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import type { Diagnostic, MemoryEmitResultFile, Project } from "./deps.deno.ts";
const anyShebang = /^#![^\n]*\n/;const denoShebang = /^#!\/usr\/bin\/env -S deno run\b[^\n]*\n/;const nodeShebang = "#!/usr/bin/env node\n";
function transpileShebang(file: MemoryEmitResultFile) {  file.text = file.filePath.endsWith(".js")    ? file.text.replace(denoShebang, nodeShebang)    : file.text.replace(anyShebang, "\n");}
async function markExecutableIfNeeded(file: MemoryEmitResultFile) {  if (Deno.build.os === "windows") return;  if (!file.text.startsWith(nodeShebang)) return;  await Deno.chmod(file.filePath, 0o755);}
/** * Emits project to the filesystem. * Returns diagnostics. * * Replaces Deno shebang with Node.js shebang in JS outputs. * Removes shebangs from non-JS outputs. * Then `chmod +x`'s outputs with Node.js shebang. */export async function emit(project: Project): Promise<Diagnostic[]> {  const result = project.emitToMemory();  const files = result.getFiles();  files.forEach(transpileShebang);  await result.saveFiles();  await Promise.all(files.map(markExecutableIfNeeded));  const preEmitDiagnostics = project.getPreEmitDiagnostics();  if (preEmitDiagnostics.length !== 0) return preEmitDiagnostics;  return result.getDiagnostics();}