diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index cf02afe365ee275b7890d75215439c834e7c6c5e..a2b3112bc8076502f2a1dca318ce663979eb605a 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -3413,15 +3413,17 @@ declare module 'vscode' {
 		insertText?: string | SnippetString;
 
 		/**
-		 * A range of text that should be replaced by this completion item.
+		 * A range or a insert and replace range selecting the text that should be replaced by this completion item.
 		 *
-		 * Defaults to a range from the start of the [current word](#TextDocument.getWordRangeAtPosition) to the
-		 * current position.
+		 * When omitted, the range of the [current word](#TextDocument.getWordRangeAtPosition) is used as replace-range
+		 * and as insert-range the start of the [current word](#TextDocument.getWordRangeAtPosition) to the
+		 * current position is used.
 		 *
-		 * *Note:* The range must be a [single line](#Range.isSingleLine) and it must
+		 * *Note 1:* A range must be a [single line](#Range.isSingleLine) and it must
 		 * [contain](#Range.contains) the position at which completion has been [requested](#CompletionItemProvider.provideCompletionItems).
+		 * *Note 2:* A insert range must be a prefix of a replace range, that means it must be contained and starting at the same position.
 		 */
-		range?: Range;
+		range?: Range | { inserting: Range; replacing: Range; };
 
 		/**
 		 * An optional set of characters that when pressed while this completion is active will accept it first and
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index c6103fbe208749ee3207cfb3efd7fb89d2511e47..0de7f957f3f1f08156f9204969b9d6f7e595fca2 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1285,25 +1285,6 @@ declare module 'vscode' {
 
 	//#endregion
 
-	//#region insert/replace completions: https://github.com/microsoft/vscode/issues/10266
-
-	export interface CompletionItem {
-
-		/**
-		 * A range or a insert and replace range selecting the text that should be replaced by this completion item.
-		 *
-		 * When omitted, the range of the [current word](#TextDocument.getWordRangeAtPosition) is used as replace-range
-		 * and as insert-range the start of the [current word](#TextDocument.getWordRangeAtPosition) to the
-		 * current position is used.
-		 *
-		 * *Note 1:* A range must be a [single line](#Range.isSingleLine) and it must
-		 * [contain](#Range.contains) the position at which completion has been [requested](#CompletionItemProvider.provideCompletionItems).
-		 * *Note 2:* A insert range must be a prefix of a replace range, that means it must be contained and starting at the same position.
-		 */
-		range2?: Range | { inserting: Range; replacing: Range; };
-	}
-
-	//#endregion
 
 	//#region allow QuickPicks to skip sorting: https://github.com/microsoft/vscode/issues/73904
 
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index 20cc1a12f77d244fc0b3abbdb3f2ea8dcfc27fc3..f3cb6fade937de784f85437671da19003150e3d6 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -918,8 +918,6 @@ class SuggestAdapter {
 			range = item.textEdit.range;
 		} else if (item.range) {
 			range = item.range;
-		} else if (item.range2) {
-			range = item.range2;
 		}
 
 		if (range) {
@@ -955,12 +953,12 @@ class SuggestAdapter {
 	}
 
 	private static _mustNotChangeHash(item: vscode.CompletionItem) {
-		const res = JSON.stringify([item.label, item.sortText, item.filterText, item.insertText, item.range, item.range2]);
+		const res = JSON.stringify([item.label, item.sortText, item.filterText, item.insertText, item.range]);
 		return res;
 	}
 
 	private static _mustNotChangeDiff(hash: string, item: vscode.CompletionItem): string | void {
-		const thisArr = [item.label, item.sortText, item.filterText, item.insertText, item.range, item.range2];
+		const thisArr = [item.label, item.sortText, item.filterText, item.insertText, item.range];
 		const thisHash = JSON.stringify(thisArr);
 		if (hash === thisHash) {
 			return;
diff --git a/src/vs/workbench/api/common/extHostTypeConverters.ts b/src/vs/workbench/api/common/extHostTypeConverters.ts
index 093a3219eb5aa092b4c7a46b1cd020d01c208f97..6875799dc6983e28f6c618444c7e9ba53410c4c5 100644
--- a/src/vs/workbench/api/common/extHostTypeConverters.ts
+++ b/src/vs/workbench/api/common/extHostTypeConverters.ts
@@ -842,8 +842,14 @@ export namespace CompletionItem {
 		result.filterText = suggestion.filterText;
 		result.preselect = suggestion.preselect;
 		result.commitCharacters = suggestion.commitCharacters;
-		result.range = editorRange.Range.isIRange(suggestion.range) ? Range.to(suggestion.range) : undefined;
-		result.range2 = editorRange.Range.isIRange(suggestion.range) ? undefined : { inserting: Range.to(suggestion.range.insert), replacing: Range.to(suggestion.range.replace) };
+
+		// range
+		if (editorRange.Range.isIRange(suggestion.range)) {
+			result.range = Range.to(suggestion.range);
+		} else if (typeof suggestion.range === 'object') {
+			result.range = { inserting: Range.to(suggestion.range.insert), replacing: Range.to(suggestion.range.replace) };
+		}
+
 		result.keepWhitespace = typeof suggestion.insertTextRules === 'undefined' ? false : Boolean(suggestion.insertTextRules & modes.CompletionItemInsertTextRule.KeepWhitespace);
 		// 'insertText'-logic
 		if (typeof suggestion.insertTextRules !== 'undefined' && suggestion.insertTextRules & modes.CompletionItemInsertTextRule.InsertAsSnippet) {
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index eeb89627d62607b128df599ecf66a082fb2c3732..037eb2b99a4e0fb6ccb34ef102fb878306b3661e 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1364,8 +1364,7 @@ export class CompletionItem implements vscode.CompletionItem {
 	preselect?: boolean;
 	insertText?: string | SnippetString;
 	keepWhitespace?: boolean;
-	range?: Range;
-	range2?: Range | { inserting: Range; replacing: Range; };
+	range?: Range | { inserting: Range; replacing: Range; };
 	commitCharacters?: string[];
 	textEdit?: TextEdit;
 	additionalTextEdits?: TextEdit[];