Programming News Today: TypeScript 7.0 Goes Native, CSS Gap Decorations & React Compiler 1.0 – July 20, 2026

npm install -D typescript@7.0
npx tsc --checkers 8   # parallel type-checking on big repos

.grid {
  display: grid;
  gap: 20px;
  column-rule: 2px solid #ccc;
  row-rule: 1px dashed #999;
}

textarea {
  field-sizing: content;
  max-block-size: 10lh;
}

// next.config.ts
export default { cacheComponents: true };

npm install -D --save-exact babel-plugin-react-compiler@latest

<button commandfor="menu" command="toggle-popover">Menu</button>
<div id="menu" popover>Hello</div>

const blob = new Blob(["hello\nworld"]);
for await (const chunk of blob.textStream()) console.log(chunk);

<div class="scrollbar-thin scrollbar-thumb-sky-700 scrollbar-track-sky-100 overflow-auto">…</div>

<video loading="lazy" controls>
  <source src="clip.mp4" type="video/mp4">
</video>

<div focusgroup="wrap" aria-label="Formatting">
  <button>Bold</button><button>Italic</button>
</div>

<button commandfor="dlg" command="show-modal">Open</button>
<dialog id="dlg"><button commandfor="dlg" command="close">Close</button></dialog>

.grid {
  display: grid;
  gap: 20px;
  column-rule: 2px solid red;
  row-rule: 1px dashed gray;
  row-rule-inset: 10px;
}

textarea { field-sizing: content; }

select:open { border: 1px solid skyblue; }

const cache = new Map();
cache.getOrInsertComputed("user:1", (key) => loadUser(key));

function* a(){ yield 1; yield 2; }
for (const x of Iterator.concat(a(), [3, 4])) console.log(x);

[1, 2, 3, 4, 5].values().includes(3); // true

tsc --checkers 8        # parallel type-checking
tsc --singleThreaded    # deterministic run for debugging

npm install -D typescript@rc && npx tsc --version

{ "compilerOptions": { "strict": true } }

npm install react@19.2.7 react-dom@19.2.7

const onConnected = useEffectEvent(() => showNotification('Connected!', theme));
useEffect(() => {
  const c = createConnection(url, roomId);
  c.connect();
  return () => c.disconnect();
}, [roomId]); // theme is NOT a dependency

npm install -D --save-exact babel-plugin-react-compiler@latest

pnpm dlx shadcn init            # Base UI (default)
pnpm dlx shadcn init -b radix   # Radix

pnpm dlx shadcn@latest init --base aria

pnpm dlx shadcn@latest add message-scroller message bubble

<div class="scrollbar-thin scrollbar-thumb-sky-700 scrollbar-track-sky-100 overflow-auto">…</div>

<div class="zoom-125">Zoomed in 125%</div>

<pre class="tab-2">function indent() { return 'tabbed'; }</pre>

.btn-brand { color: color-contrast(#0d6efd); } // WCAG 2.1 compliant

new bootstrap.Tooltip('#el', { trigger: 'hover click' }); // now correct

<span class="visually-hidden">Screen-reader-only text</span>

const blob = new Blob(["hello\nworld"]);
for await (const chunk of blob.textStream()) console.log(chunk);

nvm install 24.18.0 && node -v   # v24.18.0

node -v   # v22.23.1

// GET /search?filter[color]=red
app.get("/search", (req, res) => res.json(req.query.filter)); // { color: "red" }

app.use((req, res, next) => { console.log(req.socket.remoteAddress); next(); });

// GET /items?a=1&a=2&a=3  ->  ["1","2","3"]
app.get("/items", (req, res) => res.json(req.query.a));

SELECT VERSION();  -- expect 8.4.10 after upgrade

SHOW VARIABLES LIKE 'innodb_log_writer_threads';

SET GLOBAL authentication_ldap_sasl_auth_method_name = 'SCRAM-SHA-256';

// next.config.ts
export default { cacheComponents: true };

export default { cacheComponents: true, partialPrefetching: true };

export default {
  reactCompiler: true,
  experimental: { turbopackFileSystemCacheForBuild: true },
};

SELECT version();  -- 18.4 / 17.10 / 16.14 / 15.18 / 14.23

supabase branches create feat-new-checkout
supabase db push   # apply migrations to the branch

INCREX ratelimit:user42 1 UBOUND 100 EX 60   # atomic windowed rate limit

import { drizzle } from 'drizzle-orm/node-postgres';
const db = drizzle(process.env.DATABASE_URL);
const rows = await db.select().from(users);

db.orders.aggregate([
  { $project: { total: { $convert: { input: "$amount", to: "double" } } } }
]);

import { ref } from 'vue';
const count = ref(0);

const count = signal(0);
const double = computed(() => count() * 2);

greeting = t"Hello {name}"   # PEP 750 t-strings, a Template not a str

void main() {
    IO.println("Hello from JDK 26");
}

int square(int n)
  post(r: r >= 0)   // C++26 contract
{ return n * n; }

import polars as pl
df = pl.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
print(df.select((pl.col("a") + pl.col("b")).alias("sum")))

docker sbx run ubuntu   # new sandbox command in Docker Desktop 4.80