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import * as ts from "typescript";

const transformSourceFile: ts.Transformer<ts.SourceFile> = node => {

const empty = ts.createNotEmittedStatement(undefined!);

ts.addSyntheticLeadingComment(empty, ts.SyntaxKind.MultiLineCommentTrivia, "* @noSelfInFile ", true);

return ts.updateSourceFileNode(node, [empty, ...node.statements], node.isDeclarationFile);

};

export const noImplicitSelfTransformer: ts.TransformerFactory<ts.SourceFile | ts.Bundle> = () => node =>

ts.isBundle(node) ? ts.updateBundle(node, node.sourceFiles.map(transformSourceFile)) : transformSourceFile(node);