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// based on https://github.com/dsherret/code-block-writer/blob/99454249cd13bd89befa45ac815b37b3e02896f5/scripts/build_npm.ts
import { Context } from "./context.ts";import { Node, SourceFile } from "./deps.deno.ts";import { transpileSpecifier } from "./_transformations/specifiers.ts";import { vendorEverything } from "./_transformations/vendor.ts";
function transpileImportSpecifiers(sourceFile: SourceFile) {  for (const statement of sourceFile.getStatements()) {    if (      Node.isImportDeclaration(statement) ||      Node.isExportDeclaration(statement)    ) {      const modSpecifierValue = statement.getModuleSpecifierValue();      if (modSpecifierValue !== undefined) {        statement.setModuleSpecifier(transpileSpecifier(modSpecifierValue));      }    }  }}
function createShimmer(ctx: Context) {  if (ctx.config.shim === undefined) {    return () => {};  }  const shimFile = ctx.project.addSourceFileAtPath(    ctx.resolve(ctx.config.shim),  );  const shims = Array.from(shimFile.getExportedDeclarations().keys());  return (sourceFile: SourceFile) => {    if (sourceFile === shimFile) return;    const locals = new Set(      sourceFile.getLocals().map((l) => l.getEscapedName()),    );    const index = sourceFile.getStatementsWithComments().length;    const moduleSpecifier = "./" +      sourceFile.getRelativePathTo(shimFile).replace(        /tsx?$/,        "js",      );    sourceFile.insertImportDeclaration(index, {      // do not shim declared locals      namedImports: shims.filter((s) => !locals.has(s)),      moduleSpecifier,    });  };}
const isDenoSpecific = (sourceFile: SourceFile) =>  sourceFile.getBaseNameWithoutExtension().toLowerCase().endsWith(".deno");
const isNodeSpecific = (sourceFile: SourceFile) =>  sourceFile.getBaseNameWithoutExtension().toLowerCase().endsWith(".node");
/** * Attempts to transform arbitrary `ctx.project` into a valid Node.js project: * * 1. Changes import specifiers to be Node-friendly: *    - changes extension in relative specifiers to `.js`, *    - replaces some `https://` imports with bare specifiers. * * 2. Changes `*.deno.js` imports specifiers to `*.node.js` *    (`import './deps.deno.ts'` -> `import './deps.node.js'`). *    This can be used for re-exporting dependencies *    and other runtime-specific code. * * 3. Rewrites remaining https: imports to point *    into `vendorDir`, if specified: *    ```json *    // @filename: tsconfig.json *    { *      "deno2node": { *        "vendorDir": "src/.deno2node/vendor/" *      } *    } *    ``` * * 4. Imports Node.js shims for Deno globals *    from [shim file], if specified: *    ```json *    // @filename: tsconfig.json *    { *      "deno2node": { *        "shim": "src/shim.node.ts" *      } *    } *    ``` * * [shim file]: https://github.com/wojpawlik/deno2node/blob/main/src/shim.node.ts */export async function deno2node(ctx: Context): Promise<void> {  const shim = createShimmer(ctx);  console.time("Basic transformations");  for (const sourceFile of ctx.project.getSourceFiles()) {    if (isDenoSpecific(sourceFile)) {      ctx.project.removeSourceFile(sourceFile);      continue;    }    transpileImportSpecifiers(sourceFile);  }  console.timeEnd("Basic transformations");  console.time("Vendoring");  await vendorEverything(ctx);  console.timeEnd("Vendoring");  console.time("Shimming");  for (const sourceFile of ctx.project.getSourceFiles()) {    if (!isNodeSpecific(sourceFile)) {      shim(sourceFile);    }  }  console.timeEnd("Shimming");}