Prettier 2.7; Deno 1.23; web streams; block statements; statically transform module specifiers

• This release includes a new --cache CLI option. Enabling this option will use some attributes as cache keys and format files only if they have changed. This could dramatically improve CLI performance.
• We’ve also added support for formatting TypeScript 4.7 syntax!

• No type-checking by default in deno run, deno eval, and deno cache
• File watcher watches dynamic imports
• Updates to deno task
• Updates to deno fmt
• deno info supports --config and --no-config flags
• REPL: Use Ctrl-S to insert newlines into your input
• SIGINT and SIGBREAK signal listening support on Windows
• Support for "deflate-raw" in CompressionStream and DecompressionStream
• TypeScript 4.7
• Changes to flags standard module (which parses command line arguments)
• Changes to assertThrows and assertRejects

The blog post is a tutorial for using web streams with many code examples. It focuses on Node.js but most of the content also applies to other platforms.

function test() {
  const type = 'some';
  {
    const thing = getThing(type, 1);
    assert.equal(thing, 1);
  }
  {
    const thing = getThing(type, 2);
    assert.equal(thing, 2);
  }
}

// Before
import {html, css, LitElement} from "lit";
// After
import {html, css, LitElement} from "https://cdn.jsdelivr.net/gh/lit/dist@2/core/lit-core.min.js";