12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { ts } from "./mod.deps.ts";
// transform `import.meta.url` to a replacement that works in script modulesexport const transformImportMeta: ts.TransformerFactory<ts.SourceFile> = (  context,) => {  const factory = context.factory;
  return (sourceFile) => ts.visitEachChild(sourceFile, visitNode, context);
  function visitNode(node: ts.Node): ts.Node {    // find `import.meta.url`    if (      ts.isPropertyAccessExpression(node) &&      ts.isMetaProperty(node.expression) &&      node.expression.keywordToken === ts.SyntaxKind.ImportKeyword &&      ts.isIdentifier(node.name)    ) {      if (node.name.escapedText === "url") {        return getReplacementImportMetaUrl();      } else if (node.name.escapedText === "main") {        return getReplacementImportMetaMain();      }    }
    return ts.visitEachChild(node, visitNode, context);  }
  function getReplacementImportMetaUrl() {    // Copy and pasted from ts-ast-viewer.com    // require("url").pathToFileURL(__filename).href    return factory.createPropertyAccessExpression(      factory.createCallExpression(        factory.createPropertyAccessExpression(          factory.createCallExpression(            factory.createIdentifier("require"),            undefined,            [factory.createStringLiteral("url")],          ),          factory.createIdentifier("pathToFileURL"),        ),        undefined,        [factory.createIdentifier("__filename")],      ),      factory.createIdentifier("href"),    );  }
  function getReplacementImportMetaMain() {    // Copy and pasted from ts-ast-viewer.com    // (require.main === module)    return factory.createParenthesizedExpression(factory.createBinaryExpression(      factory.createPropertyAccessExpression(        factory.createIdentifier("require"),        factory.createIdentifier("main"),      ),      factory.createToken(ts.SyntaxKind.EqualsEqualsEqualsToken),      factory.createIdentifier("module"),    ));  }};