diff --git a/package.json b/package.json
index 9dd958c4..3d5f2fab 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@microsoft/powerquery-parser",
-    "version": "0.15.8",
+    "version": "0.15.9",
     "description": "A parser for the Power Query/M formula language.",
     "author": "Microsoft",
     "license": "MIT",
@@ -57,4 +57,4 @@
     "files": [
         "lib/powerquery-parser/**/*"
     ]
-}
\ No newline at end of file
+}
diff --git a/src/powerquery-parser/common/partialResult/partialResult.ts b/src/powerquery-parser/common/partialResult/partialResult.ts
index 9f1013c3..8a9d2c11 100644
--- a/src/powerquery-parser/common/partialResult/partialResult.ts
+++ b/src/powerquery-parser/common/partialResult/partialResult.ts
@@ -33,7 +33,7 @@ export type PartialResult<Ok, Partial, Error> =
     | PartialResultIncomplete<Partial>
     | PartialResultError<Error>;
 
-export const enum PartialResultKind {
+export enum PartialResultKind {
     Ok = "Ok",
     Incomplete = "Incomplete",
     Error = "Error",
diff --git a/src/powerquery-parser/common/result/result.ts b/src/powerquery-parser/common/result/result.ts
index c1e262df..9fb094b3 100644
--- a/src/powerquery-parser/common/result/result.ts
+++ b/src/powerquery-parser/common/result/result.ts
@@ -3,7 +3,7 @@
 
 export type Result<T, E> = OkResult<T> | ErrorResult<E>;
 
-export const enum ResultKind {
+export enum ResultKind {
     Ok = "Ok",
     Error = "Error",
 }
diff --git a/src/powerquery-parser/common/stringUtils.ts b/src/powerquery-parser/common/stringUtils.ts
index 375c1f44..002f9370 100644
--- a/src/powerquery-parser/common/stringUtils.ts
+++ b/src/powerquery-parser/common/stringUtils.ts
@@ -14,7 +14,7 @@ export interface FoundQuotes {
     readonly quoteLength: number;
 }
 
-export const enum NewlineKind {
+export enum NewlineKind {
     SingleCharacter = "SingleCharacter",
     DoubleCharacter = "DoubleCharacter", // CARRIAGE RETURN + LINE FEED
 }
diff --git a/src/powerquery-parser/common/trace.ts b/src/powerquery-parser/common/trace.ts
index faf9dc8a..6a75150b 100644
--- a/src/powerquery-parser/common/trace.ts
+++ b/src/powerquery-parser/common/trace.ts
@@ -40,7 +40,7 @@ import performanceNow = require("performance-now");
 // foobar(10);
 
 // Constants used in multiple files as part of a trace's phase/task/message/details.
-export const enum TraceConstant {
+export enum TraceConstant {
     CorrelationId = "CorrelationId",
     Empty = "[Empty]",
     Entry = "Entry",
diff --git a/src/powerquery-parser/common/traversal.ts b/src/powerquery-parser/common/traversal.ts
index 61928837..22c413cc 100644
--- a/src/powerquery-parser/common/traversal.ts
+++ b/src/powerquery-parser/common/traversal.ts
@@ -29,7 +29,7 @@ export type TExpandNodesFn<State extends ITraversalState<ResultType>, ResultType
     collection: NodesById,
 ) => Promise<ReadonlyArray<Node>>;
 
-export const enum VisitNodeStrategy {
+export enum VisitNodeStrategy {
     BreadthFirst = "BreadthFirst",
     DepthFirst = "DepthFirst",
 }
diff --git a/src/powerquery-parser/language/ast/ast.ts b/src/powerquery-parser/language/ast/ast.ts
index fdb772f0..927796d3 100644
--- a/src/powerquery-parser/language/ast/ast.ts
+++ b/src/powerquery-parser/language/ast/ast.ts
@@ -4,7 +4,7 @@
 import { Constant } from "..";
 import { TokenRange } from "../token";
 
-export const enum NodeKind {
+export enum NodeKind {
     ArithmeticExpression = "ArithmeticExpression",
     ArrayWrapper = "ArrayWrapper",
     AsExpression = "AsExpression",
@@ -355,7 +355,7 @@ export type TPrimaryExpression =
 // ---------- 12.2.3.11 Literal expression ----------
 // --------------------------------------------------
 
-export const enum LiteralKind {
+export enum LiteralKind {
     List = "List",
     Logical = "Logical",
     Null = "Null",
@@ -557,7 +557,7 @@ export type ErrorRaisingExpression = IPairedConstant<
 // ---------- 12.2.3.27 Error handling expression ----------
 // ---------------------------------------------------------
 
-export const enum ErrorHandlerKind {
+export enum ErrorHandlerKind {
     Catch = "Catch",
     Otherwise = "Otherwise",
 }
@@ -883,7 +883,7 @@ export interface Identifier extends INode {
     readonly identifierContextKind: IdentifierContextKind;
 }
 
-export const enum IdentifierContextKind {
+export enum IdentifierContextKind {
     Key = "Key",
     Keyword = "Keyword",
     Parameter = "Parameter",
diff --git a/src/powerquery-parser/language/comment.ts b/src/powerquery-parser/language/comment.ts
index fdbb08ed..1a2dcb68 100644
--- a/src/powerquery-parser/language/comment.ts
+++ b/src/powerquery-parser/language/comment.ts
@@ -5,7 +5,7 @@ import { TokenPosition } from "./token";
 
 export type TComment = LineComment | MultilineComment;
 
-export const enum CommentKind {
+export enum CommentKind {
     Line = "Line",
     Multiline = "Multiline",
 }
diff --git a/src/powerquery-parser/language/constant/constant.ts b/src/powerquery-parser/language/constant/constant.ts
index bb269f96..8c01dd73 100644
--- a/src/powerquery-parser/language/constant/constant.ts
+++ b/src/powerquery-parser/language/constant/constant.ts
@@ -27,13 +27,13 @@ export type TBinOpExpressionOperator =
 // ---------- const enums ----------
 // ---------------------------------
 
-export const enum LanguageConstant {
+export enum LanguageConstant {
     Catch = "catch",
     Nullable = "nullable",
     Optional = "optional",
 }
 
-export const enum KeywordConstant {
+export enum KeywordConstant {
     As = "as",
     Each = "each",
     Else = "else",
@@ -54,7 +54,7 @@ export const enum KeywordConstant {
 }
 
 // Mostly direct mappings from their respective TokenKind
-export const enum MiscConstant {
+export enum MiscConstant {
     Ampersand = "&",
     AtSign = "@",
     Comma = ",",
@@ -67,7 +67,7 @@ export const enum MiscConstant {
     QuestionMark = "?",
 }
 
-export const enum PrimitiveTypeConstant {
+export enum PrimitiveTypeConstant {
     Action = "action",
     Any = "any",
     AnyNonNull = "anynonnull",
@@ -89,7 +89,7 @@ export const enum PrimitiveTypeConstant {
     Type = "type",
 }
 
-export const enum WrapperConstant {
+export enum WrapperConstant {
     LeftBrace = "{",
     LeftBracket = "[",
     LeftParenthesis = "(",
@@ -102,7 +102,7 @@ export const enum WrapperConstant {
 // ---------- operator const enums ----------
 // ------------------------------------------
 
-export const enum ArithmeticOperator {
+export enum ArithmeticOperator {
     Multiplication = "*",
     Division = "/",
     Addition = "+",
@@ -110,24 +110,24 @@ export const enum ArithmeticOperator {
     And = "&",
 }
 
-export const enum EqualityOperator {
+export enum EqualityOperator {
     EqualTo = "=",
     NotEqualTo = "<>",
 }
 
-export const enum LogicalOperator {
+export enum LogicalOperator {
     And = "and",
     Or = "or",
 }
 
-export const enum RelationalOperator {
+export enum RelationalOperator {
     LessThan = "<",
     LessThanEqualTo = "<=",
     GreaterThan = ">",
     GreaterThanEqualTo = ">=",
 }
 
-export const enum UnaryOperator {
+export enum UnaryOperator {
     Positive = "+",
     Negative = "-",
     Not = "not",
diff --git a/src/powerquery-parser/language/keyword/keyword.ts b/src/powerquery-parser/language/keyword/keyword.ts
index aa840e8b..b541e7a3 100644
--- a/src/powerquery-parser/language/keyword/keyword.ts
+++ b/src/powerquery-parser/language/keyword/keyword.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-export const enum KeywordKind {
+export enum KeywordKind {
     And = "and",
     As = "as",
     Each = "each",
diff --git a/src/powerquery-parser/language/textUtils.ts b/src/powerquery-parser/language/textUtils.ts
index 62f2780d..058e3483 100644
--- a/src/powerquery-parser/language/textUtils.ts
+++ b/src/powerquery-parser/language/textUtils.ts
@@ -3,7 +3,7 @@
 
 import { Assert, Pattern, StringUtils } from "../common";
 
-export const enum IdentifierKind {
+export enum IdentifierKind {
     Generalized = "Generalized",
     Invalid = "Invalid",
     Quote = "Quote",
diff --git a/src/powerquery-parser/language/token.ts b/src/powerquery-parser/language/token.ts
index 3dbd732e..44454f5a 100644
--- a/src/powerquery-parser/language/token.ts
+++ b/src/powerquery-parser/language/token.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-export const enum LineTokenKindAdditions {
+export enum LineTokenKindAdditions {
     LineComment = "LineComment",
     MultilineComment = "MultilineComment",
     MultilineCommentContent = "MultilineCommentContent",
@@ -15,7 +15,7 @@ export const enum LineTokenKindAdditions {
     QuotedIdentifierStart = "QuotedIdentifierStart",
 }
 
-export const enum TokenKind {
+export enum TokenKind {
     Ampersand = "Ampersand",
     Asterisk = "Asterisk",
     AtSign = "AtSign",
@@ -80,7 +80,7 @@ export const enum TokenKind {
     TextLiteral = "TextLiteral",
 }
 
-export const enum LineTokenKind {
+export enum LineTokenKind {
     Ampersand = TokenKind.Ampersand,
     Asterisk = TokenKind.Asterisk,
     AtSign = TokenKind.AtSign,
diff --git a/src/powerquery-parser/language/type/type.ts b/src/powerquery-parser/language/type/type.ts
index 175e2bf7..af157241 100644
--- a/src/powerquery-parser/language/type/type.ts
+++ b/src/powerquery-parser/language/type/type.ts
@@ -116,7 +116,7 @@ export type TFields = OrderedFields | UnorderedFields;
 export type OrderedFields = OrderedMap<string, TPowerQueryType>;
 export type UnorderedFields = Map<string, TPowerQueryType>;
 
-export const enum TypeKind {
+export enum TypeKind {
     Any = "Any",
     AnyNonNull = "AnyNonNull",
     Binary = "Binary",
@@ -168,7 +168,7 @@ export const TypeKinds: ReadonlyArray<TypeKind> = [
     TypeKind.Type,
 ];
 
-export const enum ExtendedTypeKind {
+export enum ExtendedTypeKind {
     // In Power Query if you want a union type, such as when a function returns either a `text` OR a `number`,
     // then you're only option is to give it the 'any' type.
     // This is a narrower definition which restricts that typing to the union `text | number`.
diff --git a/src/powerquery-parser/language/type/typeUtils/typeTraceConstant.ts b/src/powerquery-parser/language/type/typeUtils/typeTraceConstant.ts
index 40e6ed46..fae6b94d 100644
--- a/src/powerquery-parser/language/type/typeUtils/typeTraceConstant.ts
+++ b/src/powerquery-parser/language/type/typeUtils/typeTraceConstant.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-export const enum TypeUtilsTraceConstant {
+export enum TypeUtilsTraceConstant {
     AnyUnion = "CreateAnyUnion",
     Categorize = "Categorize",
     IsCompatible = "IsCompatible",
diff --git a/src/powerquery-parser/lexer/error.ts b/src/powerquery-parser/lexer/error.ts
index 3d76b744..20269146 100644
--- a/src/powerquery-parser/lexer/error.ts
+++ b/src/powerquery-parser/lexer/error.ts
@@ -18,14 +18,14 @@ export type TInnerLexError =
     | UnexpectedReadError
     | UnterminatedMultilineTokenError;
 
-export const enum BadLineNumberKind {
+export enum BadLineNumberKind {
     LessThanZero = "LessThanZero",
     GreaterThanNumLines = "GreaterThanNumLines",
 }
 
 // do not these sort variants,
 // they are in order that logical checks are made, which in turn help create logical variants
-export const enum BadRangeKind {
+export enum BadRangeKind {
     SameLine_LineCodeUnitStart_Higher = "SameLine_LineCodeUnitStart_Higher",
     LineNumberStart_GreaterThan_LineNumberEnd = "LineNumberStart_GreaterThan_LineNumberEnd",
     LineNumberStart_LessThan_Zero = "LineNumberStart_LessThan_Zero",
@@ -35,13 +35,13 @@ export const enum BadRangeKind {
     LineCodeUnitEnd_GreaterThan_LineLength = "LineCodeUnitEnd_GreaterThan_LineLength",
 }
 
-export const enum ExpectedKind {
+export enum ExpectedKind {
     HexLiteral = "HexLiteral",
     KeywordOrIdentifier = "KeywordOrIdentifier",
     Numeric = "Numeric",
 }
 
-export const enum UnterminatedMultilineTokenKind {
+export enum UnterminatedMultilineTokenKind {
     MultilineComment = "MultilineComment",
     QuotedIdentifier = "QuotedIdentifier",
     Text = "Text",
diff --git a/src/powerquery-parser/lexer/lexer.ts b/src/powerquery-parser/lexer/lexer.ts
index 332c09f4..3e7e0af5 100644
--- a/src/powerquery-parser/lexer/lexer.ts
+++ b/src/powerquery-parser/lexer/lexer.ts
@@ -40,7 +40,7 @@ export type TLine = TouchedLine | UntouchedLine | TouchedWithErrorLine | ErrorLi
 
 export type TErrorLine = ErrorLine | TouchedWithErrorLine;
 
-export const enum LineKind {
+export enum LineKind {
     Error = "Error",
     Touched = "Touched",
     TouchedWithError = "TouchedWithError",
@@ -53,7 +53,7 @@ export const enum LineKind {
 //  * Continuation of a multiline token (eg. multiline comment)
 //
 // All LineModes other than Default are a type of multiline tokenization.
-export const enum LineMode {
+export enum LineMode {
     Comment = "Comment",
     Default = "Default",
     QuotedIdentifier = "QuotedIdentifier",
diff --git a/src/powerquery-parser/localization/locale.ts b/src/powerquery-parser/localization/locale.ts
index 1d0d02ec..89717819 100644
--- a/src/powerquery-parser/localization/locale.ts
+++ b/src/powerquery-parser/localization/locale.ts
@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
 
-export const enum Locale {
+export enum Locale {
     bg_BG = "bg-BG",
     ca_EZ = "ca-EZ",
     cs_CZ = "cs-CZ",
diff --git a/src/powerquery-parser/parser/disambiguation/disambiguation.ts b/src/powerquery-parser/parser/disambiguation/disambiguation.ts
index 033b4296..9af74dff 100644
--- a/src/powerquery-parser/parser/disambiguation/disambiguation.ts
+++ b/src/powerquery-parser/parser/disambiguation/disambiguation.ts
@@ -10,18 +10,18 @@ export type TAmbiguousBracketNode = Ast.FieldProjection | Ast.FieldSelector | As
 
 export type TAmbiguousParenthesisNode = Ast.FunctionExpression | Ast.ParenthesizedExpression | Ast.TLogicalExpression;
 
-export const enum DismabiguationBehavior {
+export enum DismabiguationBehavior {
     Strict = "Strict",
     Thorough = "Thorough",
 }
 
-export const enum BracketDisambiguation {
+export enum BracketDisambiguation {
     FieldProjection = "FieldProjection",
     FieldSelection = "FieldSelection",
     RecordExpression = "RecordExpression",
 }
 
-export const enum ParenthesisDisambiguation {
+export enum ParenthesisDisambiguation {
     FunctionExpression = "FunctionExpression",
     ParenthesizedExpression = "ParenthesizedExpression",
 }
diff --git a/src/powerquery-parser/parser/error.ts b/src/powerquery-parser/parser/error.ts
index 5d10d5d1..00a9c6d9 100644
--- a/src/powerquery-parser/parser/error.ts
+++ b/src/powerquery-parser/parser/error.ts
@@ -20,12 +20,12 @@ export type TInnerParseError =
     | UnterminatedSequence
     | UnusedTokensRemainError;
 
-export const enum CsvContinuationKind {
+export enum CsvContinuationKind {
     DanglingComma = "DanglingComma",
     LetExpression = "LetExpression",
 }
 
-export const enum SequenceKind {
+export enum SequenceKind {
     Bracket = "Bracket",
     Parenthesis = "Parenthesis",
 }
diff --git a/src/powerquery-parser/parser/nodeIdMap/nodeIdMapIterator.ts b/src/powerquery-parser/parser/nodeIdMap/nodeIdMapIterator.ts
index b0de137c..918f16ad 100644
--- a/src/powerquery-parser/parser/nodeIdMap/nodeIdMapIterator.ts
+++ b/src/powerquery-parser/parser/nodeIdMap/nodeIdMapIterator.ts
@@ -35,7 +35,7 @@ export interface SectionKeyValuePair extends IKeyValuePair<Ast.Identifier> {
     readonly pairKind: PairKind.SectionMember;
 }
 
-export const enum PairKind {
+export enum PairKind {
     FieldSpecification = "RecordType",
     LetExpression = "LetExpression",
     Record = "Record",
diff --git a/src/powerquery-parser/parser/nodeIdMap/xorNode.ts b/src/powerquery-parser/parser/nodeIdMap/xorNode.ts
index 372c9766..54d75e32 100644
--- a/src/powerquery-parser/parser/nodeIdMap/xorNode.ts
+++ b/src/powerquery-parser/parser/nodeIdMap/xorNode.ts
@@ -4,7 +4,7 @@
 import { Ast } from "../../language";
 import { ParseContext } from "..";
 
-export const enum XorNodeKind {
+export enum XorNodeKind {
     Ast = "Ast",
     Context = "Context",
 }
diff --git a/src/powerquery-parser/parser/parsers/combinatorialParserV2/commonTypes.ts b/src/powerquery-parser/parser/parsers/combinatorialParserV2/commonTypes.ts
index b8e1ac09..5589387c 100644
--- a/src/powerquery-parser/parser/parsers/combinatorialParserV2/commonTypes.ts
+++ b/src/powerquery-parser/parser/parsers/combinatorialParserV2/commonTypes.ts
@@ -5,7 +5,7 @@ import { Ast } from "../../../language";
 
 export type TOperand = Ast.TBinOpExpression | Ast.TUnaryExpression | Ast.TNullablePrimitiveType;
 
-export const enum CombinatorialParserV2TraceConstant {
+export enum CombinatorialParserV2TraceConstant {
     CombinatorialParseV2 = "CombinatorialParseV2",
 }
 
diff --git a/src/powerquery-parser/task/task.ts b/src/powerquery-parser/task/task.ts
index 1c36193d..118c299a 100644
--- a/src/powerquery-parser/task/task.ts
+++ b/src/powerquery-parser/task/task.ts
@@ -14,7 +14,7 @@ export type TriedParseTask = ParseTaskOk | ParseTaskCommonError | ParseTaskParse
 
 export type TriedLexParseTask = LexTaskError | TriedParseTask;
 
-export const enum TaskStage {
+export enum TaskStage {
     Lex = "Lex",
     Parse = "Parse",
 }
diff --git a/tsconfig.json b/tsconfig.json
index 7f6749fa..38dd1d41 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -11,7 +11,6 @@
         "noUnusedLocals": true,
         "noUnusedParameters": true,
         "outDir": "lib",
-        "preserveConstEnums": true,
         "resolveJsonModule": true,
         "rootDir": "src",
         "sourceMap": true,