@baseline-types/dom-newly-available - DOM types for Baseline Newly available

This package contains the DOM types for the web APIs that are currently Baseline Newly available. Unlike the per-year @baseline-types/dom-<year> packages, it is not frozen to a fixed year — it tracks the latest Baseline state and moves forward as more APIs reach Newly available. It is a drop-in replacement for @types/web / the built-in dom library that lets you pin your project to the newly available web platform surface instead of always tracking the latest specs.

The types are generated from the same spec data (@webref/idl + @mdn/browser-compat-data) as @types/web, then cut down with compute-baseline to the Baseline Newly available set. The cut is referentially closed, so the output is a valid superset of the strict "Baseline Newly available" set (an API that depends on a type which is not yet newly available keeps that type).

Installation

With TypeScript 4.5+ using lib replacement, swap the built-in DOM lib for this package:

npm install @typescript/lib-dom@npm:@baseline-types/dom-newly-available --save-dev
pnpm add @typescript/lib-dom@npm:@baseline-types/dom-newly-available --save-dev
yarn add @typescript/lib-dom@npm:@baseline-types/dom-newly-available --dev

If you are using TypeScript 6.0+, set libReplacement to true in your tsconfig.json.

That's all — your project now sees only the DOM APIs that are Baseline Newly available.

1. Install the dependency: npm install @baseline-types/dom-newly-available --save-dev.

2. Update your tsconfig.json. There are two cases depending on whether you have lib defined.

   1. Without "lib" - Add "lib": [] plus the entry matching your "target" (e.g. "lib": ["es2017"] for "target": "es2017").
   2. With "lib" - Remove "dom".

Removing "dom" lets this package provide the global declarations instead.

What "Baseline Newly available" means here

• An API is included if its Baseline status is Newly available as of the underlying browser-compat-data snapshot. "Newly available" means every core browser has shipped it (baseline_low_date); "Widely available" additionally means ~30 months have passed since then (baseline_high_date).
• The cut moves over time: each data refresh can promote more APIs into this set (and, for the newly-available cut, some of those APIs later also appear in the widely-available cut).
• A few references that can't be satisfied in a given scope (e.g. an enum whose only interface was cut) are degraded to any.
• When unsure whether an API has Baseline data at all (e.g. WebAssembly), it is kept rather than dropped.

SemVer

This project does not respect semantic versioning — the underlying spec data and Baseline computation change over time, and any update could add or remove types. The Baseline state in the package name is the stable axis. The version's patch component is the release date (1.0.YYYYMMDD, e.g. 1.0.20260707), so the version simply records the day each data refresh was cut.

Deploy Metadata

You can read what changed in version 1.0.20260919 at https://github.com/uhyo/TypeScript-Baseline-Types/releases/tag/%40baseline-types%2Fdom-newly-available%401.0.20260919.