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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.use deno_core::include_crate_modules;use deno_core::Isolate;use deno_core::StartupData;use std::collections::HashMap;use std::env;use std::path::PathBuf;
fn main() {  // Don't build V8 if "cargo doc" is being run. This is to support docs.rs.  if env::var_os("RUSTDOCFLAGS").is_some() {    return;  }
  // To debug snapshot issues uncomment:  // deno_typescript::trace_serializer();
  println!(    "cargo:rustc-env=TS_VERSION={}",    deno_typescript::ts_version()  );
  let extern_crate_modules = include_crate_modules![deno_core];
  // The generation of snapshots is slow and often unnecessary. Until we figure  // out how to speed it up, or avoid it when unnecessary, this env var provides  // an escape hatch for the impatient hacker in need of faster incremental  // builds.  // USE WITH EXTREME CAUTION  if env::var_os("NO_BUILD_SNAPSHOTS").is_some() {    println!("NO_BUILD_SNAPSHOTS is set, skipping snapshot building.");    return;  }
  let c = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap());  let o = PathBuf::from(env::var_os("OUT_DIR").unwrap());
  // Main snapshot  let root_names = vec![c.join("js/main.ts")];  let bundle_path = o.join("CLI_SNAPSHOT.js");  let snapshot_path = o.join("CLI_SNAPSHOT.bin");
  let main_module_name = deno_typescript::compile_bundle(    &bundle_path,    root_names,    Some(extern_crate_modules.clone()),  )  .expect("Bundle compilation failed");  assert!(bundle_path.exists());
  let runtime_isolate = &mut Isolate::new(StartupData::None, true);
  deno_typescript::mksnapshot_bundle(    runtime_isolate,    &snapshot_path,    &bundle_path,    &main_module_name,  )  .expect("Failed to create snapshot");
  // Compiler snapshot  let root_names = vec![c.join("js/compiler.ts")];  let bundle_path = o.join("COMPILER_SNAPSHOT.js");  let snapshot_path = o.join("COMPILER_SNAPSHOT.bin");
  let main_module_name = deno_typescript::compile_bundle(    &bundle_path,    root_names,    Some(extern_crate_modules),  )  .expect("Bundle compilation failed");  assert!(bundle_path.exists());
  let runtime_isolate = &mut Isolate::new(StartupData::None, true);
  let mut custom_libs: HashMap<String, PathBuf> = HashMap::new();  custom_libs.insert(    "lib.deno.window.d.ts".to_string(),    c.join("js/lib.deno.window.d.ts"),  );  custom_libs.insert(    "lib.deno.worker.d.ts".to_string(),    c.join("js/lib.deno.worker.d.ts"),  );  custom_libs.insert(    "lib.deno.shared_globals.d.ts".to_string(),    c.join("js/lib.deno.shared_globals.d.ts"),  );  custom_libs.insert(    "lib.deno.ns.d.ts".to_string(),    c.join("js/lib.deno.ns.d.ts"),  );  runtime_isolate.register_op(    "op_fetch_asset",    deno_typescript::op_fetch_asset(custom_libs),  );
  deno_typescript::mksnapshot_bundle_ts(    runtime_isolate,    &snapshot_path,    &bundle_path,    &main_module_name,  )  .expect("Failed to create snapshot");}