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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
mod errors;
mod esm_resolver;
use deno_core::error::AnyError;
use deno_core::located_script_name;
use deno_core::url::Url;
use deno_core::JsRuntime;
use once_cell::sync::Lazy;
pub use esm_resolver::check_if_should_use_esm_loader;
pub(crate) use esm_resolver::NodeEsmResolver;
// TODO(bartlomieju): this needs to be bumped manually for
// each release, a better mechanism is preferable, but it's a quick and dirty
// solution to avoid printing `X-Deno-Warning` headers when the compat layer is
// downloaded
static STD_URL_STR: &str = "https://deno.land/std@0.120.0/";
static SUPPORTED_MODULES: &[&str] = &[
"assert",
"assert/strict",
"async_hooks",
"buffer",
"child_process",
"cluster",
"console",
"constants",
"crypto",
"dgram",
"dns",
"domain",
"events",
"fs",
"fs/promises",
"http",
"https",
"module",
"net",
"os",
"path",
"path/posix",
"path/win32",
"perf_hooks",
"process",
"querystring",
"readline",
"stream",
"stream/promises",
"stream/web",
"string_decoder",
"sys",
"timers",
"timers/promises",
"tls",
"tty",
"url",
"util",
"util/types",
"v8",
"vm",
"zlib",
];
static NODE_COMPAT_URL: Lazy<String> = Lazy::new(|| {
std::env::var("DENO_NODE_COMPAT_URL")
.map(String::into)
.ok()
.unwrap_or_else(|| STD_URL_STR.to_string())
});
static GLOBAL_URL_STR: Lazy<String> =
Lazy::new(|| format!("{}node/global.ts", NODE_COMPAT_URL.as_str()));
pub(crate) static GLOBAL_URL: Lazy<Url> =
Lazy::new(|| Url::parse(&GLOBAL_URL_STR).unwrap());
static MODULE_URL_STR: Lazy<String> =
Lazy::new(|| format!("{}node/module.ts", NODE_COMPAT_URL.as_str()));
pub(crate) static MODULE_URL: Lazy<Url> =
Lazy::new(|| Url::parse(&MODULE_URL_STR).unwrap());
static COMPAT_IMPORT_URL: Lazy<Url> =
Lazy::new(|| Url::parse("flags:compat").unwrap());
/// Provide imports into a module graph when the compat flag is true.
pub(crate) fn get_node_imports() -> Vec<(Url, Vec<String>)> {
vec![(COMPAT_IMPORT_URL.clone(), vec![GLOBAL_URL_STR.clone()])]
}
fn try_resolve_builtin_module(specifier: &str) -> Option<Url> {
if SUPPORTED_MODULES.contains(&specifier) {
let module_url =
format!("{}node/{}.ts", NODE_COMPAT_URL.as_str(), specifier);
Some(Url::parse(&module_url).unwrap())
} else {
None
}
}
pub(crate) fn load_cjs_module(
js_runtime: &mut JsRuntime,
module: &str,
main: bool,
) -> Result<(), AnyError> {
let source_code = &format!(
r#"(async function loadCjsModule(module) {{
const Module = await import("{module_loader}");
Module.default._load(module, null, {main});
}})('{module}');"#,
module_loader = MODULE_URL_STR.as_str(),
main = main,
module = escape_for_single_quote_string(module),
);
js_runtime.execute_script(&located_script_name!(), source_code)?;
Ok(())
}
pub(crate) fn add_global_require(
js_runtime: &mut JsRuntime,
main_module: &str,
) -> Result<(), AnyError> {
let source_code = &format!(
r#"(async function setupGlobalRequire(main) {{
const Module = await import("{}");
const require = Module.createRequire(main);
globalThis.require = require;
}})('{}');"#,
MODULE_URL_STR.as_str(),
escape_for_single_quote_string(main_module),
);
js_runtime.execute_script(&located_script_name!(), source_code)?;
Ok(())
}
fn escape_for_single_quote_string(text: &str) -> String {
text.replace(r"\", r"\\").replace("'", r"\'")
}
pub fn setup_builtin_modules(
js_runtime: &mut JsRuntime,
) -> Result<(), AnyError> {
let mut script = String::new();
for module in SUPPORTED_MODULES {
// skipping the modules that contains '/' as they are not available in NodeJS repl as well
if !module.contains('/') {
script = format!("{}const {} = require('{}');\n", script, module, module);
}
}
js_runtime.execute_script("setup_node_builtins.js", &script)?;
Ok(())
}
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