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denoland-deno/ext/node/polyfills/02_init.js
Matt Mastracci 08ec6e5831
perf: warm expensive init code at snapshot time (#22714)
Slightly different approach to similar changes in #22386

Note that this doesn't use a warmup script -- we are actually just doing
more work at snapshot time.
2024-03-22 20:49:07 +00:00

72 lines
2.2 KiB
JavaScript

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// deno-lint-ignore-file
import { internals } from "ext:core/mod.js";
const requireImpl = internals.requireImpl;
import { nodeGlobals } from "ext:deno_node/00_globals.js";
import "node:module";
let initialized = false;
function initialize(
usesLocalNodeModulesDir,
argv0,
runningOnMainThread,
workerId,
maybeWorkerMetadata,
warmup = false,
) {
if (!warmup) {
if (initialized) {
throw Error("Node runtime already initialized");
}
initialized = true;
if (usesLocalNodeModulesDir) {
requireImpl.setUsesLocalNodeModulesDir();
}
// FIXME(bartlomieju): not nice to depend on `Deno` namespace here
// but it's the only way to get `args` and `version` and this point.
internals.__bootstrapNodeProcess(argv0, Deno.args, Deno.version);
internals.__initWorkerThreads(
runningOnMainThread,
workerId,
maybeWorkerMetadata,
);
internals.__setupChildProcessIpcChannel();
// `Deno[Deno.internal].requireImpl` will be unreachable after this line.
delete internals.requireImpl;
} else {
// Warm up the process module
internals.__bootstrapNodeProcess(undefined, undefined, undefined, true);
}
}
function loadCjsModule(moduleName, isMain, inspectBrk) {
if (inspectBrk) {
requireImpl.setInspectBrk();
}
requireImpl.Module._load(moduleName, null, { main: isMain });
}
globalThis.nodeBootstrap = initialize;
internals.node = {
initialize,
loadCjsModule,
};
const nativeModuleExports = requireImpl.nativeModuleExports;
nodeGlobals.Buffer = nativeModuleExports["buffer"].Buffer;
nodeGlobals.clearImmediate = nativeModuleExports["timers"].clearImmediate;
nodeGlobals.clearInterval = nativeModuleExports["timers"].clearInterval;
nodeGlobals.clearTimeout = nativeModuleExports["timers"].clearTimeout;
nodeGlobals.console = nativeModuleExports["console"];
nodeGlobals.global = globalThis;
nodeGlobals.process = nativeModuleExports["process"];
nodeGlobals.setImmediate = nativeModuleExports["timers"].setImmediate;
nodeGlobals.setInterval = nativeModuleExports["timers"].setInterval;
nodeGlobals.setTimeout = nativeModuleExports["timers"].setTimeout;
nodeGlobals.performance = nativeModuleExports["perf_hooks"].performance;