Update AST to unify type with other modifiers

Author: nicolo-ribaudo

src/compiler/checker.ts

@@ -432,7 +432,6 @@ import {
     ImportDeclaration,
     ImportEqualsDeclaration,
     ImportOrExportSpecifier,
-    ImportPhase,
     ImportSpecifier,
     ImportTypeNode,
     IndexedAccessType,
@@ -9852,14 +9851,13 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                                 factory.createImportDeclaration(
                                     /*modifiers*/ undefined,
                                     factory.createImportClause(
-                                        /*isTypeOnly*/ false,
+                                        /*phaseModifier*/ undefined,
                                         /*name*/ undefined,
                                         factory.createNamedImports([factory.createImportSpecifier(
                                             /*isTypeOnly*/ false,
                                             propertyName && isIdentifier(propertyName) ? factory.createIdentifier(idText(propertyName)) : undefined,
                                             factory.createIdentifier(localName),
                                         )]),
-                                        ImportPhase.Evaluation,
                                     ),
                                     factory.createStringLiteral(specifier),
                                     /*attributes*/ undefined,
@@ -9946,7 +9944,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                         addResult(
                             factory.createImportDeclaration(
                                 /*modifiers*/ undefined,
-                                factory.createImportClause(isTypeOnly, factory.createIdentifier(localName), /*namedBindings*/ undefined, ImportPhase.Evaluation),
+                                factory.createImportClause(
+                                    /* phaseModifier */ isTypeOnly ? SyntaxKind.TypeKeyword : undefined,
+                                    factory.createIdentifier(localName),
+                                    /*namedBindings*/ undefined,
+                                ),
                                 specifier,
                                 attributes,
                             ),
@@ -9961,7 +9963,11 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                         addResult(
                             factory.createImportDeclaration(
                                 /*modifiers*/ undefined,
-                                factory.createImportClause(isTypeOnly, /*name*/ undefined, factory.createNamespaceImport(factory.createIdentifier(localName)), ImportPhase.Evaluation),
+                                factory.createImportClause(
+                                    /* phaseModifier */ isTypeOnly ? SyntaxKind.TypeKeyword : undefined,
+                                    /*name*/ undefined,
+                                    factory.createNamespaceImport(factory.createIdentifier(localName)),
+                                ),
                                 specifier,
                                 (node as ImportClause).parent.attributes,
                             ),
@@ -9988,7 +9994,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                             factory.createImportDeclaration(
                                 /*modifiers*/ undefined,
                                 factory.createImportClause(
-                                    isTypeOnly,
+                                    /* phaseModifier */ isTypeOnly ? SyntaxKind.TypeKeyword : undefined,
                                     /*name*/ undefined,
                                     factory.createNamedImports([
                                         factory.createImportSpecifier(
@@ -9997,7 +10003,6 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                                             factory.createIdentifier(localName),
                                         ),
                                     ]),
-                                    ImportPhase.Evaluation,
                                 ),
                                 specifier,
                                 (node as ImportSpecifier).parent.parent.parent.attributes,
@@ -52863,7 +52868,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         if (node.isTypeOnly && node.namedBindings?.kind === SyntaxKind.NamedImports) {
             return checkGrammarNamedImportsOrExports(node.namedBindings);
         }
-        if (node.phase !== ImportPhase.Evaluation && moduleKind !== ModuleKind.ESNext) {
+        if (node.phaseModifier === SyntaxKind.DeferKeyword && moduleKind !== ModuleKind.ESNext) {
             return grammarErrorOnNode(node, Diagnostics.Deferred_imports_are_only_supported_when_the_module_flag_is_set_to_esnext);
         }
         return false;

src/compiler/emitter.ts

@@ -182,7 +182,6 @@ import {
     ImportDeclaration,
     ImportEqualsDeclaration,
     ImportOrExportSpecifier,
-    ImportPhase,
     ImportSpecifier,
     ImportTypeNode,
     IndexedAccessTypeNode,
@@ -3686,12 +3685,12 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
     }
 
     function emitImportClause(node: ImportClause) {
-        if (node.isTypeOnly) {
-            emitTokenWithComment(SyntaxKind.TypeKeyword, node.pos, writeKeyword, node);
+        if (node.phaseModifier !== undefined) {
+            emitTokenWithComment(node.phaseModifier, node.pos, writeKeyword, node);
             writeSpace();
         }
-        else if (node.phase !== ImportPhase.Evaluation) {
-            emitTokenWithComment(SyntaxKind.DeferKeyword, node.pos, writeKeyword, node);
+        else if (node.isTypeOnly) {
+            emitTokenWithComment(SyntaxKind.TypeKeyword, node.pos, writeKeyword, node);
             writeSpace();
         }
         emit(node.name);

src/compiler/factory/nodeFactory.ts

@@ -135,7 +135,7 @@ import {
     ImportClause,
     ImportDeclaration,
     ImportEqualsDeclaration,
-    ImportPhase,
+    ImportPhaseModifier,
     ImportSpecifier,
     ImportTypeAssertionContainer,
     ImportTypeNode,
@@ -4724,28 +4724,33 @@ export function createNodeFactory(flags: NodeFactoryFlags, baseFactory: BaseNode
     }
 
     // @api
-    function createImportClause(isTypeOnly: boolean, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined, phase: ImportPhase): ImportClause {
+    function createImportClause(phaseModifier: ImportPhaseModifier | boolean | undefined, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined): ImportClause {
         const node = createBaseDeclaration<ImportClause>(SyntaxKind.ImportClause);
-        node.isTypeOnly = isTypeOnly;
+        if (typeof phaseModifier === "boolean") {
+            phaseModifier = phaseModifier ? SyntaxKind.TypeKeyword : undefined;
+        }
+        node.isTypeOnly = phaseModifier === SyntaxKind.TypeKeyword;
+        node.phaseModifier = phaseModifier;
         node.name = name;
         node.namedBindings = namedBindings;
-        node.phase = phase;
         node.transformFlags |= propagateChildFlags(node.name) |
             propagateChildFlags(node.namedBindings);
-        if (isTypeOnly) {
+        if (phaseModifier === SyntaxKind.TypeKeyword) {
             node.transformFlags |= TransformFlags.ContainsTypeScript;
         }
         node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // always parsed in an Await context
         return node;
     }
 
     // @api
-    function updateImportClause(node: ImportClause, isTypeOnly: boolean, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined, phase: ImportPhase) {
-        return node.isTypeOnly !== isTypeOnly
+    function updateImportClause(node: ImportClause, phaseModifier: ImportPhaseModifier | boolean | undefined, name: Identifier | undefined, namedBindings: NamedImportBindings | undefined) {
+        if (typeof phaseModifier === "boolean") {
+            phaseModifier = phaseModifier ? SyntaxKind.TypeKeyword : undefined;
+        }
+        return node.phaseModifier !== phaseModifier
                 || node.name !== name
                 || node.namedBindings !== namedBindings
-                || node.phase !== phase
-            ? update(createImportClause(isTypeOnly, name, namedBindings, phase), node)
+            ? update(createImportClause(phaseModifier, name, namedBindings), node)
             : node;
     }
 

src/compiler/factory/utilities.ts

@@ -75,7 +75,6 @@ import {
     ImportCall,
     ImportDeclaration,
     ImportEqualsDeclaration,
-    ImportPhase,
     InternalEmitFlags,
     isAssignmentExpression,
     isAssignmentOperator,
@@ -731,7 +730,7 @@ export function createExternalHelpersImportDeclarationIfNeeded(nodeFactory: Node
 
                     const externalHelpersImportDeclaration = nodeFactory.createImportDeclaration(
                         /*modifiers*/ undefined,
-                        nodeFactory.createImportClause(/*isTypeOnly*/ false, /*name*/ undefined, namedBindings, ImportPhase.Evaluation),
+                        nodeFactory.createImportClause(/*phaseModifier*/ undefined, /*name*/ undefined, namedBindings),
                         nodeFactory.createStringLiteral(externalHelpersModuleNameText),
                         /*attributes*/ undefined,
                     );

src/compiler/parser.ts

@@ -123,7 +123,7 @@ import {
     ImportDeclaration,
     ImportEqualsDeclaration,
     ImportOrExportSpecifier,
-    ImportPhase,
+    ImportPhaseModifier,
     ImportSpecifier,
     ImportTypeAssertionContainer,
     ImportTypeNode,
@@ -8368,30 +8368,29 @@ namespace Parser {
             identifier = parseIdentifier();
         }
 
-        let isTypeOnly = false;
-        let phase = ImportPhase.Evaluation;
+        let phaseModifier: ImportPhaseModifier | undefined;
         if (
             identifier?.escapedText === "type" &&
             (token() !== SyntaxKind.FromKeyword || isIdentifier() && lookAhead(nextTokenIsFromKeywordOrEqualsToken)) &&
             (isIdentifier() || tokenAfterImportDefinitelyProducesImportDeclaration())
         ) {
-            isTypeOnly = true;
+            phaseModifier = SyntaxKind.TypeKeyword;
             identifier = isIdentifier() ? parseIdentifier() : undefined;
         }
         else if (identifier?.escapedText === "defer" && token() !== SyntaxKind.FromKeyword) {
-            phase = ImportPhase.Defer;
+            phaseModifier = SyntaxKind.DeferKeyword;
             identifier = undefined;
             if (isIdentifier()) {
                 parseErrorAtCurrentToken(Diagnostics.Default_imports_aren_t_allowed_for_deferred_imports);
                 identifier = parseIdentifier();
             }
         }
 
-        if (identifier && !tokenAfterImportedIdentifierDefinitelyProducesImportDeclaration() && phase !== ImportPhase.Defer) {
-            return parseImportEqualsDeclaration(pos, hasJSDoc, modifiers, identifier, isTypeOnly);
+        if (identifier && !tokenAfterImportedIdentifierDefinitelyProducesImportDeclaration() && phaseModifier !== SyntaxKind.DeferKeyword) {
+            return parseImportEqualsDeclaration(pos, hasJSDoc, modifiers, identifier, phaseModifier === SyntaxKind.TypeKeyword);
         }
 
-        const importClause = tryParseImportClause(identifier, afterImportPos, isTypeOnly, /*skipJsDocLeadingAsterisks*/ undefined, phase);
+        const importClause = tryParseImportClause(identifier, afterImportPos, phaseModifier, /*skipJsDocLeadingAsterisks*/ undefined);
         const moduleSpecifier = parseModuleSpecifier();
         const attributes = tryParseImportAttributes();
 
@@ -8400,7 +8399,7 @@ namespace Parser {
         return withJSDoc(finishNode(node, pos), hasJSDoc);
     }
 
-    function tryParseImportClause(identifier: Identifier | undefined, pos: number, isTypeOnly: boolean, skipJsDocLeadingAsterisks = false, phase: ImportPhase) {
+    function tryParseImportClause(identifier: Identifier | undefined, pos: number, phaseModifier: undefined | ImportPhaseModifier, skipJsDocLeadingAsterisks = false) {
         // ImportDeclaration:
         //  import ImportClause from ModuleSpecifier ;
         //  import ModuleSpecifier;
@@ -8410,7 +8409,7 @@ namespace Parser {
             token() === SyntaxKind.AsteriskToken || // import *
             token() === SyntaxKind.OpenBraceToken // import {
         ) {
-            importClause = parseImportClause(identifier, pos, isTypeOnly, skipJsDocLeadingAsterisks, phase);
+            importClause = parseImportClause(identifier, pos, phaseModifier, skipJsDocLeadingAsterisks);
             parseExpected(SyntaxKind.FromKeyword);
         }
         return importClause;
@@ -8476,7 +8475,7 @@ namespace Parser {
         return finished;
     }
 
-    function parseImportClause(identifier: Identifier | undefined, pos: number, isTypeOnly: boolean, skipJsDocLeadingAsterisks: boolean, phase: ImportPhase) {
+    function parseImportClause(identifier: Identifier | undefined, pos: number, phaseModifier: undefined | ImportPhaseModifier, skipJsDocLeadingAsterisks: boolean) {
         // ImportClause:
         //  ImportedDefaultBinding
         //  NameSpaceImport
@@ -8496,15 +8495,15 @@ namespace Parser {
                 namedBindings = parseNamespaceImport();
             }
             else {
-                if (phase === ImportPhase.Defer) {
+                if (phaseModifier === SyntaxKind.DeferKeyword) {
                     parseErrorAtCurrentToken(Diagnostics.Named_imports_aren_t_allowed_for_deferred_imports);
                 }
                 namedBindings = parseNamedImportsOrExports(SyntaxKind.NamedImports);
             }
             if (skipJsDocLeadingAsterisks) scanner.setSkipJsDocLeadingAsterisks(false);
         }
 
-        return finishNode(factory.createImportClause(isTypeOnly, identifier, namedBindings, phase), pos);
+        return finishNode(factory.createImportClause(phaseModifier, identifier, namedBindings), pos);
     }
 
     function parseModuleReference() {
@@ -9538,7 +9537,7 @@ namespace Parser {
                     identifier = parseIdentifier();
                 }
 
-                const importClause = tryParseImportClause(identifier, afterImportTagPos, /*isTypeOnly*/ true, /*skipJsDocLeadingAsterisks*/ true, ImportPhase.Evaluation);
+                const importClause = tryParseImportClause(identifier, afterImportTagPos, SyntaxKind.TypeKeyword, /*skipJsDocLeadingAsterisks*/ true);
                 const moduleSpecifier = parseModuleSpecifier();
                 const attributes = tryParseImportAttributes();
 

src/compiler/transformers/declarations.ts

@@ -886,10 +886,9 @@ export function transformDeclarations(context: TransformationContext): Transform
                 decl.modifiers,
                 factory.updateImportClause(
                     decl.importClause,
-                    decl.importClause.isTypeOnly,
+                    decl.importClause.phaseModifier,
                     visibleDefaultBinding,
                     /*namedBindings*/ undefined,
-                    decl.importClause.phase,
                 ),
                 rewriteModuleSpecifier(decl, decl.moduleSpecifier),
                 tryGetResolutionModeOverride(decl.attributes),
@@ -903,10 +902,9 @@ export function transformDeclarations(context: TransformationContext): Transform
                 decl.modifiers,
                 factory.updateImportClause(
                     decl.importClause,
-                    decl.importClause.isTypeOnly,
+                    decl.importClause.phaseModifier,
                     visibleDefaultBinding,
                     namedBindings,
-                    decl.importClause.phase,
                 ),
                 rewriteModuleSpecifier(decl, decl.moduleSpecifier),
                 tryGetResolutionModeOverride(decl.attributes),
@@ -920,10 +918,9 @@ export function transformDeclarations(context: TransformationContext): Transform
                 decl.modifiers,
                 factory.updateImportClause(
                     decl.importClause,
-                    decl.importClause.isTypeOnly,
+                    decl.importClause.phaseModifier,
                     visibleDefaultBinding,
                     bindingList && bindingList.length ? factory.updateNamedImports(decl.importClause.namedBindings, bindingList) : undefined,
-                    decl.importClause.phase,
                 ),
                 rewriteModuleSpecifier(decl, decl.moduleSpecifier),
                 tryGetResolutionModeOverride(decl.attributes),

src/compiler/transformers/jsx.ts

@@ -22,7 +22,6 @@ import {
     getSemanticJsxChildren,
     Identifier,
     idText,
-    ImportPhase,
     ImportSpecifier,
     insertStatementAfterCustomPrologue,
     isExpression,
@@ -173,7 +172,7 @@ export function transformJsx(context: TransformationContext): (x: SourceFile | B
             for (const [importSource, importSpecifiersMap] of arrayFrom(currentFileState.utilizedImplicitRuntimeImports.entries())) {
                 if (isExternalModule(node)) {
                     // Add `import` statement
-                    const importStatement = factory.createImportDeclaration(/*modifiers*/ undefined, factory.createImportClause(/*isTypeOnly*/ false, /*name*/ undefined, factory.createNamedImports(arrayFrom(importSpecifiersMap.values())), ImportPhase.Evaluation), factory.createStringLiteral(importSource), /*attributes*/ undefined);
+                    const importStatement = factory.createImportDeclaration(/*modifiers*/ undefined, factory.createImportClause(/*phaseModifier*/ undefined, /*name*/ undefined, factory.createNamedImports(arrayFrom(importSpecifiersMap.values()))), factory.createStringLiteral(importSource), /*attributes*/ undefined);
                     setParentRecursive(importStatement, /*incremental*/ false);
                     statements = insertStatementAfterCustomPrologue(statements.slice(), importStatement);
                 }

src/compiler/transformers/module/esnextAnd2015.ts

@@ -28,7 +28,6 @@ import {
     idText,
     ImportDeclaration,
     ImportEqualsDeclaration,
-    ImportPhase,
     insertStatementsAfterCustomPrologue,
     isExportNamespaceAsDefaultDeclaration,
     isExternalModule,
@@ -220,12 +219,11 @@ export function transformECMAScriptModule(context: TransformationContext): (x: S
             const importStatement = factory.createImportDeclaration(
                 /*modifiers*/ undefined,
                 factory.createImportClause(
-                    /*isTypeOnly*/ false,
+                    /*phaseModifier*/ undefined,
                     /*name*/ undefined,
                     factory.createNamedImports([
                         factory.createImportSpecifier(/*isTypeOnly*/ false, factory.createIdentifier("createRequire"), createRequireName),
                     ]),
-                    ImportPhase.Evaluation,
                 ),
                 factory.createStringLiteral("module"),
                 /*attributes*/ undefined,
@@ -353,12 +351,11 @@ export function transformECMAScriptModule(context: TransformationContext): (x: S
         const importDecl = factory.createImportDeclaration(
             /*modifiers*/ undefined,
             factory.createImportClause(
-                /*isTypeOnly*/ false,
+                /*phaseModifier*/ undefined,
                 /*name*/ undefined,
                 factory.createNamespaceImport(
                     synthName,
                 ),
-                ImportPhase.Evaluation,
             ),
             updatedModuleSpecifier!,
             node.attributes,