Replace SparseArray<T> with T[]

Author: Andy Hanson

src/compiler/checker.ts

@@ -4084,7 +4084,7 @@ namespace ts {
                 enumType.symbol = symbol;
                 if (enumHasLiteralMembers(symbol)) {
                     const memberTypeList: Type[] = [];
-                    const memberTypes: SparseArray<EnumLiteralType> = [];
+                    const memberTypes: EnumLiteralType[] = [];
                     for (const declaration of enumType.symbol.declarations) {
                         if (declaration.kind === SyntaxKind.EnumDeclaration) {
                             computeEnumMemberValues(<EnumDeclaration>declaration);

src/compiler/factory.ts

@@ -2646,7 +2646,7 @@ namespace ts {
         return destEmitNode;
     }
 
-    function mergeTokenSourceMapRanges(sourceRanges: SparseArray<TextRange>, destRanges: SparseArray<TextRange>) {
+    function mergeTokenSourceMapRanges(sourceRanges: TextRange[], destRanges: TextRange[]) {
         if (!destRanges) destRanges = [];
         for (const key in sourceRanges) {
             destRanges[key] = sourceRanges[key];
@@ -3277,7 +3277,7 @@ namespace ts {
         externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[]; // imports of other external modules
         externalHelpersImportDeclaration: ImportDeclaration | undefined; // import of external helpers
         exportSpecifiers: Map<ExportSpecifier[]>; // export specifiers by name
-        exportedBindings: SparseArray<Identifier[]>; // exported names of local declarations
+        exportedBindings: Identifier[][]; // exported names of local declarations
         exportedNames: Identifier[]; // all exported names local to module
         exportEquals: ExportAssignment | undefined; // an export= declaration if one was present
         hasExportStarsToExportValues: boolean; // whether this module contains export*
@@ -3286,7 +3286,7 @@ namespace ts {
     export function collectExternalModuleInfo(sourceFile: SourceFile, resolver: EmitResolver, compilerOptions: CompilerOptions): ExternalModuleInfo {
         const externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[] = [];
         const exportSpecifiers = createMultiMap<ExportSpecifier>();
-        const exportedBindings: SparseArray<Identifier[]> = [];
+        const exportedBindings: Identifier[][] = [];
         const uniqueExports = createMap<boolean>();
         let exportedNames: Identifier[];
         let hasExportDefault = false;
@@ -3435,7 +3435,7 @@ namespace ts {
     }
 
     /** Use a sparse array as a multi-map. */
-    function multiMapSparseArrayAdd<V>(map: SparseArray<V[]>, key: number, value: V): V[] {
+    function multiMapSparseArrayAdd<V>(map: V[][], key: number, value: V): V[] {
         let values = map[key];
         if (values) {
             values.push(value);

src/compiler/transformers/generators.ts

@@ -243,7 +243,7 @@ namespace ts {
 
         let currentSourceFile: SourceFile;
         let renamedCatchVariables: Map<boolean>;
-        let renamedCatchVariableDeclarations: SparseArray<Identifier>;
+        let renamedCatchVariableDeclarations: Identifier[];
 
         let inGeneratorFunctionBody: boolean;
         let inStatementContainingYield: boolean;

src/compiler/transformers/module/module.ts

@@ -39,12 +39,12 @@ namespace ts {
         context.enableSubstitution(SyntaxKind.ShorthandPropertyAssignment); // Substitutes shorthand property assignments for imported/exported symbols.
         context.enableEmitNotification(SyntaxKind.SourceFile); // Restore state when substituting nodes in a file.
 
-        const moduleInfoMap: SparseArray<ExternalModuleInfo> = []; // The ExternalModuleInfo for each file.
-        const deferredExports: SparseArray<Statement[]> = []; // Exports to defer until an EndOfDeclarationMarker is found.
+        const moduleInfoMap: ExternalModuleInfo[] = []; // The ExternalModuleInfo for each file.
+        const deferredExports: Statement[][] = []; // Exports to defer until an EndOfDeclarationMarker is found.
 
         let currentSourceFile: SourceFile; // The current file.
         let currentModuleInfo: ExternalModuleInfo; // The ExternalModuleInfo for the current file.
-        let noSubstitution: SparseArray<boolean>; // Set of nodes for which substitution rules should be ignored.
+        let noSubstitution: boolean[]; // Set of nodes for which substitution rules should be ignored.
 
         return transformSourceFile;
 

src/compiler/transformers/module/system.ts

@@ -28,18 +28,18 @@ namespace ts {
         context.enableSubstitution(SyntaxKind.PostfixUnaryExpression); // Substitutes updates to exported symbols.
         context.enableEmitNotification(SyntaxKind.SourceFile); // Restore state when substituting nodes in a file.
 
-        const moduleInfoMap: SparseArray<ExternalModuleInfo> = []; // The ExternalModuleInfo for each file.
-        const deferredExports: SparseArray<Statement[]> = []; // Exports to defer until an EndOfDeclarationMarker is found.
-        const exportFunctionsMap: SparseArray<Identifier> = []; // The export function associated with a source file.
-        const noSubstitutionMap: SparseArray<SparseArray<boolean>> = []; // Set of nodes for which substitution rules should be ignored for each file.
+        const moduleInfoMap: ExternalModuleInfo[] = []; // The ExternalModuleInfo for each file.
+        const deferredExports: Statement[][] = []; // Exports to defer until an EndOfDeclarationMarker is found.
+        const exportFunctionsMap: Identifier[] = []; // The export function associated with a source file.
+        const noSubstitutionMap: boolean[][] = []; // Set of nodes for which substitution rules should be ignored for each file.
 
         let currentSourceFile: SourceFile; // The current file.
         let moduleInfo: ExternalModuleInfo; // ExternalModuleInfo for the current file.
         let exportFunction: Identifier; // The export function for the current file.
         let contextObject: Identifier; // The context object for the current file.
         let hoistedStatements: Statement[];
         let enclosingBlockScopedContainer: Node;
-        let noSubstitution: SparseArray<boolean>; // Set of nodes for which substitution rules should be ignored.
+        let noSubstitution: boolean[]; // Set of nodes for which substitution rules should be ignored.
 
         return transformSourceFile;
 

src/compiler/transformers/ts.ts

@@ -60,7 +60,7 @@ namespace ts {
          * A map that keeps track of aliases created for classes with decorators to avoid issues
          * with the double-binding behavior of classes.
          */
-        let classAliases: SparseArray<Identifier>;
+        let classAliases: Identifier[];
 
         /**
          * Keeps track of whether  we are within any containing namespaces when performing

src/compiler/types.ts

@@ -8,13 +8,6 @@
         [index: string]: T;
     }
 
-    /**
-     * Like MapLike, but keys must be numbers.
-     */
-    export interface SparseArray<T> {
-        [key: number]: T;
-    }
-
     /** ES6 Map interface. */
     export interface Map<T> {
         get(key: string): T;
@@ -2854,7 +2847,7 @@
 
     // Enum types (TypeFlags.Enum)
     export interface EnumType extends Type {
-        memberTypes: SparseArray<EnumLiteralType>;
+        memberTypes: EnumLiteralType[];
     }
 
     // Enum types (TypeFlags.EnumLiteral)
@@ -3684,7 +3677,7 @@
         flags?: EmitFlags;                      // Flags that customize emit
         commentRange?: TextRange;               // The text range to use when emitting leading or trailing comments
         sourceMapRange?: TextRange;             // The text range to use when emitting leading or trailing source mappings
-        tokenSourceMapRanges?: SparseArray<TextRange>;  // The text range to use when emitting source mappings for tokens
+        tokenSourceMapRanges?: TextRange[];  // The text range to use when emitting source mappings for tokens
         constantValue?: number;                 // The constant value of an expression
         externalHelpersModuleName?: Identifier; // The local name for an imported helpers module
         helpers?: EmitHelper[];                 // Emit helpers for the node

src/compiler/utilities.ts

@@ -3362,7 +3362,7 @@ namespace ts {
         return false;
     }
 
-    const syntaxKindCache: SparseArray<string> = [];
+    const syntaxKindCache: string[] = [];
 
     export function formatSyntaxKind(kind: SyntaxKind): string {
         const syntaxKindEnum = (<any>ts).SyntaxKind;

src/harness/unittests/session.ts

@@ -416,7 +416,7 @@ namespace ts.server {
         class InProcClient {
             private server: InProcSession;
             private seq = 0;
-            private callbacks: SparseArray<(resp: protocol.Response) => void> = [];
+            private callbacks: Array<(resp: protocol.Response) => void> = [];
             private eventHandlers = createMap<(args: any) => void>();
 
             handle(msg: protocol.Message): void {

src/harness/unittests/tsserverProjectSystem.ts

@@ -292,7 +292,7 @@ namespace ts.projectSystem {
     }
 
     export class Callbacks {
-        private map: SparseArray<TimeOutCallback> = [];
+        private map: TimeOutCallback[] = [];
         private nextId = 1;
 
         register(cb: (...args: any[]) => void, args: any[]) {