/
moveToNewFile.ts
847 lines (769 loc) · 45.1 KB
/
moveToNewFile.ts
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/* @internal */
namespace ts.refactor {
const refactorName = "Move to a new file";
const description = getLocaleSpecificMessage(Diagnostics.Move_to_a_new_file);
const moveToNewFileAction = {
name: refactorName,
description,
kind: "refactor.move.newFile",
};
registerRefactor(refactorName, {
kinds: [moveToNewFileAction.kind],
getAvailableActions: function getRefactorActionsToMoveToNewFile(context): readonly ApplicableRefactorInfo[] {
const statements = getStatementsToMove(context);
if (context.preferences.allowTextChangesInNewFiles && statements) {
return [{ name: refactorName, description, actions: [moveToNewFileAction] }];
}
if (context.preferences.provideRefactorNotApplicableReason) {
return [{ name: refactorName, description, actions:
[{ ...moveToNewFileAction, notApplicableReason: getLocaleSpecificMessage(Diagnostics.Selection_is_not_a_valid_statement_or_statements) }]
}];
}
return emptyArray;
},
getEditsForAction: function getRefactorEditsToMoveToNewFile(context, actionName): RefactorEditInfo {
Debug.assert(actionName === refactorName, "Wrong refactor invoked");
const statements = Debug.checkDefined(getStatementsToMove(context));
const edits = textChanges.ChangeTracker.with(context, t => doChange(context.file, context.program, statements, t, context.host, context.preferences));
return { edits, renameFilename: undefined, renameLocation: undefined };
}
});
interface RangeToMove { readonly toMove: readonly Statement[]; readonly afterLast: Statement | undefined; }
function getRangeToMove(context: RefactorContext): RangeToMove | undefined {
const { file } = context;
const range = createTextRangeFromSpan(getRefactorContextSpan(context));
const { statements } = file;
const startNodeIndex = findIndex(statements, s => s.end > range.pos);
if (startNodeIndex === -1) return undefined;
const startStatement = statements[startNodeIndex];
if (isNamedDeclaration(startStatement) && startStatement.name && rangeContainsRange(startStatement.name, range)) {
return { toMove: [statements[startNodeIndex]], afterLast: statements[startNodeIndex + 1] };
}
// Can't only partially include the start node or be partially into the next node
if (range.pos > startStatement.getStart(file)) return undefined;
const afterEndNodeIndex = findIndex(statements, s => s.end > range.end, startNodeIndex);
// Can't be partially into the next node
if (afterEndNodeIndex !== -1 && (afterEndNodeIndex === 0 || statements[afterEndNodeIndex].getStart(file) < range.end)) return undefined;
return {
toMove: statements.slice(startNodeIndex, afterEndNodeIndex === -1 ? statements.length : afterEndNodeIndex),
afterLast: afterEndNodeIndex === -1 ? undefined : statements[afterEndNodeIndex],
};
}
function doChange(oldFile: SourceFile, program: Program, toMove: ToMove, changes: textChanges.ChangeTracker, host: LanguageServiceHost, preferences: UserPreferences): void {
const checker = program.getTypeChecker();
const usage = getUsageInfo(oldFile, toMove.all, checker);
const currentDirectory = getDirectoryPath(oldFile.fileName);
const extension = extensionFromPath(oldFile.fileName);
const newModuleName = makeUniqueModuleName(getNewModuleName(usage.oldFileImportsFromNewFile, usage.movedSymbols), extension, currentDirectory, host);
const newFileNameWithExtension = newModuleName + extension;
// If previous file was global, this is easy.
changes.createNewFile(oldFile, combinePaths(currentDirectory, newFileNameWithExtension), getNewStatementsAndRemoveFromOldFile(oldFile, usage, changes, toMove, program, newModuleName, preferences));
addNewFileToTsconfig(program, changes, oldFile.fileName, newFileNameWithExtension, hostGetCanonicalFileName(host));
}
interface StatementRange {
readonly first: Statement;
readonly afterLast: Statement | undefined;
}
interface ToMove {
readonly all: readonly Statement[];
readonly ranges: readonly StatementRange[];
}
function getStatementsToMove(context: RefactorContext): ToMove | undefined {
const rangeToMove = getRangeToMove(context);
if (rangeToMove === undefined) return undefined;
const all: Statement[] = [];
const ranges: StatementRange[] = [];
const { toMove, afterLast } = rangeToMove;
getRangesWhere(toMove, isAllowedStatementToMove, (start, afterEndIndex) => {
for (let i = start; i < afterEndIndex; i++) all.push(toMove[i]);
ranges.push({ first: toMove[start], afterLast });
});
return all.length === 0 ? undefined : { all, ranges };
}
function isAllowedStatementToMove(statement: Statement): boolean {
// Filters imports and prologue directives out of the range of statements to move.
// Imports will be copied to the new file anyway, and may still be needed in the old file.
// Prologue directives will be copied to the new file and should be left in the old file.
return !isPureImport(statement) && !isPrologueDirective(statement);;
}
function isPureImport(node: Node): boolean {
switch (node.kind) {
case SyntaxKind.ImportDeclaration:
return true;
case SyntaxKind.ImportEqualsDeclaration:
return !hasSyntacticModifier(node, ModifierFlags.Export);
case SyntaxKind.VariableStatement:
return (node as VariableStatement).declarationList.declarations.every(d => !!d.initializer && isRequireCall(d.initializer, /*checkArgumentIsStringLiteralLike*/ true));
default:
return false;
}
}
function addNewFileToTsconfig(program: Program, changes: textChanges.ChangeTracker, oldFileName: string, newFileNameWithExtension: string, getCanonicalFileName: GetCanonicalFileName): void {
const cfg = program.getCompilerOptions().configFile;
if (!cfg) return;
const newFileAbsolutePath = normalizePath(combinePaths(oldFileName, "..", newFileNameWithExtension));
const newFilePath = getRelativePathFromFile(cfg.fileName, newFileAbsolutePath, getCanonicalFileName);
const cfgObject = cfg.statements[0] && tryCast(cfg.statements[0].expression, isObjectLiteralExpression);
const filesProp = cfgObject && find(cfgObject.properties, (prop): prop is PropertyAssignment =>
isPropertyAssignment(prop) && isStringLiteral(prop.name) && prop.name.text === "files");
if (filesProp && isArrayLiteralExpression(filesProp.initializer)) {
changes.insertNodeInListAfter(cfg, last(filesProp.initializer.elements), factory.createStringLiteral(newFilePath), filesProp.initializer.elements);
}
}
function getNewStatementsAndRemoveFromOldFile(
oldFile: SourceFile, usage: UsageInfo, changes: textChanges.ChangeTracker, toMove: ToMove, program: Program, newModuleName: string, preferences: UserPreferences,
) {
const checker = program.getTypeChecker();
const prologueDirectives = takeWhile(oldFile.statements, isPrologueDirective);
if (!oldFile.externalModuleIndicator && !oldFile.commonJsModuleIndicator) {
deleteMovedStatements(oldFile, toMove.ranges, changes);
return [...prologueDirectives, ...toMove.all];
}
const useEsModuleSyntax = !!oldFile.externalModuleIndicator;
const quotePreference = getQuotePreference(oldFile, preferences);
const importsFromNewFile = createOldFileImportsFromNewFile(usage.oldFileImportsFromNewFile, newModuleName, useEsModuleSyntax, quotePreference);
if (importsFromNewFile) {
insertImports(changes, oldFile, importsFromNewFile, /*blankLineBetween*/ true);
}
deleteUnusedOldImports(oldFile, toMove.all, changes, usage.unusedImportsFromOldFile, checker);
deleteMovedStatements(oldFile, toMove.ranges, changes);
updateImportsInOtherFiles(changes, program, oldFile, usage.movedSymbols, newModuleName);
const imports = getNewFileImportsAndAddExportInOldFile(oldFile, usage.oldImportsNeededByNewFile, usage.newFileImportsFromOldFile, changes, checker, useEsModuleSyntax, quotePreference);
const body = addExports(oldFile, toMove.all, usage.oldFileImportsFromNewFile, useEsModuleSyntax);
if (imports.length && body.length) {
return [
...prologueDirectives,
...imports,
SyntaxKind.NewLineTrivia as const,
...body
];
}
return [
...prologueDirectives,
...imports,
...body,
];
}
function deleteMovedStatements(sourceFile: SourceFile, moved: readonly StatementRange[], changes: textChanges.ChangeTracker) {
for (const { first, afterLast } of moved) {
changes.deleteNodeRangeExcludingEnd(sourceFile, first, afterLast);
}
}
function deleteUnusedOldImports(oldFile: SourceFile, toMove: readonly Statement[], changes: textChanges.ChangeTracker, toDelete: ReadonlySymbolSet, checker: TypeChecker) {
for (const statement of oldFile.statements) {
if (contains(toMove, statement)) continue;
forEachImportInStatement(statement, i => deleteUnusedImports(oldFile, i, changes, name => toDelete.has(checker.getSymbolAtLocation(name)!)));
}
}
function updateImportsInOtherFiles(changes: textChanges.ChangeTracker, program: Program, oldFile: SourceFile, movedSymbols: ReadonlySymbolSet, newModuleName: string): void {
const checker = program.getTypeChecker();
for (const sourceFile of program.getSourceFiles()) {
if (sourceFile === oldFile) continue;
for (const statement of sourceFile.statements) {
forEachImportInStatement(statement, importNode => {
if (checker.getSymbolAtLocation(moduleSpecifierFromImport(importNode)) !== oldFile.symbol) return;
const shouldMove = (name: Identifier): boolean => {
const symbol = isBindingElement(name.parent)
? getPropertySymbolFromBindingElement(checker, name.parent as ObjectBindingElementWithoutPropertyName)
: skipAlias(checker.getSymbolAtLocation(name)!, checker); // TODO: GH#18217
return !!symbol && movedSymbols.has(symbol);
};
deleteUnusedImports(sourceFile, importNode, changes, shouldMove); // These will be changed to imports from the new file
const newModuleSpecifier = combinePaths(getDirectoryPath(moduleSpecifierFromImport(importNode).text), newModuleName);
const newImportDeclaration = filterImport(importNode, factory.createStringLiteral(newModuleSpecifier), shouldMove);
if (newImportDeclaration) changes.insertNodeAfter(sourceFile, statement, newImportDeclaration);
const ns = getNamespaceLikeImport(importNode);
if (ns) updateNamespaceLikeImport(changes, sourceFile, checker, movedSymbols, newModuleName, newModuleSpecifier, ns, importNode);
});
}
}
}
function getNamespaceLikeImport(node: SupportedImport): Identifier | undefined {
switch (node.kind) {
case SyntaxKind.ImportDeclaration:
return node.importClause && node.importClause.namedBindings && node.importClause.namedBindings.kind === SyntaxKind.NamespaceImport ?
node.importClause.namedBindings.name : undefined;
case SyntaxKind.ImportEqualsDeclaration:
return node.name;
case SyntaxKind.VariableDeclaration:
return tryCast(node.name, isIdentifier);
default:
return Debug.assertNever(node, `Unexpected node kind ${(node as SupportedImport).kind}`);
}
}
function updateNamespaceLikeImport(
changes: textChanges.ChangeTracker,
sourceFile: SourceFile,
checker: TypeChecker,
movedSymbols: ReadonlySymbolSet,
newModuleName: string,
newModuleSpecifier: string,
oldImportId: Identifier,
oldImportNode: SupportedImport,
): void {
const preferredNewNamespaceName = codefix.moduleSpecifierToValidIdentifier(newModuleName, ScriptTarget.ESNext);
let needUniqueName = false;
const toChange: Identifier[] = [];
FindAllReferences.Core.eachSymbolReferenceInFile(oldImportId, checker, sourceFile, ref => {
if (!isPropertyAccessExpression(ref.parent)) return;
needUniqueName = needUniqueName || !!checker.resolveName(preferredNewNamespaceName, ref, SymbolFlags.All, /*excludeGlobals*/ true);
if (movedSymbols.has(checker.getSymbolAtLocation(ref.parent.name)!)) {
toChange.push(ref);
}
});
if (toChange.length) {
const newNamespaceName = needUniqueName ? getUniqueName(preferredNewNamespaceName, sourceFile) : preferredNewNamespaceName;
for (const ref of toChange) {
changes.replaceNode(sourceFile, ref, factory.createIdentifier(newNamespaceName));
}
changes.insertNodeAfter(sourceFile, oldImportNode, updateNamespaceLikeImportNode(oldImportNode, newModuleName, newModuleSpecifier));
}
}
function updateNamespaceLikeImportNode(node: SupportedImport, newNamespaceName: string, newModuleSpecifier: string): Node {
const newNamespaceId = factory.createIdentifier(newNamespaceName);
const newModuleString = factory.createStringLiteral(newModuleSpecifier);
switch (node.kind) {
case SyntaxKind.ImportDeclaration:
return factory.createImportDeclaration(
/*modifiers*/ undefined,
factory.createImportClause(/*isTypeOnly*/ false, /*name*/ undefined, factory.createNamespaceImport(newNamespaceId)),
newModuleString,
/*assertClause*/ undefined);
case SyntaxKind.ImportEqualsDeclaration:
return factory.createImportEqualsDeclaration(/*modifiers*/ undefined, /*isTypeOnly*/ false, newNamespaceId, factory.createExternalModuleReference(newModuleString));
case SyntaxKind.VariableDeclaration:
return factory.createVariableDeclaration(newNamespaceId, /*exclamationToken*/ undefined, /*type*/ undefined, createRequireCall(newModuleString));
default:
return Debug.assertNever(node, `Unexpected node kind ${(node as SupportedImport).kind}`);
}
}
function moduleSpecifierFromImport(i: SupportedImport): StringLiteralLike {
return (i.kind === SyntaxKind.ImportDeclaration ? i.moduleSpecifier
: i.kind === SyntaxKind.ImportEqualsDeclaration ? i.moduleReference.expression
: i.initializer.arguments[0]);
}
function forEachImportInStatement(statement: Statement, cb: (importNode: SupportedImport) => void): void {
if (isImportDeclaration(statement)) {
if (isStringLiteral(statement.moduleSpecifier)) cb(statement as SupportedImport);
}
else if (isImportEqualsDeclaration(statement)) {
if (isExternalModuleReference(statement.moduleReference) && isStringLiteralLike(statement.moduleReference.expression)) {
cb(statement as SupportedImport);
}
}
else if (isVariableStatement(statement)) {
for (const decl of statement.declarationList.declarations) {
if (decl.initializer && isRequireCall(decl.initializer, /*checkArgumentIsStringLiteralLike*/ true)) {
cb(decl as SupportedImport);
}
}
}
}
type SupportedImport =
| ImportDeclaration & { moduleSpecifier: StringLiteralLike }
| ImportEqualsDeclaration & { moduleReference: ExternalModuleReference & { expression: StringLiteralLike } }
| VariableDeclaration & { initializer: RequireOrImportCall };
type SupportedImportStatement =
| ImportDeclaration
| ImportEqualsDeclaration
| VariableStatement;
function createOldFileImportsFromNewFile(newFileNeedExport: ReadonlySymbolSet, newFileNameWithExtension: string, useEs6Imports: boolean, quotePreference: QuotePreference): AnyImportOrRequireStatement | undefined {
let defaultImport: Identifier | undefined;
const imports: string[] = [];
newFileNeedExport.forEach(symbol => {
if (symbol.escapedName === InternalSymbolName.Default) {
defaultImport = factory.createIdentifier(symbolNameNoDefault(symbol)!); // TODO: GH#18217
}
else {
imports.push(symbol.name);
}
});
return makeImportOrRequire(defaultImport, imports, newFileNameWithExtension, useEs6Imports, quotePreference);
}
function makeImportOrRequire(defaultImport: Identifier | undefined, imports: readonly string[], path: string, useEs6Imports: boolean, quotePreference: QuotePreference): AnyImportOrRequireStatement | undefined {
path = ensurePathIsNonModuleName(path);
if (useEs6Imports) {
const specifiers = imports.map(i => factory.createImportSpecifier(/*isTypeOnly*/ false, /*propertyName*/ undefined, factory.createIdentifier(i)));
return makeImportIfNecessary(defaultImport, specifiers, path, quotePreference);
}
else {
Debug.assert(!defaultImport, "No default import should exist"); // If there's a default export, it should have been an es6 module.
const bindingElements = imports.map(i => factory.createBindingElement(/*dotDotDotToken*/ undefined, /*propertyName*/ undefined, i));
return bindingElements.length
? makeVariableStatement(factory.createObjectBindingPattern(bindingElements), /*type*/ undefined, createRequireCall(factory.createStringLiteral(path))) as RequireVariableStatement
: undefined;
}
}
function makeVariableStatement(name: BindingName, type: TypeNode | undefined, initializer: Expression | undefined, flags: NodeFlags = NodeFlags.Const) {
return factory.createVariableStatement(/*modifiers*/ undefined, factory.createVariableDeclarationList([factory.createVariableDeclaration(name, /*exclamationToken*/ undefined, type, initializer)], flags));
}
function createRequireCall(moduleSpecifier: StringLiteralLike): CallExpression {
return factory.createCallExpression(factory.createIdentifier("require"), /*typeArguments*/ undefined, [moduleSpecifier]);
}
function addExports(sourceFile: SourceFile, toMove: readonly Statement[], needExport: ReadonlySymbolSet, useEs6Exports: boolean): readonly Statement[] {
return flatMap(toMove, statement => {
if (isTopLevelDeclarationStatement(statement) &&
!isExported(sourceFile, statement, useEs6Exports) &&
forEachTopLevelDeclaration(statement, d => needExport.has(Debug.checkDefined(d.symbol)))) {
const exports = addExport(statement, useEs6Exports);
if (exports) return exports;
}
return statement;
});
}
function deleteUnusedImports(sourceFile: SourceFile, importDecl: SupportedImport, changes: textChanges.ChangeTracker, isUnused: (name: Identifier) => boolean): void {
switch (importDecl.kind) {
case SyntaxKind.ImportDeclaration:
deleteUnusedImportsInDeclaration(sourceFile, importDecl, changes, isUnused);
break;
case SyntaxKind.ImportEqualsDeclaration:
if (isUnused(importDecl.name)) {
changes.delete(sourceFile, importDecl);
}
break;
case SyntaxKind.VariableDeclaration:
deleteUnusedImportsInVariableDeclaration(sourceFile, importDecl, changes, isUnused);
break;
default:
Debug.assertNever(importDecl, `Unexpected import decl kind ${(importDecl as SupportedImport).kind}`);
}
}
function deleteUnusedImportsInDeclaration(sourceFile: SourceFile, importDecl: ImportDeclaration, changes: textChanges.ChangeTracker, isUnused: (name: Identifier) => boolean): void {
if (!importDecl.importClause) return;
const { name, namedBindings } = importDecl.importClause;
const defaultUnused = !name || isUnused(name);
const namedBindingsUnused = !namedBindings ||
(namedBindings.kind === SyntaxKind.NamespaceImport ? isUnused(namedBindings.name) : namedBindings.elements.length !== 0 && namedBindings.elements.every(e => isUnused(e.name)));
if (defaultUnused && namedBindingsUnused) {
changes.delete(sourceFile, importDecl);
}
else {
if (name && defaultUnused) {
changes.delete(sourceFile, name);
}
if (namedBindings) {
if (namedBindingsUnused) {
changes.replaceNode(
sourceFile,
importDecl.importClause,
factory.updateImportClause(importDecl.importClause, importDecl.importClause.isTypeOnly, name, /*namedBindings*/ undefined)
);
}
else if (namedBindings.kind === SyntaxKind.NamedImports) {
for (const element of namedBindings.elements) {
if (isUnused(element.name)) changes.delete(sourceFile, element);
}
}
}
}
}
function deleteUnusedImportsInVariableDeclaration(sourceFile: SourceFile, varDecl: VariableDeclaration, changes: textChanges.ChangeTracker, isUnused: (name: Identifier) => boolean) {
const { name } = varDecl;
switch (name.kind) {
case SyntaxKind.Identifier:
if (isUnused(name)) {
if (varDecl.initializer && isRequireCall(varDecl.initializer, /*requireStringLiteralLikeArgument*/ true)) {
changes.delete(sourceFile,
isVariableDeclarationList(varDecl.parent) && length(varDecl.parent.declarations) === 1 ? varDecl.parent.parent : varDecl);
}
else {
changes.delete(sourceFile, name);
}
}
break;
case SyntaxKind.ArrayBindingPattern:
break;
case SyntaxKind.ObjectBindingPattern:
if (name.elements.every(e => isIdentifier(e.name) && isUnused(e.name))) {
changes.delete(sourceFile,
isVariableDeclarationList(varDecl.parent) && varDecl.parent.declarations.length === 1 ? varDecl.parent.parent : varDecl);
}
else {
for (const element of name.elements) {
if (isIdentifier(element.name) && isUnused(element.name)) {
changes.delete(sourceFile, element.name);
}
}
}
break;
}
}
function getNewFileImportsAndAddExportInOldFile(
oldFile: SourceFile,
importsToCopy: ReadonlySymbolSet,
newFileImportsFromOldFile: ReadonlySymbolSet,
changes: textChanges.ChangeTracker,
checker: TypeChecker,
useEsModuleSyntax: boolean,
quotePreference: QuotePreference,
): readonly SupportedImportStatement[] {
const copiedOldImports: SupportedImportStatement[] = [];
for (const oldStatement of oldFile.statements) {
forEachImportInStatement(oldStatement, i => {
append(copiedOldImports, filterImport(i, moduleSpecifierFromImport(i), name => importsToCopy.has(checker.getSymbolAtLocation(name)!)));
});
}
// Also, import things used from the old file, and insert 'export' modifiers as necessary in the old file.
let oldFileDefault: Identifier | undefined;
const oldFileNamedImports: string[] = [];
const markSeenTop = nodeSeenTracker(); // Needed because multiple declarations may appear in `const x = 0, y = 1;`.
newFileImportsFromOldFile.forEach(symbol => {
if (!symbol.declarations) {
return;
}
for (const decl of symbol.declarations) {
if (!isTopLevelDeclaration(decl)) continue;
const name = nameOfTopLevelDeclaration(decl);
if (!name) continue;
const top = getTopLevelDeclarationStatement(decl);
if (markSeenTop(top)) {
addExportToChanges(oldFile, top, name, changes, useEsModuleSyntax);
}
if (hasSyntacticModifier(decl, ModifierFlags.Default)) {
oldFileDefault = name;
}
else {
oldFileNamedImports.push(name.text);
}
}
});
append(copiedOldImports, makeImportOrRequire(oldFileDefault, oldFileNamedImports, removeFileExtension(getBaseFileName(oldFile.fileName)), useEsModuleSyntax, quotePreference));
return copiedOldImports;
}
function makeUniqueModuleName(moduleName: string, extension: string, inDirectory: string, host: LanguageServiceHost): string {
let newModuleName = moduleName;
for (let i = 1; ; i++) {
const name = combinePaths(inDirectory, newModuleName + extension);
if (!host.fileExists(name)) return newModuleName;
newModuleName = `${moduleName}.${i}`;
}
}
function getNewModuleName(importsFromNewFile: ReadonlySymbolSet, movedSymbols: ReadonlySymbolSet): string {
return importsFromNewFile.forEachEntry(symbolNameNoDefault) || movedSymbols.forEachEntry(symbolNameNoDefault) || "newFile";
}
interface UsageInfo {
// Symbols whose declarations are moved from the old file to the new file.
readonly movedSymbols: ReadonlySymbolSet;
// Symbols declared in the old file that must be imported by the new file. (May not already be exported.)
readonly newFileImportsFromOldFile: ReadonlySymbolSet;
// Subset of movedSymbols that are still used elsewhere in the old file and must be imported back.
readonly oldFileImportsFromNewFile: ReadonlySymbolSet;
readonly oldImportsNeededByNewFile: ReadonlySymbolSet;
// Subset of oldImportsNeededByNewFile that are will no longer be used in the old file.
readonly unusedImportsFromOldFile: ReadonlySymbolSet;
}
function getUsageInfo(oldFile: SourceFile, toMove: readonly Statement[], checker: TypeChecker): UsageInfo {
const movedSymbols = new SymbolSet();
const oldImportsNeededByNewFile = new SymbolSet();
const newFileImportsFromOldFile = new SymbolSet();
const containsJsx = find(toMove, statement => !!(statement.transformFlags & TransformFlags.ContainsJsx));
const jsxNamespaceSymbol = getJsxNamespaceSymbol(containsJsx);
if (jsxNamespaceSymbol) { // Might not exist (e.g. in non-compiling code)
oldImportsNeededByNewFile.add(jsxNamespaceSymbol);
}
for (const statement of toMove) {
forEachTopLevelDeclaration(statement, decl => {
movedSymbols.add(Debug.checkDefined(isExpressionStatement(decl) ? checker.getSymbolAtLocation(decl.expression.left) : decl.symbol, "Need a symbol here"));
});
}
for (const statement of toMove) {
forEachReference(statement, checker, symbol => {
if (!symbol.declarations) return;
for (const decl of symbol.declarations) {
if (isInImport(decl)) {
oldImportsNeededByNewFile.add(symbol);
}
else if (isTopLevelDeclaration(decl) && sourceFileOfTopLevelDeclaration(decl) === oldFile && !movedSymbols.has(symbol)) {
newFileImportsFromOldFile.add(symbol);
}
}
});
}
const unusedImportsFromOldFile = oldImportsNeededByNewFile.clone();
const oldFileImportsFromNewFile = new SymbolSet();
for (const statement of oldFile.statements) {
if (contains(toMove, statement)) continue;
// jsxNamespaceSymbol will only be set iff it is in oldImportsNeededByNewFile.
if (jsxNamespaceSymbol && !!(statement.transformFlags & TransformFlags.ContainsJsx)) {
unusedImportsFromOldFile.delete(jsxNamespaceSymbol);
}
forEachReference(statement, checker, symbol => {
if (movedSymbols.has(symbol)) oldFileImportsFromNewFile.add(symbol);
unusedImportsFromOldFile.delete(symbol);
});
}
return { movedSymbols, newFileImportsFromOldFile, oldFileImportsFromNewFile, oldImportsNeededByNewFile, unusedImportsFromOldFile };
function getJsxNamespaceSymbol(containsJsx: Node | undefined) {
if (containsJsx === undefined) {
return undefined;
}
const jsxNamespace = checker.getJsxNamespace(containsJsx);
// Strictly speaking, this could resolve to a symbol other than the JSX namespace.
// This will produce erroneous output (probably, an incorrectly copied import) but
// is expected to be very rare and easily reversible.
const jsxNamespaceSymbol = checker.resolveName(jsxNamespace, containsJsx, SymbolFlags.Namespace, /*excludeGlobals*/ true);
return !!jsxNamespaceSymbol && some(jsxNamespaceSymbol.declarations, isInImport)
? jsxNamespaceSymbol
: undefined;
}
}
// Below should all be utilities
function isInImport(decl: Declaration) {
switch (decl.kind) {
case SyntaxKind.ImportEqualsDeclaration:
case SyntaxKind.ImportSpecifier:
case SyntaxKind.ImportClause:
case SyntaxKind.NamespaceImport:
return true;
case SyntaxKind.VariableDeclaration:
return isVariableDeclarationInImport(decl as VariableDeclaration);
case SyntaxKind.BindingElement:
return isVariableDeclaration(decl.parent.parent) && isVariableDeclarationInImport(decl.parent.parent);
default:
return false;
}
}
function isVariableDeclarationInImport(decl: VariableDeclaration) {
return isSourceFile(decl.parent.parent.parent) &&
!!decl.initializer && isRequireCall(decl.initializer, /*checkArgumentIsStringLiteralLike*/ true);
}
function filterImport(i: SupportedImport, moduleSpecifier: StringLiteralLike, keep: (name: Identifier) => boolean): SupportedImportStatement | undefined {
switch (i.kind) {
case SyntaxKind.ImportDeclaration: {
const clause = i.importClause;
if (!clause) return undefined;
const defaultImport = clause.name && keep(clause.name) ? clause.name : undefined;
const namedBindings = clause.namedBindings && filterNamedBindings(clause.namedBindings, keep);
return defaultImport || namedBindings
? factory.createImportDeclaration(/*modifiers*/ undefined, factory.createImportClause(/*isTypeOnly*/ false, defaultImport, namedBindings), moduleSpecifier, /*assertClause*/ undefined)
: undefined;
}
case SyntaxKind.ImportEqualsDeclaration:
return keep(i.name) ? i : undefined;
case SyntaxKind.VariableDeclaration: {
const name = filterBindingName(i.name, keep);
return name ? makeVariableStatement(name, i.type, createRequireCall(moduleSpecifier), i.parent.flags) : undefined;
}
default:
return Debug.assertNever(i, `Unexpected import kind ${(i as SupportedImport).kind}`);
}
}
function filterNamedBindings(namedBindings: NamedImportBindings, keep: (name: Identifier) => boolean): NamedImportBindings | undefined {
if (namedBindings.kind === SyntaxKind.NamespaceImport) {
return keep(namedBindings.name) ? namedBindings : undefined;
}
else {
const newElements = namedBindings.elements.filter(e => keep(e.name));
return newElements.length ? factory.createNamedImports(newElements) : undefined;
}
}
function filterBindingName(name: BindingName, keep: (name: Identifier) => boolean): BindingName | undefined {
switch (name.kind) {
case SyntaxKind.Identifier:
return keep(name) ? name : undefined;
case SyntaxKind.ArrayBindingPattern:
return name;
case SyntaxKind.ObjectBindingPattern: {
// We can't handle nested destructurings or property names well here, so just copy them all.
const newElements = name.elements.filter(prop => prop.propertyName || !isIdentifier(prop.name) || keep(prop.name));
return newElements.length ? factory.createObjectBindingPattern(newElements) : undefined;
}
}
}
function forEachReference(node: Node, checker: TypeChecker, onReference: (s: Symbol) => void) {
node.forEachChild(function cb(node) {
if (isIdentifier(node) && !isDeclarationName(node)) {
const sym = checker.getSymbolAtLocation(node);
if (sym) onReference(sym);
}
else {
node.forEachChild(cb);
}
});
}
interface ReadonlySymbolSet {
has(symbol: Symbol): boolean;
forEach(cb: (symbol: Symbol) => void): void;
forEachEntry<T>(cb: (symbol: Symbol) => T | undefined): T | undefined;
}
class SymbolSet implements ReadonlySymbolSet {
private map = new Map<string, Symbol>();
add(symbol: Symbol): void {
this.map.set(String(getSymbolId(symbol)), symbol);
}
has(symbol: Symbol): boolean {
return this.map.has(String(getSymbolId(symbol)));
}
delete(symbol: Symbol): void {
this.map.delete(String(getSymbolId(symbol)));
}
forEach(cb: (symbol: Symbol) => void): void {
this.map.forEach(cb);
}
forEachEntry<T>(cb: (symbol: Symbol) => T | undefined): T | undefined {
return forEachEntry(this.map, cb);
}
clone(): SymbolSet {
const clone = new SymbolSet();
copyEntries(this.map, clone.map);
return clone;
}
}
type TopLevelExpressionStatement = ExpressionStatement & { expression: BinaryExpression & { left: PropertyAccessExpression } }; // 'exports.x = ...'
type NonVariableTopLevelDeclaration =
| FunctionDeclaration
| ClassDeclaration
| EnumDeclaration
| TypeAliasDeclaration
| InterfaceDeclaration
| ModuleDeclaration
| TopLevelExpressionStatement
| ImportEqualsDeclaration;
type TopLevelDeclarationStatement = NonVariableTopLevelDeclaration | VariableStatement;
interface TopLevelVariableDeclaration extends VariableDeclaration { parent: VariableDeclarationList & { parent: VariableStatement; }; }
type TopLevelDeclaration = NonVariableTopLevelDeclaration | TopLevelVariableDeclaration | BindingElement;
function isTopLevelDeclaration(node: Node): node is TopLevelDeclaration {
return isNonVariableTopLevelDeclaration(node) && isSourceFile(node.parent) || isVariableDeclaration(node) && isSourceFile(node.parent.parent.parent);
}
function sourceFileOfTopLevelDeclaration(node: TopLevelDeclaration): Node {
return isVariableDeclaration(node) ? node.parent.parent.parent : node.parent;
}
function isTopLevelDeclarationStatement(node: Node): node is TopLevelDeclarationStatement {
Debug.assert(isSourceFile(node.parent), "Node parent should be a SourceFile");
return isNonVariableTopLevelDeclaration(node) || isVariableStatement(node);
}
function isNonVariableTopLevelDeclaration(node: Node): node is NonVariableTopLevelDeclaration {
switch (node.kind) {
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.TypeAliasDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.ImportEqualsDeclaration:
return true;
default:
return false;
}
}
function forEachTopLevelDeclaration<T>(statement: Statement, cb: (node: TopLevelDeclaration) => T): T | undefined {
switch (statement.kind) {
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.TypeAliasDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.ImportEqualsDeclaration:
return cb(statement as FunctionDeclaration | ClassDeclaration | EnumDeclaration | ModuleDeclaration | TypeAliasDeclaration | InterfaceDeclaration | ImportEqualsDeclaration);
case SyntaxKind.VariableStatement:
return firstDefined((statement as VariableStatement).declarationList.declarations, decl => forEachTopLevelDeclarationInBindingName(decl.name, cb));
case SyntaxKind.ExpressionStatement: {
const { expression } = statement as ExpressionStatement;
return isBinaryExpression(expression) && getAssignmentDeclarationKind(expression) === AssignmentDeclarationKind.ExportsProperty
? cb(statement as TopLevelExpressionStatement)
: undefined;
}
}
}
function forEachTopLevelDeclarationInBindingName<T>(name: BindingName, cb: (node: TopLevelDeclaration) => T): T | undefined {
switch (name.kind) {
case SyntaxKind.Identifier:
return cb(cast(name.parent, (x): x is TopLevelVariableDeclaration | BindingElement => isVariableDeclaration(x) || isBindingElement(x)));
case SyntaxKind.ArrayBindingPattern:
case SyntaxKind.ObjectBindingPattern:
return firstDefined(name.elements, em => isOmittedExpression(em) ? undefined : forEachTopLevelDeclarationInBindingName(em.name, cb));
default:
return Debug.assertNever(name, `Unexpected name kind ${(name as BindingName).kind}`);
}
}
function nameOfTopLevelDeclaration(d: TopLevelDeclaration): Identifier | undefined {
return isExpressionStatement(d) ? tryCast(d.expression.left.name, isIdentifier) : tryCast(d.name, isIdentifier);
}
function getTopLevelDeclarationStatement(d: TopLevelDeclaration): TopLevelDeclarationStatement {
switch (d.kind) {
case SyntaxKind.VariableDeclaration:
return d.parent.parent;
case SyntaxKind.BindingElement:
return getTopLevelDeclarationStatement(
cast(d.parent.parent, (p): p is TopLevelVariableDeclaration | BindingElement => isVariableDeclaration(p) || isBindingElement(p)));
default:
return d;
}
}
function addExportToChanges(sourceFile: SourceFile, decl: TopLevelDeclarationStatement, name: Identifier, changes: textChanges.ChangeTracker, useEs6Exports: boolean): void {
if (isExported(sourceFile, decl, useEs6Exports, name)) return;
if (useEs6Exports) {
if (!isExpressionStatement(decl)) changes.insertExportModifier(sourceFile, decl);
}
else {
const names = getNamesToExportInCommonJS(decl);
if (names.length !== 0) changes.insertNodesAfter(sourceFile, decl, names.map(createExportAssignment));
}
}
function isExported(sourceFile: SourceFile, decl: TopLevelDeclarationStatement, useEs6Exports: boolean, name?: Identifier): boolean {
if (useEs6Exports) {
return !isExpressionStatement(decl) && hasSyntacticModifier(decl, ModifierFlags.Export) || !!(name && sourceFile.symbol.exports?.has(name.escapedText));
}
return getNamesToExportInCommonJS(decl).some(name => sourceFile.symbol.exports!.has(escapeLeadingUnderscores(name)));
}
function addExport(decl: TopLevelDeclarationStatement, useEs6Exports: boolean): readonly Statement[] | undefined {
return useEs6Exports ? [addEs6Export(decl)] : addCommonjsExport(decl);
}
function addEs6Export(d: TopLevelDeclarationStatement): TopLevelDeclarationStatement {
const modifiers = canHaveModifiers(d) ? concatenate([factory.createModifier(SyntaxKind.ExportKeyword)], getModifiers(d)) : undefined;
switch (d.kind) {
case SyntaxKind.FunctionDeclaration:
return factory.updateFunctionDeclaration(d, modifiers, d.asteriskToken, d.name, d.typeParameters, d.parameters, d.type, d.body);
case SyntaxKind.ClassDeclaration:
const decorators = canHaveDecorators(d) ? getDecorators(d) : undefined;
return factory.updateClassDeclaration(d, concatenate<ModifierLike>(decorators, modifiers), d.name, d.typeParameters, d.heritageClauses, d.members);
case SyntaxKind.VariableStatement:
return factory.updateVariableStatement(d, modifiers, d.declarationList);
case SyntaxKind.ModuleDeclaration:
return factory.updateModuleDeclaration(d, modifiers, d.name, d.body);
case SyntaxKind.EnumDeclaration:
return factory.updateEnumDeclaration(d, modifiers, d.name, d.members);
case SyntaxKind.TypeAliasDeclaration:
return factory.updateTypeAliasDeclaration(d, modifiers, d.name, d.typeParameters, d.type);
case SyntaxKind.InterfaceDeclaration:
return factory.updateInterfaceDeclaration(d, modifiers, d.name, d.typeParameters, d.heritageClauses, d.members);
case SyntaxKind.ImportEqualsDeclaration:
return factory.updateImportEqualsDeclaration(d, modifiers, d.isTypeOnly, d.name, d.moduleReference);
case SyntaxKind.ExpressionStatement:
return Debug.fail(); // Shouldn't try to add 'export' keyword to `exports.x = ...`
default:
return Debug.assertNever(d, `Unexpected declaration kind ${(d as DeclarationStatement).kind}`);
}
}
function addCommonjsExport(decl: TopLevelDeclarationStatement): readonly Statement[] | undefined {
return [decl, ...getNamesToExportInCommonJS(decl).map(createExportAssignment)];
}
function getNamesToExportInCommonJS(decl: TopLevelDeclarationStatement): readonly string[] {
switch (decl.kind) {
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.ClassDeclaration:
return [decl.name!.text]; // TODO: GH#18217
case SyntaxKind.VariableStatement:
return mapDefined(decl.declarationList.declarations, d => isIdentifier(d.name) ? d.name.text : undefined);
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.TypeAliasDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.ImportEqualsDeclaration:
return emptyArray;
case SyntaxKind.ExpressionStatement:
return Debug.fail("Can't export an ExpressionStatement"); // Shouldn't try to add 'export' keyword to `exports.x = ...`
default:
return Debug.assertNever(decl, `Unexpected decl kind ${(decl as TopLevelDeclarationStatement).kind}`);
}
}
/** Creates `exports.x = x;` */
function createExportAssignment(name: string): Statement {
return factory.createExpressionStatement(
factory.createBinaryExpression(
factory.createPropertyAccessExpression(factory.createIdentifier("exports"), factory.createIdentifier(name)),
SyntaxKind.EqualsToken,
factory.createIdentifier(name)));
}
}