Ensure emitted d.ts files do not contain extraneous import expressions

These appear to break api-extractor, and we won't have a fix until TS
starts to emit d.ts files using `import type { ... }` for imports that
aren't explicitly written in the source files.

Author: jakebailey

src/compiler/factory/utilities.ts

@@ -2,11 +2,12 @@ import {
     AccessorDeclaration, addEmitFlags, AdditiveOperator, AdditiveOperatorOrHigher, AssertionLevel,
     AssignmentOperatorOrHigher, BinaryExpression, BinaryOperator, BinaryOperatorToken, BindingOrAssignmentElement,
     BindingOrAssignmentElementRestIndicator, BindingOrAssignmentElementTarget, BindingOrAssignmentPattern,
-    BitwiseOperator, BitwiseOperatorOrHigher, BooleanLiteral, CharacterCodes, CommaListExpression,
+    BitwiseOperator, BitwiseOperatorOrHigher, Block, BooleanLiteral, CharacterCodes, CommaListExpression,
     compareStringsCaseSensitive, CompilerOptions, Debug, Declaration, EmitFlags, EmitHelperFactory, EmitHost,
     EmitResolver, EntityName, EqualityOperator, EqualityOperatorOrHigher, ExclamationToken, ExponentiationOperator,
     ExportDeclaration, Expression, ExpressionStatement, externalHelpersModuleNameText, first, firstOrUndefined,
     ForInitializer, GeneratedIdentifier, GeneratedIdentifierFlags, GeneratedNamePart, GeneratedPrivateIdentifier,
+    GetAccessorDeclaration,
     getAllAccessorDeclarations, getEmitFlags, getEmitHelpers, getEmitModuleKind, getESModuleInterop,
     getExternalModuleName, getExternalModuleNameFromPath, getJSDocType, getJSDocTypeTag, getModifiers,
     getNamespaceDeclarationNode, getOrCreateEmitNode, getOriginalNode, getParseTreeNode,
@@ -26,7 +27,7 @@ import {
     NumericLiteral, ObjectLiteralElementLike, ObjectLiteralExpression, or, OuterExpression, OuterExpressionKinds,
     outFile, parseNodeFactory, PlusToken, PostfixUnaryExpression, PrefixUnaryExpression, PrivateIdentifier,
     PropertyAssignment, PropertyDeclaration, PropertyName, pushIfUnique, QuestionToken, ReadonlyKeyword,
-    RelationalOperator, RelationalOperatorOrHigher, setOriginalNode, setParent, setStartsOnNewLine, setTextRange,
+    RelationalOperator, RelationalOperatorOrHigher, SetAccessorDeclaration, setOriginalNode, setParent, setStartsOnNewLine, setTextRange,
     ShiftOperator, ShiftOperatorOrHigher, ShorthandPropertyAssignment, some, SourceFile, Statement, StringLiteral,
     SyntaxKind, TextRange, ThisTypeNode, Token, TypeNode, TypeParameterDeclaration,
 } from "../_namespaces/ts";
@@ -185,7 +186,7 @@ export function createForOfBindingStatement(factory: NodeFactory, node: ForIniti
 }
 
 /** @internal */
-export function insertLeadingStatement(factory: NodeFactory, dest: Statement, source: Statement) {
+export function insertLeadingStatement(factory: NodeFactory, dest: Statement, source: Statement): Block {
     if (isBlock(dest)) {
         return factory.updateBlock(dest, setTextRange(factory.createNodeArray([source, ...dest.statements]), dest.statements));
     }
@@ -1435,7 +1436,7 @@ export function createAccessorPropertyBackingField(factory: NodeFactory, node: P
 /**
  * Creates a {@link GetAccessorDeclaration} that reads from a private backing field.
  */
-export function createAccessorPropertyGetRedirector(factory: NodeFactory, node: PropertyDeclaration, modifiers: ModifiersArray | undefined, name: PropertyName) {
+export function createAccessorPropertyGetRedirector(factory: NodeFactory, node: PropertyDeclaration, modifiers: ModifiersArray | undefined, name: PropertyName): GetAccessorDeclaration {
     return factory.createGetAccessorDeclaration(
         modifiers,
         name,
@@ -1456,7 +1457,7 @@ export function createAccessorPropertyGetRedirector(factory: NodeFactory, node:
 /**
  * Creates a {@link SetAccessorDeclaration} that writes to a private backing field.
  */
-export function createAccessorPropertySetRedirector(factory: NodeFactory, node: PropertyDeclaration, modifiers: ModifiersArray | undefined, name: PropertyName) {
+export function createAccessorPropertySetRedirector(factory: NodeFactory, node: PropertyDeclaration, modifiers: ModifiersArray | undefined, name: PropertyName): SetAccessorDeclaration {
     return factory.createSetAccessorDeclaration(
         modifiers,
         name,

src/compiler/transformers/classFields.ts

@@ -33,7 +33,7 @@ import {
     startOnNewLine, Statement, SuperProperty, SyntaxKind, TaggedTemplateExpression, ThisExpression,
     TransformationContext, TransformFlags, tryGetTextOfPropertyName, UnderscoreEscapedMap, unescapeLeadingUnderscores,
     VariableStatement, visitArray, visitEachChild, visitFunctionBody, visitIterationBody, visitNode, visitNodes,
-    visitParameterList, VisitResult,
+    visitParameterList, VisitResult, Bundle,
 } from "../_namespaces/ts";
 
 const enum ClassPropertySubstitutionFlags {
@@ -167,7 +167,7 @@ const enum ClassFacts {
  * where declarations are elided and initializers are transformed as assignments in the constructor.
  * When --useDefineForClassFields is on, this transforms to ECMAScript semantics, with Object.defineProperty.
  */
-export function transformClassFields(context: TransformationContext) {
+export function transformClassFields(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         hoistVariableDeclaration,

src/compiler/transformers/es2015.ts

@@ -33,7 +33,7 @@ import {
     SyntaxKind, TaggedTemplateExpression, takeWhile, TemplateExpression, TextRange, TokenFlags, TransformationContext,
     TransformFlags, tryCast, unescapeLeadingUnderscores, unwrapInnermostStatementOfLabel, VariableDeclaration,
     VariableDeclarationList, VariableStatement, visitEachChild, visitNode, visitNodes, visitParameterList, VisitResult,
-    VoidExpression, WhileStatement, YieldExpression,
+    VoidExpression, WhileStatement, YieldExpression, Bundle,
 } from "../_namespaces/ts";
 
 const enum ES2015SubstitutionFlags {
@@ -299,7 +299,7 @@ function createSpreadSegment(kind: SpreadSegmentKind, expression: Expression): S
 }
 
 /** @internal */
-export function transformES2015(context: TransformationContext) {
+export function transformES2015(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         getEmitHelperFactory: emitHelpers,

src/compiler/transformers/es2016.ts

@@ -1,11 +1,11 @@
 import {
-    BinaryExpression, chainBundle, Expression, isElementAccessExpression, isExpression, isPropertyAccessExpression,
+    BinaryExpression, Bundle, chainBundle, Expression, isElementAccessExpression, isExpression, isPropertyAccessExpression,
     Node, setTextRange, SourceFile, SyntaxKind, TransformationContext, TransformFlags, visitEachChild, visitNode,
     VisitResult,
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformES2016(context: TransformationContext) {
+export function transformES2016(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         hoistVariableDeclaration

src/compiler/transformers/es2017.ts

@@ -15,6 +15,7 @@ import {
     TypeReferenceSerializationKind, unescapeLeadingUnderscores, VariableDeclaration, VariableDeclarationList,
     VariableStatement, visitEachChild, visitFunctionBody, visitIterationBody, visitNode, visitNodes, visitParameterList,
     VisitResult,
+    Bundle,
 } from "../_namespaces/ts";
 
 type SuperContainer = ClassDeclaration | MethodDeclaration | GetAccessorDeclaration | SetAccessorDeclaration | ConstructorDeclaration;
@@ -30,7 +31,7 @@ const enum ContextFlags {
 }
 
 /** @internal */
-export function transformES2017(context: TransformationContext) {
+export function transformES2017(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         getEmitHelperFactory: emitHelpers,

src/compiler/transformers/es2018.ts

@@ -17,7 +17,7 @@ import {
     SourceFile, startOnNewLine, Statement, SyntaxKind, TaggedTemplateExpression, TextRange, Token,
     TransformationContext, TransformFlags, unwrapInnermostStatementOfLabel, VariableDeclaration, VariableStatement,
     visitEachChild, visitIterationBody, visitLexicalEnvironment, visitNode, visitNodes, visitParameterList, VisitResult,
-    VoidExpression, YieldExpression,
+    VoidExpression, YieldExpression, Bundle,
 } from "../_namespaces/ts";
 
 const enum ESNextSubstitutionFlags {
@@ -58,7 +58,7 @@ const enum HierarchyFacts {
 }
 
 /** @internal */
-export function transformES2018(context: TransformationContext) {
+export function transformES2018(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         getEmitHelperFactory: emitHelpers,

src/compiler/transformers/es2019.ts

@@ -1,10 +1,11 @@
 import {
+    Bundle,
     CatchClause, chainBundle, isBlock, Node, SourceFile, SyntaxKind, TransformationContext, TransformFlags,
     visitEachChild, visitNode, VisitResult,
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformES2019(context: TransformationContext) {
+export function transformES2019(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const factory = context.factory;
     return chainBundle(context, transformSourceFile);
 

src/compiler/transformers/es2020.ts

@@ -1,5 +1,5 @@
 import {
-    AccessExpression, addEmitFlags, BinaryExpression, CallExpression, cast, chainBundle, Debug, DeleteExpression,
+    AccessExpression, addEmitFlags, BinaryExpression, Bundle, CallExpression, cast, chainBundle, Debug, DeleteExpression,
     EmitFlags, Expression, isCallChain, isExpression, isGeneratedIdentifier, isIdentifier, isNonNullChain,
     isOptionalChain, isParenthesizedExpression, isSimpleCopiableExpression, isSyntheticReference,
     isTaggedTemplateExpression, Node, OptionalChain, OuterExpressionKinds, ParenthesizedExpression, setOriginalNode,
@@ -8,7 +8,7 @@ import {
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformES2020(context: TransformationContext) {
+export function transformES2020(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         hoistVariableDeclaration,

src/compiler/transformers/es2021.ts

@@ -1,13 +1,13 @@
 import {
-    AssignmentExpression, BinaryExpression, chainBundle, getNonAssignmentOperatorForCompoundAssignment,
+    AssignmentExpression, BinaryExpression, Bundle, chainBundle, getNonAssignmentOperatorForCompoundAssignment,
     isAccessExpression, isExpression, isLeftHandSideExpression, isLogicalOrCoalescingAssignmentExpression,
     isPropertyAccessExpression, isSimpleCopiableExpression, LogicalOrCoalescingAssignmentOperator, Node,
     skipParentheses, SourceFile, SyntaxKind, Token, TransformationContext, TransformFlags, visitEachChild, visitNode,
     VisitResult,
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformES2021(context: TransformationContext) {
+export function transformES2021(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         hoistVariableDeclaration,
         factory

src/compiler/transformers/es5.ts

@@ -1,4 +1,5 @@
 import {
+    Bundle,
     chainBundle, EmitHint, Expression, getOriginalNodeId, Identifier, idText, isIdentifier, isPrivateIdentifier,
     isPropertyAccessExpression, isPropertyAssignment, JsxClosingElement, JsxEmit, JsxOpeningElement,
     JsxSelfClosingElement, Node, nodeIsSynthesized, PropertyAccessExpression, PropertyAssignment, setTextRange,
@@ -11,7 +12,7 @@ import {
  *
  * @param context Context and state information for the transformation.
  */
-export function transformES5(context: TransformationContext) {
+export function transformES5(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const { factory } = context;
     const compilerOptions = context.getCompilerOptions();
 

src/compiler/transformers/esnext.ts

@@ -1,9 +1,10 @@
 import {
+    Bundle,
     chainBundle, Node, SourceFile, TransformationContext, TransformFlags, visitEachChild, VisitResult,
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformESNext(context: TransformationContext) {
+export function transformESNext(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
   return chainBundle(context, transformSourceFile);
 
   function transformSourceFile(node: SourceFile) {

src/compiler/transformers/generators.ts

@@ -1,6 +1,6 @@
 import {
     AccessorDeclaration, addEmitHelpers, addSyntheticTrailingComment, ArrayLiteralExpression, Associativity,
-    BinaryExpression, Block, BreakStatement, CallExpression, CaseClause, chainBundle, CommaListExpression,
+    BinaryExpression, Block, BreakStatement, Bundle, CallExpression, CaseClause, chainBundle, CommaListExpression,
     ConditionalExpression, ContinueStatement, createExpressionForObjectLiteralElementLike, Debug, DoStatement,
     ElementAccessExpression, EmitFlags, EmitHint, ESMap, Expression, ExpressionStatement, forEach, ForInStatement,
     ForStatement, FunctionDeclaration, FunctionExpression, getEmitFlags, getEmitScriptTarget,
@@ -247,7 +247,7 @@ function getInstructionName(instruction: Instruction): string {
 }
 
 /** @internal */
-export function transformGenerators(context: TransformationContext) {
+export function transformGenerators(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         getEmitHelperFactory: emitHelpers,

src/compiler/transformers/jsx.ts

@@ -1,5 +1,5 @@
 import {
-    addEmitHelpers, arrayFrom, chainBundle, createExpressionForJsxElement, createExpressionForJsxFragment,
+    addEmitHelpers, arrayFrom, Bundle, chainBundle, createExpressionForJsxElement, createExpressionForJsxFragment,
     createExpressionFromEntityName, createJsxFactoryExpression, Debug, emptyArray, Expression, filter, find, flatten,
     GeneratedIdentifierFlags, getEmitScriptTarget, getEntries, getJSXImplicitImportBase, getJSXRuntimeImport,
     getLineAndCharacterOfPosition, getOriginalNode, getSemanticJsxChildren, Identifier, idText, ImportSpecifier,
@@ -14,7 +14,7 @@ import {
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformJsx(context: TransformationContext) {
+export function transformJsx(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     interface PerFileState {
         importSpecifier?: string;
         filenameDeclaration?: VariableDeclaration & { name: Identifier; };

src/compiler/transformers/legacyDecorators.ts

@@ -1,5 +1,5 @@
 import {
-    addEmitHelpers, addRange, AllDecorators, append, canHaveDecorators, chainBundle, childIsDecorated, ClassDeclaration,
+    addEmitHelpers, addRange, AllDecorators, append, Bundle, canHaveDecorators, chainBundle, childIsDecorated, ClassDeclaration,
     ClassElement, ClassExpression, ClassLikeDeclaration, classOrConstructorParameterIsDecorated, ConstructorDeclaration,
     Decorator, elideNodes, EmitFlags, EmitHint, EnumMember, Expression, filter, flatMap, GetAccessorDeclaration,
     getAllDecoratorsOfClass, getAllDecoratorsOfClassElement, getEmitFlags, getEmitScriptTarget, getOriginalNodeId,
@@ -14,7 +14,7 @@ import {
 } from "../_namespaces/ts";
 
 /** @internal */
-export function transformLegacyDecorators(context: TransformationContext) {
+export function transformLegacyDecorators(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         getEmitHelperFactory: emitHelpers,

src/compiler/transformers/module/esnextAnd2015.ts

@@ -1,5 +1,5 @@
 import {
-    addRange, append, chainBundle, createEmptyExports, createExternalHelpersImportDeclarationIfNeeded, Debug, EmitFlags,
+    addRange, append, Bundle, chainBundle, createEmptyExports, createExternalHelpersImportDeclarationIfNeeded, Debug, EmitFlags,
     EmitHint, ESMap, ExportAssignment, ExportDeclaration, Expression, GeneratedIdentifierFlags, getEmitFlags,
     getEmitModuleKind, getEmitScriptTarget, getExternalModuleNameLiteral, hasSyntacticModifier, Identifier, idText,
     ImportDeclaration, ImportEqualsDeclaration, insertStatementsAfterCustomPrologue,
@@ -10,7 +10,7 @@ import {
 } from "../../_namespaces/ts";
 
 /** @internal */
-export function transformECMAScriptModule(context: TransformationContext) {
+export function transformECMAScriptModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     const {
         factory,
         getEmitHelperFactory: emitHelpers,

src/compiler/transformers/module/module.ts

@@ -1,5 +1,6 @@
 import {
     addEmitFlags, addEmitHelper, addEmitHelpers, addRange, append, ArrowFunction, BinaryExpression, BindingElement,
+    Bundle,
     CallExpression, chainBundle, ClassDeclaration, collectExternalModuleInfo, Debug, Declaration,
     DestructuringAssignment, EmitFlags, EmitHelper, EmitHint, emptyArray, EndOfDeclarationMarker, ExportAssignment,
     ExportDeclaration, Expression, ExpressionStatement, ExternalModuleInfo, firstOrUndefined,
@@ -27,7 +28,7 @@ import {
 } from "../../_namespaces/ts";
 
 /** @internal */
-export function transformModule(context: TransformationContext) {
+export function transformModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     interface AsynchronousDependencies {
         aliasedModuleNames: Expression[];
         unaliasedModuleNames: Expression[];

src/compiler/transformers/module/system.ts

@@ -1,5 +1,5 @@
 import {
-    addRange, append, BinaryExpression, BindingElement, Block, CaseBlock, CaseClause, CaseOrDefaultClause, CatchClause,
+    addRange, append, BinaryExpression, BindingElement, Block, Bundle, CaseBlock, CaseClause, CaseOrDefaultClause, CatchClause,
     chainBundle, ClassDeclaration, collectExternalModuleInfo, Debug, Declaration, DefaultClause,
     DestructuringAssignment, DoStatement, EmitFlags, EmitHint, EndOfDeclarationMarker, ExportAssignment,
     ExportDeclaration, Expression, ExpressionStatement, ExternalModuleInfo, firstOrUndefined,
@@ -25,7 +25,7 @@ import {
 } from "../../_namespaces/ts";
 
 /** @internal */
-export function transformSystemModule(context: TransformationContext) {
+export function transformSystemModule(context: TransformationContext): (x: SourceFile | Bundle) => SourceFile | Bundle {
     interface DependencyGroup {
         name: StringLiteral;
         externalImports: (ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration)[];

src/compiler/transformers/taggedTemplate.ts

@@ -1,4 +1,5 @@
 import {
+    CallExpression,
     Debug, Expression, factory, getSourceTextOfNodeFromSourceFile, hasInvalidEscape, Identifier, isExpression,
     isExternalModule, isNoSubstitutionTemplateLiteral, NoSubstitutionTemplateLiteral, setTextRange, SourceFile,
     SyntaxKind, TaggedTemplateExpression, TemplateHead, TemplateLiteralLikeNode, TemplateMiddle, TemplateTail,
@@ -18,7 +19,7 @@ export function processTaggedTemplateExpression(
     visitor: Visitor,
     currentSourceFile: SourceFile,
     recordTaggedTemplateString: (temp: Identifier) => void,
-    level: ProcessLevel) {
+    level: ProcessLevel): TaggedTemplateExpression | CallExpression {
 
     // Visit the tag expression
     const tag = visitNode(node.tag, visitor, isExpression);

src/compiler/transformers/utilities.ts

@@ -12,7 +12,7 @@ import {
     isPrivateIdentifier, isPropertyDeclaration, isStatic, isStringLiteralLike, isSuperCall, LogicalOperatorOrHigher,
     map, Map, MethodDeclaration, ModifierFlags, NamedImportBindings, NamespaceExport, Node, NodeArray,
     parameterIsThisKeyword, PrivateIdentifierAccessorDeclaration, PrivateIdentifierAutoAccessorPropertyDeclaration,
-    PrivateIdentifierMethodDeclaration, PropertyDeclaration, skipParentheses, some, SourceFile, Statement, SyntaxKind,
+    PrivateIdentifierMethodDeclaration, PropertyDeclaration, skipParentheses, some, SourceFile, Statement, SuperCall, SyntaxKind,
     TransformationContext, VariableDeclaration, VariableStatement,
 } from "../_namespaces/ts";
 
@@ -329,7 +329,7 @@ export function getNonAssignmentOperatorForCompoundAssignment(kind: CompoundAssi
 /**
  * @returns Contained super() call from descending into the statement ignoring parentheses, if that call exists.
  */
-export function getSuperCallFromStatement(statement: Statement) {
+export function getSuperCallFromStatement(statement: Statement): SuperCall | undefined {
     if (!isExpressionStatement(statement)) {
         return undefined;
     }