Formatter for JS & TS; `ShadowRealm` – a better `eval()`; shim for Import Maps; ESLint rules for async code

ES.nextNews: the latest in JavaScript and cross-platform tools
Curated by Dr. Axel Rauschmayer and Johannes Weber.

ES.next News

The latest in JavaScript and cross-platform tools

Rome Formatter, a new formatter for JavaScript and TypeScript
rome.tools @rometools

Rome Formatter mimics Prettier’s styling as much as possible.
Existing code formatters are not robust w.r.t. syntax errors: a single error can hold up formatting for the rest of the code. In contrast, Rome Formatter works well with incorrect code.
Implemented in Rust and 9–12 times faster than Prettier in their tests.
Future: Rome Formatter will be expanded to support more web languages such as CSS, HTML, and JSON.

ShadowRealms – an ECMAScript proposal for a better eval()
2ality.com @2ality

Class ShadowRealm provides a new way of evaluating code at runtime – think eval() but better:

Each instance has its own global JavaScript scope.
Code is evaluated in that scope. If it changes global data, that only affects the ShadowRealm, but not the real global data.

How ES Module Shims became a production Import Maps polyfill
guybedford.com @guybedford

Import Maps are now supported by 70% of users and Firefox just announced they are starting to implement them. For browsers that don’t support Import Maps, we can use ES Module Shims, a production-suitable polyfill. This post provides deeper insight into this polyfill:

The project’s architecture
How the polyfill mode came about
Performance benchmarks
Ideas for the future of the project

14 ESLint rules to help you write asynchronous code in JavaScript
maximorlov.com @_maximization

Explains how the following ESLint rules can help with asynchronous code:

no-async-promise-executor
no-await-in-loop
no-promise-executor-return
require-atomic-updates
max-nested-callbacks
no-return-await
prefer-promise-reject-errors
node/handle-callback-err
node/no-callback-literal
node/no-sync
@typescript-eslint/await-thenable
@typescript-eslint/no-floating-promises
@typescript-eslint/no-misused-promises
@typescript-eslint/promise-function-async

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rt syntax errors production Import Maps polyfill crossplatform tools Rome Formatter Dr Axel Rauschmayer ES Module Shims real global data Existing code formatters global JavaScript scope

TC39 meeting in March; new Node.js features; Locale-aware sorting; built-in test runner for Node.js; supply chain security

Tuesday, April 5, 2022

ES.nextNews: the latest in JavaScript and cross-platform tools Curated by Dr. Axel Rauschmayer and Johannes Weber. ES.next News The latest in JavaScript and cross-platform tools Updates from TC39

Formatter for JS & TS; `ShadowRealm` – a better `eval()`; shim for Import Maps; ESLint rules for async code

The latest in JavaScript and cross-platform tools

Key phrases

Older messages

TC39 meeting in March; new Node.js features; Locale-aware sorting; built-in test runner for Node.js; supply chain security

Searching Arrays backwards; importing JSON; AbortSignal.timeout(); parceljs; MDN Plus

Type annotations; WebGPU; npm package `-`; console-based debugging; name clashes with proposed features

MDN redesign; ShadowRealms; properties of primitives; controling Promise concurrency; detecting malicious npm packages

Publishing Deno modules to npm

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