumentSymbol[] {
@@ -194,10 +192,11 @@ class DefinitionAdapter {
 		private readonly _provider: vscode.DefinitionProvider
 	) { }
 
-	provideDefinition(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
+	async provideDefinition(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
-		return asPromise(() => this._provider.provideDefinition(doc, pos, token)).then(convertToLocationLinks);
+		const value = await this._provider.provideDefinition(doc, pos, token);
+		return convertToLocationLinks(value);
 	}
 }
 
@@ -208,10 +207,11 @@ class DeclarationAdapter {
 		private readonly _provider: vscode.DeclarationProvider
 	) { }
 
-	provideDeclaration(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
+	async provideDeclaration(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
-		return asPromise(() => this._provider.provideDeclaration(doc, pos, token)).then(convertToLocationLinks);
+		const value = await this._provider.provideDeclaration(doc, pos, token);
+		return convertToLocationLinks(value);
 	}
 }
 
@@ -222,10 +222,11 @@ class ImplementationAdapter {
 		private readonly _provider: vscode.ImplementationProvider
 	) { }
 
-	provideImplementation(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
+	async provideImplementation(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
-		return asPromise(() => this._provider.provideImplementation(doc, pos, token)).then(convertToLocationLinks);
+		const value = await this._provider.provideImplementation(doc, pos, token);
+		return convertToLocationLinks(value);
 	}
 }
 
@@ -236,10 +237,11 @@ class TypeDefinitionAdapter {
 		private readonly _provider: vscode.TypeDefinitionProvider
 	) { }
 
-	provideTypeDefinition(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
+	async provideTypeDefinition(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LocationLink[]> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
-		return asPromise(() => this._provider.provideTypeDefinition(doc, pos, token)).then(convertToLocationLinks);
+		const value = await this._provider.provideTypeDefinition(doc, pos, token);
+		return convertToLocationLinks(value);
 	}
 }
 
@@ -250,24 +252,22 @@ class HoverAdapter {
 		private readonly _provider: vscode.HoverProvider,
 	) { }
 
-	public provideHover(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.Hover | undefined> {
+	public async provideHover(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.Hover | undefined> {
 
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideHover(doc, pos, token)).then(value => {
-			if (!value || isFalsyOrEmpty(value.contents)) {
-				return undefined;
-			}
-			if (!value.range) {
-				value.range = doc.getWordRangeAtPosition(pos);
-			}
-			if (!value.range) {
-				value.range = new Range(pos, pos);
-			}
-
-			return typeConvert.Hover.from(value);
-		});
+		const value = await this._provider.provideHover(doc, pos, token);
+		if (!value || isFalsyOrEmpty(value.contents)) {
+			return undefined;
+		}
+		if (!value.range) {
+			value.range = doc.getWordRangeAtPosition(pos);
+		}
+		if (!value.range) {
+			value.range = new Range(pos, pos);
+		}
+		return typeConvert.Hover.from(value);
 	}
 }
 
@@ -278,17 +278,16 @@ class EvaluatableExpressionAdapter {
 		private readonly _provider: vscode.EvaluatableExpressionProvider,
 	) { }
 
-	public provideEvaluatableExpression(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.EvaluatableExpression | undefined> {
+	async provideEvaluatableExpression(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.EvaluatableExpression | undefined> {
 
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideEvaluatableExpression(doc, pos, token)).then(value => {
-			if (value) {
-				return typeConvert.EvaluatableExpression.from(value);
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideEvaluatableExpression(doc, pos, token);
+		if (value) {
+			return typeConvert.EvaluatableExpression.from(value);
+		}
+		return undefined;
 	}
 }
 
@@ -299,14 +298,13 @@ class InlineValuesAdapter {
 		private readonly _provider: vscode.InlineValuesProvider,
 	) { }
 
-	public provideInlineValues(resource: URI, viewPort: IRange, context: extHostProtocol.IInlineValueContextDto, token: CancellationToken): Promise<modes.InlineValue[] | undefined> {
+	async provideInlineValues(resource: URI, viewPort: IRange, context: extHostProtocol.IInlineValueContextDto, token: CancellationToken): Promise<modes.InlineValue[] | undefined> {
 		const doc = this._documents.getDocument(resource);
-		return asPromise(() => this._provider.provideInlineValues(doc, typeConvert.Range.to(viewPort), typeConvert.InlineValueContext.to(context), token)).then(value => {
-			if (Array.isArray(value)) {
-				return value.map(iv => typeConvert.InlineValue.from(iv));
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideInlineValues(doc, typeConvert.Range.to(viewPort), typeConvert.InlineValueContext.to(context), token);
+		if (Array.isArray(value)) {
+			return value.map(iv => typeConvert.InlineValue.from(iv));
+		}
+		return undefined;
 	}
 }
 
@@ -317,17 +315,16 @@ class DocumentHighlightAdapter {
 		private readonly _provider: vscode.DocumentHighlightProvider
 	) { }
 
-	provideDocumentHighlights(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.DocumentHighlight[] | undefined> {
+	async provideDocumentHighlights(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.DocumentHighlight[] | undefined> {
 
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideDocumentHighlights(doc, pos, token)).then(value => {
-			if (Array.isArray(value)) {
-				return value.map(typeConvert.DocumentHighlight.from);
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideDocumentHighlights(doc, pos, token);
+		if (Array.isArray(value)) {
+			return value.map(typeConvert.DocumentHighlight.from);
+		}
+		return undefined;
 	}
 }
 
@@ -337,20 +334,19 @@ class LinkedEditingRangeAdapter {
 		private readonly _provider: vscode.LinkedEditingRangeProvider
 	) { }
 
-	provideLinkedEditingRanges(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LinkedEditingRanges | undefined> {
+	async provideLinkedEditingRanges(resource: URI, position: IPosition, token: CancellationToken): Promise<modes.LinkedEditingRanges | undefined> {
 
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideLinkedEditingRanges(doc, pos, token)).then(value => {
-			if (value && Array.isArray(value.ranges)) {
-				return {
-					ranges: coalesce(value.ranges.map(typeConvert.Range.from)),
-					wordPattern: value.wordPattern
-				};
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideLinkedEditingRanges(doc, pos, token);
+		if (value && Array.isArray(value.ranges)) {
+			return {
+				ranges: coalesce(value.ranges.map(typeConvert.Range.from)),
+				wordPattern: value.wordPattern
+			};
+		}
+		return undefined;
 	}
 }
 
@@ -361,16 +357,15 @@ class ReferenceAdapter {
 		private readonly _provider: vscode.ReferenceProvider
 	) { }
 
-	provideReferences(resource: URI, position: IPosition, context: modes.ReferenceContext, token: CancellationToken): Promise<modes.Location[] | undefined> {
+	async provideReferences(resource: URI, position: IPosition, context: modes.ReferenceContext, token: CancellationToken): Promise<modes.Location[] | undefined> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideReferences(doc, pos, context, token)).then(value => {
-			if (Array.isArray(value)) {
-				return value.map(typeConvert.location.from);
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideReferences(doc, pos, context, token);
+		if (Array.isArray(value)) {
+			return value.map(typeConvert.location.from);
+		}
+		return undefined;
 	}
 }
 
@@ -394,7 +389,7 @@ class CodeActionAdapter {
 		private readonly _apiDeprecation: IExtHostApiDeprecationService,
 	) { }
 
-	provideCodeActions(resource: URI, rangeOrSelection: IRange | ISelection, context: modes.CodeActionContext, token: CancellationToken): Promise<extHostProtocol.ICodeActionListDto | undefined> {
+	async provideCodeActions(resource: URI, rangeOrSelection: IRange | ISelection, context: modes.CodeActionContext, token: CancellationToken): Promise<extHostProtocol.ICodeActionListDto | undefined> {
 
 		const doc = this._documents.getDocument(resource);
 		const ran = Selection.isISelection(rangeOrSelection)
@@ -417,57 +412,52 @@ class CodeActionAdapter {
 			triggerKind: typeConvert.CodeActionTriggerKind.to(context.trigger),
 		};
 
-		return asPromise(() => this._provider.provideCodeActions(doc, ran, codeActionContext, token)).then((commandsOrActions): extHostProtocol.ICodeActionListDto | undefined => {
-			if (!isNonEmptyArray(commandsOrActions) || token.isCancellationRequested) {
-				return undefined;
+		const commandsOrActions = await this._provider.provideCodeActions(doc, ran, codeActionContext, token);
+		if (!isNonEmptyArray(commandsOrActions) || token.isCancellationRequested) {
+			return undefined;
+		}
+		const cacheId = this._cache.add(commandsOrActions);
+		const disposables = new DisposableStore();
+		this._disposables.set(cacheId, disposables);
+		const actions: CustomCodeAction[] = [];
+		for (let i = 0; i < commandsOrActions.length; i++) {
+			const candidate = commandsOrActions[i];
+			if (!candidate) {
+				continue;
 			}
+			if (CodeActionAdapter._isCommand(candidate)) {
+				// old school: synthetic code action
+				this._apiDeprecation.report('CodeActionProvider.provideCodeActions - return commands', this._extension,
+					`Return 'CodeAction' instances instead.`);
 
-			const cacheId = this._cache.add(commandsOrActions);
-			const disposables = new DisposableStore();
-			this._disposables.set(cacheId, disposables);
-
-			const actions: CustomCodeAction[] = [];
-			for (let i = 0; i < commandsOrActions.length; i++) {
-				const candidate = commandsOrActions[i];
-				if (!candidate) {
-					continue;
-				}
-				if (CodeActionAdapter._isCommand(candidate)) {
-					// old school: synthetic code action
-
-					this._apiDeprecation.report('CodeActionProvider.provideCodeActions - return commands', this._extension,
-						`Return 'CodeAction' instances instead.`);
-
-					actions.push({
-						_isSynthetic: true,
-						title: candidate.title,
-						command: this._commands.toInternal(candidate, disposables),
-					});
-				} else {
-					if (codeActionContext.only) {
-						if (!candidate.kind) {
-							this._logService.warn(`${this._extension.identifier.value} - Code actions of kind '${codeActionContext.only.value} 'requested but returned code action does not have a 'kind'. Code action will be dropped. Please set 'CodeAction.kind'.`);
-						} else if (!codeActionContext.only.contains(candidate.kind)) {
-							this._logService.warn(`${this._extension.identifier.value} - Code actions of kind '${codeActionContext.only.value} 'requested but returned code action is of kind '${candidate.kind.value}'. Code action will be dropped. Please check 'CodeActionContext.only' to only return requested code actions.`);
-						}
+				actions.push({
+					_isSynthetic: true,
+					title: candidate.title,
+					command: this._commands.toInternal(candidate, disposables),
+				});
+			} else {
+				if (codeActionContext.only) {
+					if (!candidate.kind) {
+						this._logService.warn(`${this._extension.identifier.value} - Code actions of kind '${codeActionContext.only.value} 'requested but returned code action does not have a 'kind'. Code action will be dropped. Please set 'CodeAction.kind'.`);
+					} else if (!codeActionContext.only.contains(candidate.kind)) {
+						this._logService.warn(`${this._extension.identifier.value} - Code actions of kind '${codeActionContext.only.value} 'requested but returned code action is of kind '${candidate.kind.value}'. Code action will be dropped. Please check 'CodeActionContext.only' to only return requested code actions.`);
 					}
-
-					// new school: convert code action
-					actions.push({
-						cacheId: [cacheId, i],
-						title: candidate.title,
-						command: candidate.command && this._commands.toInternal(candidate.command, disposables),
-						diagnostics: candidate.diagnostics && candidate.diagnostics.map(typeConvert.Diagnostic.from),
-						edit: candidate.edit && typeConvert.WorkspaceEdit.from(candidate.edit),
-						kind: candidate.kind && candidate.kind.value,
-						isPreferred: candidate.isPreferred,
-						disabled: candidate.disabled?.reason
-					});
 				}
-			}
 
-			return { cacheId, actions };
-		});
+				// new school: convert code action
+				actions.push({
+					cacheId: [cacheId, i],
+					title: candidate.title,
+					command: candidate.command && this._commands.toInternal(candidate.command, disposables),
+					diagnostics: candidate.diagnostics && candidate.diagnostics.map(typeConvert.Diagnostic.from),
+					edit: candidate.edit && typeConvert.WorkspaceEdit.from(candidate.edit),
+					kind: candidate.kind && candidate.kind.value,
+					isPreferred: candidate.isPreferred,
+					disabled: candidate.disabled?.reason
+				});
+			}
+		}
+		return { cacheId, actions };
 	}
 
 	public async resolveCodeAction(id: extHostProtocol.ChainedCacheId, token: CancellationToken): Promise<extHostProtocol.IWorkspaceEditDto | undefined> {
@@ -503,16 +493,15 @@ class DocumentFormattingAdapter {
 		private readonly _provider: vscode.DocumentFormattingEditProvider
 	) { }
 
-	provideDocumentFormattingEdits(resource: URI, options: modes.FormattingOptions, token: CancellationToken): Promise<ISingleEditOperation[] | undefined> {
+	async provideDocumentFormattingEdits(resource: URI, options: modes.FormattingOptions, token: CancellationToken): Promise<ISingleEditOperation[] | undefined> {
 
 		const document = this._documents.getDocument(resource);
 
-		return asPromise(() => this._provider.provideDocumentFormattingEdits(document, <any>options, token)).then(value => {
-			if (Array.isArray(value)) {
-				return value.map(typeConvert.TextEdit.from);
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideDocumentFormattingEdits(document, <any>options, token);
+		if (Array.isArray(value)) {
+			return value.map(typeConvert.TextEdit.from);
+		}
+		return undefined;
 	}
 }
 
@@ -523,17 +512,16 @@ class RangeFormattingAdapter {
 		private readonly _provider: vscode.DocumentRangeFormattingEditProvider
 	) { }
 
-	provideDocumentRangeFormattingEdits(resource: URI, range: IRange, options: modes.FormattingOptions, token: CancellationToken): Promise<ISingleEditOperation[] | undefined> {
+	async provideDocumentRangeFormattingEdits(resource: URI, range: IRange, options: modes.FormattingOptions, token: CancellationToken): Promise<ISingleEditOperation[] | undefined> {
 
 		const document = this._documents.getDocument(resource);
 		const ran = typeConvert.Range.to(range);
 
-		return asPromise(() => this._provider.provideDocumentRangeFormattingEdits(document, ran, <any>options, token)).then(value => {
-			if (Array.isArray(value)) {
-				return value.map(typeConvert.TextEdit.from);
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideDocumentRangeFormattingEdits(document, ran, <any>options, token);
+		if (Array.isArray(value)) {
+			return value.map(typeConvert.TextEdit.from);
+		}
+		return undefined;
 	}
 }
 
@@ -546,17 +534,16 @@ class OnTypeFormattingAdapter {
 
 	autoFormatTriggerCharacters: string[] = []; // not here
 
-	provideOnTypeFormattingEdits(resource: URI, position: IPosition, ch: string, options: modes.FormattingOptions, token: CancellationToken): Promise<ISingleEditOperation[] | undefined> {
+	async provideOnTypeFormattingEdits(resource: URI, position: IPosition, ch: string, options: modes.FormattingOptions, token: CancellationToken): Promise<ISingleEditOperation[] | undefined> {
 
 		const document = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideOnTypeFormattingEdits(document, pos, ch, <any>options, token)).then(value => {
-			if (Array.isArray(value)) {
-				return value.map(typeConvert.TextEdit.from);
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideOnTypeFormattingEdits(document, pos, ch, <any>options, token);
+		if (Array.isArray(value)) {
+			return value.map(typeConvert.TextEdit.from);
+		}
+		return undefined;
 	}
 }
 
@@ -570,30 +557,28 @@ class NavigateTypeAdapter {
 		private readonly _logService: ILogService
 	) { }
 
-	provideWorkspaceSymbols(search: string, token: CancellationToken): Promise<extHostProtocol.IWorkspaceSymbolsDto> {
+	async provideWorkspaceSymbols(search: string, token: CancellationToken): Promise<extHostProtocol.IWorkspaceSymbolsDto> {
 		const result: extHostProtocol.IWorkspaceSymbolsDto = extHostProtocol.IdObject.mixin({ symbols: [] });
-		return asPromise(() => this._provider.provideWorkspaceSymbols(search, token)).then(value => {
-			if (isNonEmptyArray(value)) {
-				for (const item of value) {
-					if (!item) {
-						// drop
-						continue;
-					}
-					if (!item.name) {
-						this._logService.warn('INVALID SymbolInformation, lacks name', item);
-						continue;
-					}
-					const symbol = extHostProtocol.IdObject.mixin(typeConvert.WorkspaceSymbol.from(item));
-					this._symbolCache.set(symbol._id!, item);
-					result.symbols.push(symbol);
+		const value = await this._provider.provideWorkspaceSymbols(search, token);
+		if (isNonEmptyArray(value)) {
+			for (const item of value) {
+				if (!item) {
+					// drop
+					continue;
 				}
+				if (!item.name) {
+					this._logService.warn('INVALID SymbolInformation, lacks name', item);
+					continue;
+				}
+				const symbol = extHostProtocol.IdObject.mixin(typeConvert.WorkspaceSymbol.from(item));
+				this._symbolCache.set(symbol._id!, item);
+				result.symbols.push(symbol);
 			}
-		}).then(() => {
-			if (result.symbols.length > 0) {
-				this._resultCache.set(result._id!, [result.symbols[0]._id!, result.symbols[result.symbols.length - 1]._id!]);
-			}
-			return result;
-		});
+		}
+		if (result.symbols.length > 0) {
+			this._resultCache.set(result._id!, [result.symbols[0]._id!, result.symbols[result.symbols.length - 1]._id!]);
+		}
+		return result;
 	}
 
 	async resolveWorkspaceSymbol(symbol: extHostProtocol.IWorkspaceSymbolDto, token: CancellationToken): Promise<extHostProtocol.IWorkspaceSymbolDto | undefined> {
@@ -603,7 +588,7 @@ class NavigateTypeAdapter {
 
 		const item = this._symbolCache.get(symbol._id!);
 		if (item) {
-			const value = await asPromise(() => this._provider.resolveWorkspaceSymbol!(item, token));
+			const value = await this._provider.resolveWorkspaceSymbol(item, token);
 			return value && mixin(symbol, typeConvert.WorkspaceSymbol.from(value), true);
 		}
 		return undefined;
@@ -632,17 +617,19 @@ class RenameAdapter {
 		private readonly _logService: ILogService
 	) { }
 
-	provideRenameEdits(resource: URI, position: IPosition, newName: string, token: CancellationToken): Promise<extHostProtocol.IWorkspaceEditDto | undefined> {
+	async provideRenameEdits(resource: URI, position: IPosition, newName: string, token: CancellationToken): Promise<extHostProtocol.IWorkspaceEditDto | undefined> {
 
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.provideRenameEdits(doc, pos, newName, token)).then(value => {
+		try {
+			const value = await this._provider.provideRenameEdits(doc, pos, newName, token);
 			if (!value) {
 				return undefined;
 			}
 			return typeConvert.WorkspaceEdit.from(value);
-		}, err => {
+
+		} catch (err) {
 			const rejectReason = RenameAdapter._asMessage(err);
 			if (rejectReason) {
 				return <extHostProtocol.IWorkspaceEditDto>{ rejectReason, edits: undefined! };
@@ -650,10 +637,10 @@ class RenameAdapter {
 				// generic error
 				return Promise.reject<extHostProtocol.IWorkspaceEditDto>(err);
 			}
-		});
+		}
 	}
 
-	resolveRenameLocation(resource: URI, position: IPosition, token: CancellationToken): Promise<(modes.RenameLocation & modes.Rejection) | undefined> {
+	async resolveRenameLocation(resource: URI, position: IPosition, token: CancellationToken): Promise<(modes.RenameLocation & modes.Rejection) | undefined> {
 		if (typeof this._provider.prepareRename !== 'function') {
 			return Promise.resolve(undefined);
 		}
@@ -661,7 +648,8 @@ class RenameAdapter {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		return asPromise(() => this._provider.prepareRename!(doc, pos, token)).then(rangeOrLocation => {
+		try {
+			const rangeOrLocation = await this._provider.prepareRename(doc, pos, token);
 
 			let range: vscode.Range | undefined;
 			let text: string | undefined;
@@ -674,7 +662,7 @@ class RenameAdapter {
 				text = rangeOrLocation.placeholder;
 			}
 
-			if (!range) {
+			if (!range || !text) {
 				return undefined;
 			}
 			if (range.start.line > pos.line || range.end.line < pos.line) {
@@ -682,14 +670,15 @@ class RenameAdapter {
 				return undefined;
 			}
 			return { range: typeConvert.Range.from(range), text };
-		}, err => {
+
+		} catch (err) {
 			const rejectReason = RenameAdapter._asMessage(err);
 			if (rejectReason) {
 				return <modes.RenameLocation & modes.Rejection>{ rejectReason, range: undefined!, text: undefined! };
 			} else {
 				return Promise.reject<any>(err);
 			}
-		});
+		}
 	}
 
 	private static _asMessage(err: any): string | undefined {
@@ -729,24 +718,21 @@ export class DocumentSemanticTokensAdapter {
 		this._previousResults = new Map<number, SemanticTokensPreviousResult>();
 	}
 
-	provideDocumentSemanticTokens(resource: URI, previousResultId: number, token: CancellationToken): Promise<VSBuffer | null> {
+	async provideDocumentSemanticTokens(resource: URI, previousResultId: number, token: CancellationToken): Promise<VSBuffer | null> {
 		const doc = this._documents.getDocument(resource);
 		const previousResult = (previousResultId !== 0 ? this._previousResults.get(previousResultId) : null);
-		return asPromise(() => {
-			if (previousResult && typeof previousResult.resultId === 'string' && typeof this._provider.provideDocumentSemanticTokensEdits === 'function') {
-				return this._provider.provideDocumentSemanticTokensEdits(doc, previousResult.resultId, token);
-			}
-			return this._provider.provideDocumentSemanticTokens(doc, token);
-		}).then((value: ProvidedSemanticTokens | ProvidedSemanticTokensEdits | null | undefined) => {
-			if (previousResult) {
-				this._previousResults.delete(previousResultId);
-			}
-			if (!value) {
-				return null;
-			}
-			value = DocumentSemanticTokensAdapter._fixProvidedSemanticTokens(value);
-			return this._send(DocumentSemanticTokensAdapter._convertToEdits(previousResult, value), value);
-		});
+		let value = typeof previousResult?.resultId === 'string' && typeof this._provider.provideDocumentSemanticTokensEdits === 'function'
+			? await this._provider.provideDocumentSemanticTokensEdits(doc, previousResult.resultId, token)
+			: await this._provider.provideDocumentSemanticTokens(doc, token);
+
+		if (previousResult) {
+			this._previousResults.delete(previousResultId);
+		}
+		if (!value) {
+			return null;
+		}
+		value = DocumentSemanticTokensAdapter._fixProvidedSemanticTokens(value);
+		return this._send(DocumentSemanticTokensAdapter._convertToEdits(previousResult, value), value);
 	}
 
 	async releaseDocumentSemanticColoring(semanticColoringResultId: number): Promise<void> {
@@ -863,17 +849,16 @@ export class DocumentRangeSemanticTokensAdapter {
 	) {
 	}
 
-	provideDocumentRangeSemanticTokens(resource: URI, range: IRange, token: CancellationToken): Promise<VSBuffer | null> {
+	async provideDocumentRangeSemanticTokens(resource: URI, range: IRange, token: CancellationToken): Promise<VSBuffer | null> {
 		const doc = this._documents.getDocument(resource);
-		return asPromise(() => this._provider.provideDocumentRangeSemanticTokens(doc, typeConvert.Range.to(range), token)).then(value => {
-			if (!value) {
-				return null;
-			}
-			return this._send(value);
-		});
+		const value = await this._provider.provideDocumentRangeSemanticTokens(doc, typeConvert.Range.to(range), token);
+		if (!value) {
+			return null;
+		}
+		return this._send(value);
 	}
 
-	private _send(value: vscode.SemanticTokens): VSBuffer | null {
+	private _send(value: vscode.SemanticTokens): VSBuffer {
 		return encodeSemanticTokensDto({
 			id: 0,
 			type: 'full',
@@ -911,7 +896,7 @@ class SuggestAdapter {
 		const insertRange = replaceRange.with({ end: pos });
 
 		const sw = new StopWatch(true);
-		const itemsOrList = await asPromise(() => this._provider.provideCompletionItems(doc, pos, token, typeConvert.CompletionContext.to(context)));
+		const itemsOrList = await this._provider.provideCompletionItems(doc, pos, token, typeConvert.CompletionContext.to(context));
 
 		if (!itemsOrList) {
 			// undefined and null are valid results
@@ -961,7 +946,7 @@ class SuggestAdapter {
 			return undefined;
 		}
 
-		const resolvedItem = await asPromise(() => this._provider.resolveCompletionItem!(item, token));
+		const resolvedItem = await this._provider.resolveCompletionItem!(item, token);
 
 		if (!resolvedItem) {
 			return undefined;
@@ -1052,7 +1037,7 @@ class InlineCompletionAdapter {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 
-		const result = await asPromise(() => this._provider.provideInlineCompletionItems(doc, pos, context, token));
+		const result = await this._provider.provideInlineCompletionItems(doc, pos, context, token);
 
 		if (!result) {
 			// undefined and null are valid results
@@ -1140,18 +1125,17 @@ class SignatureHelpAdapter {
 		private readonly _provider: vscode.SignatureHelpProvider,
 	) { }
 
-	provideSignatureHelp(resource: URI, position: IPosition, context: extHostProtocol.ISignatureHelpContextDto, token: CancellationToken): Promise<extHostProtocol.ISignatureHelpDto | undefined> {
+	async provideSignatureHelp(resource: URI, position: IPosition, context: extHostProtocol.ISignatureHelpContextDto, token: CancellationToken): Promise<extHostProtocol.ISignatureHelpDto | undefined> {
 		const doc = this._documents.getDocument(resource);
 		const pos = typeConvert.Position.to(position);
 		const vscodeContext = this.reviveContext(context);
 
-		return asPromise(() => this._provider.provideSignatureHelp(doc, pos, token, vscodeContext)).then(value => {
-			if (value) {
-				const id = this._cache.add([value]);
-				return { ...typeConvert.SignatureHelp.from(value), id };
-			}
-			return undefined;
-		});
+		const value = await this._provider.provideSignatureHelp(doc, pos, token, vscodeContext);
+		if (value) {
+			const id = this._cache.add([value]);
+			return { ...typeConvert.SignatureHelp.from(value), id };
+		}
+		return undefined;
 	}
 
 	private reviveContext(context: extHostProtocol.ISignatureHelpContextDto): vscode.SignatureHelpContext {
@@ -1181,11 +1165,10 @@ class InlayHintsAdapter {
 		private readonly _provider: vscode.InlayHintsProvider,
 	) { }
 
-	provideInlayHints(resource: URI, range: IRange, token: CancellationToken): Promise<extHostProtocol.IInlayHintsDto | undefined> {
+	async provideInlayHints(resource: URI, range: IRange, token: CancellationToken): Promise<extHostProtocol.IInlayHintsDto | undefined> {
 		const doc = this._documents.getDocument(resource);
-		return asPromise(() => this._provider.provideInlayHints(doc, typeConvert.Range.to(range), token)).then(value => {
-			return value ? { hints: value.map(typeConvert.InlayHint.from) } : undefined;
-		});
+		const value = await this._provider.provideInlayHints(doc, typeConvert.Range.to(range), token);
+		return value ? { hints: value.map(typeConvert.InlayHint.from) } : undefined;
 	}
 }
 
@@ -1201,7 +1184,7 @@ class LinkProviderAdapter {
 	async provideLinks(resource: URI, token: CancellationToken): Promise<extHostProtocol.ILinksListDto | undefined> {
 		const doc = this._documents.getDocument(resource);
 
-		const links = await asPromise(() => this._provider.provideDocumentLinks(doc, token));
+		const links = await this._provider.provideDocumentLinks(doc, token);
 		if (!Array.isArray(links) || links.length === 0) {
 			// bad result
 			return undefined;
@@ -1249,7 +1232,7 @@ class LinkProviderAdapter {
 		if (!item) {
 			return undefined;
 		}
-		const link = await asPromise(() => this._provider.resolveDocumentLink!(item, token));
+		const link = await this._provider.resolveDocumentLink!(item, token);
 		if (!link || !LinkProviderAdapter._validateLink(link)) {
 			return undefined;
 		}
@@ -1268,34 +1251,30 @@ class ColorProviderAdapter {
 		private _provider: vscode.DocumentColorProvider
 	) { }
 
-	provideColors(resource: URI, token: CancellationToken): Promise<extHostProtocol.IRawColorInfo[]> {
+	async provideColors(resource: URI, token: CancellationToken): Promise<extHostProtocol.IRawColorInfo[]> {
 		const doc = this._documents.getDocument(resource);
-		return asPromise(() => this._provider.provideDocumentColors(doc, token)).then(colors => {
-			if (!Array.isArray(colors)) {
-				return [];
-			}
-
-			const colorInfos: extHostProtocol.IRawColorInfo[] = colors.map(ci => {
-				return {
-					color: typeConvert.Color.from(ci.color),
-					range: typeConvert.Range.from(ci.range)
-				};
-			});
-
-			return colorInfos;
+		const colors = await this._provider.provideDocumentColors(doc, token);
+		if (!Array.isArray(colors)) {
+			return [];
+		}
+		const colorInfos: extHostProtocol.IRawColorInfo[] = colors.map(ci => {
+			return {
+				color: typeConvert.Color.from(ci.color),
+				range: typeConvert.Range.from(ci.range)
+			};
 		});
+		return colorInfos;
 	}
 
-	provideColorPresentations(resource: URI, raw: extHostProtocol.IRawColorInfo, token: CancellationToken): Promise<modes.IColorPresentation[] | undefined> {
+	async provideColorPresentations(resource: URI, raw: extHostProtocol.IRawColorInfo, token: CancellationToken): Promise<modes.IColorPresentation[] | undefined> {
 		const document = this._documents.getDocument(resource);
 		const range = typeConvert.Range.to(raw.range);
 		const color = typeConvert.Color.to(raw.color);
-		return asPromise(() => this._provider.provideColorPresentations(color, { document, range }, token)).then(value => {
-			if (!Array.isArray(value)) {
-				return undefined;
-			}
-			return value.map(typeConvert.ColorPresentation.from);
-		});
+		const value = await this._provider.provideColorPresentations(color, { document, range }, token);
+		if (!Array.isArray(value)) {
+			return undefined;
+		}
+		return value.map(typeConvert.ColorPresentation.from);
 	}
 }
 
@@ -1306,14 +1285,13 @@ class FoldingProviderAdapter {
 		private _provider: vscode.FoldingRangeProvider
 	) { }
 
-	provideFoldingRanges(resource: URI, context: modes.FoldingContext, token: CancellationToken): Promise<modes.FoldingRange[] | undefined> {
+	async provideFoldingRanges(resource: URI, context: modes.FoldingContext, token: CancellationToken): Promise<modes.FoldingRange[] | undefined> {
 		const doc = this._documents.getDocument(resource);
-		return asPromise(() => this._provider.provideFoldingRanges(doc, context, token)).then(ranges => {
-			if (!Array.isArray(ranges)) {
-				return undefined;
-			}
-			return ranges.map(typeConvert.FoldingRange.from);
-		});
+		const ranges = await this._provider.provideFoldingRanges(doc, context, token);
+		if (!Array.isArray(ranges)) {
+			return undefined;
+		}
+		return ranges.map(typeConvert.FoldingRange.from);
 	}
 }
 
@@ -1325,41 +1303,39 @@ class SelectionRangeAdapter {
 		private readonly _logService: ILogService
 	) { }
 
-	provideSelectionRanges(resource: URI, pos: IPosition[], token: CancellationToken): Promise<modes.SelectionRange[][]> {
+	async provideSelectionRanges(resource: URI, pos: IPosition[], token: CancellationToken): Promise<modes.SelectionRange[][]> {
 		const document = this._documents.getDocument(resource);
 		const positions = pos.map(typeConvert.Position.to);
 
-		return asPromise(() => this._provider.provideSelectionRanges(document, positions, token)).then(allProviderRanges => {
-			if (!isNonEmptyArray(allProviderRanges)) {
-				return [];
-			}
-			if (allProviderRanges.length !== positions.length) {
-				this._logService.warn('BAD selection ranges, provider must return ranges for each position');
-				return [];
-			}
+		const allProviderRanges = await this._provider.provideSelectionRanges(document, positions, token);
+		if (!isNonEmptyArray(allProviderRanges)) {
+			return [];
+		}
+		if (allProviderRanges.length !== positions.length) {
+			this._logService.warn('BAD selection ranges, provider must return ranges for each position');
+			return [];
+		}
+		const allResults: modes.SelectionRange[][] = [];
+		for (let i = 0; i < positions.length; i++) {
+			const oneResult: modes.SelectionRange[] = [];
+			allResults.push(oneResult);
 
-			const allResults: modes.SelectionRange[][] = [];
-			for (let i = 0; i < positions.length; i++) {
-				const oneResult: modes.SelectionRange[] = [];
-				allResults.push(oneResult);
+			let last: vscode.Position | vscode.Range = positions[i];
+			let selectionRange = allProviderRanges[i];
 
-				let last: vscode.Position | vscode.Range = positions[i];
-				let selectionRange = allProviderRanges[i];
-
-				while (true) {
-					if (!selectionRange.range.contains(last)) {
-						throw new Error('INVALID selection range, must contain the previous range');
-					}
-					oneResult.push(typeConvert.SelectionRange.from(selectionRange));
-					if (!selectionRange.parent) {
-						break;
-					}
-					last = selectionRange.range;
-					selectionRange = selectionRange.parent;
+			while (true) {
+				if (!selectionRange.range.contains(last)) {
+					throw new Error('INVALID selection range, must contain the previous range');
 				}
+				oneResult.push(typeConvert.SelectionRange.from(selectionRange));
+				if (!selectionRange.parent) {
+					break;
+				}
+				last = selectionRange.range;
+				selectionRange = selectionRange.parent;
 			}
-			return allResults;
-		});
+		}
+		return allResults;
 	}
 }
 
diff --git a/yarn.lock b/yarn.lock
index 62c3a19de68..d3bb4bbfb18 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9819,10 +9819,10 @@ v8-compile-cache@^2.0.3, v8-compile-cache@^2.1.1:
   resolved "https://registry.yarnpkg.com/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz#9471efa3ef9128d2f7c6a7ca39c4dd6b5055b132"
   integrity sha512-gTpR5XQNKFwOd4clxfnhaqvfqMpqEwr4tOtCyz4MtYZX2JYhfr1JvBFKdS+7K/9rfpZR3VLX+YWBbKoxCgS43Q==
 
-v8-inspect-profiler@^0.0.21:
-  version "0.0.21"
-  resolved "https://registry.yarnpkg.com/v8-inspect-profiler/-/v8-inspect-profiler-0.0.21.tgz#2ded4fd59508f52d5887d3ae2bbace3e33509c41"
-  integrity sha512-6lo22vhua2Zg2Cq8Wtc2FELlTA+pmu+5epyPX65jNVAbAoKXY/XI3t33CreYiK8THKgkMeoWeviAxcJaefjyrg==
+v8-inspect-profiler@^0.0.22:
+  version "0.0.22"
+  resolved "https://registry.yarnpkg.com/v8-inspect-profiler/-/v8-inspect-profiler-0.0.22.tgz#34d3ba35a965c437ed28279d31cd42d7698a4002"
+  integrity sha512-r2p7UkbFlFopAWUVprbECP+EpdjuEKPFQLhqpnHx9KxeTTLVaHuGpUNHye53MtYMoJFl9nJiMyIM7J2yY+dTQg==
   dependencies:
     chrome-remote-interface "0.28.2"