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Modules. Modules everywhere.

Jan Olaf Krems jkrems

Modules. Modules everywhere.
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View nested-loader-order.txt
import "fs";
'fs' -> 'node:fs'
'fs' -> $BWRAP = 'data:import "node:fs";'
'fs' -> $AWRAP = 'data:import "$BWRAP";'
View error.txt
> make -j4
/Applications/ -C out BUILDTYPE=Release V=0
LD_LIBRARY_PATH=/Users/jkrems/Projects/node/node/out/Release/$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../.; mkdir -p /Users/jkrems/Projects/node/node/out/Release/obj/gen; python tools/ lib/internal/bootstrap/environment.js lib/internal/bootstrap/loaders.js lib/internal/bootstrap/node.js lib/internal/bootstrap/pre_execution.js lib/internal/per_context/primordials.js lib/internal/per_context/setup.js lib/internal/per_context/domexception.js lib/async_hooks.js lib/assert.js lib/buffer.js lib/child_process.js lib/console.js lib/constants.js lib/crypto.js lib/cluster.js lib/dgram.js lib/dns.js lib/domain.js lib/events.js lib/fs.js lib/http.js lib/http2.js lib/_http_agent.js lib/_http_client.js lib/_http_common.js lib/_http_incoming.js lib/_http_outgoing.js lib/_http_server.js lib/https.js lib/inspector.js lib/module.js lib/net.js lib/os.j
jkrems / index-original.js
Last active Nov 17, 2018
TypeScript as a Linter
View index-original.js
'use strict';
function calculate(expression) {
// [...]
jkrems /
Last active Nov 6, 2018
Module Resolution & Format Lookup

Module Resolution & Format Lookup

Motivating Examples

  • A package (react-dom) has a dedicated entrypoint `react-dom/server for code that isn't compatible with a browser environment.
  • A package (angular) exposes multiple independent APIs, modeled via import paths like angular/common/http.
  • A package (lodash) allows to import individual functions, e.g. lodash/map.
  • A package is exclusively exposing an ESM interface.
  • A package is exclusively exposing a CJS interface.
  • A package is exposing both an ESM and a CJS interface.
jkrems /
Last active Jun 27, 2018
require('async') → async/await

Moving to async/await


function before(cb) {
jkrems / background-json-parse.js
Created Mar 6, 2018
JSON.parse w/o blocking main thread
View background-json-parse.js
'use strict';
const ivm = require('isolated-vm');
function handleParseJob(code) {
return new ivm.ExternalCopy(JSON.parse(code), { transferOut: true });
function transferInExternalCopy(copy) {
return copy.copy({ transferIn: true });
jkrems /
Last active Oct 7, 2019
History of ES modules
jkrems / .gitignore
Last active Dec 9, 2017
View .gitignore
View v8-coverage.js
// V8 6.2 required
'use strict';
const fs = require('fs');
const { Session } = require('inspector');
const { promisify } = require('util');
const session = new Session();
if (session != null) {

Getting seconds or milliseconds since January 1, 1970, 00:00:00 GMT in various languages


C (1972)

// ms
struct timespec spec;
clock_gettime(CLOCK_REALTIME, &spec);
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