David Sherret
@dsherret.dev
1.5K followers 80 following 153 posts
Software developer. Prev @deno.land. Working on ts-morph, dprint, and more (github.com/dsherret)
Software developer. Prev @deno.land. Working on ts-morph, dprint, and more (github.com/dsherret)
![```ts
export type Uint8Array_ = ReturnType<Uint8Array["slice"]>;
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:aru7qazvs3d5fao6fmbjt2so/bafkreia7ac5r5hy6rwdnghdlz2lpycsoisnamejleuv5fk2thz37lp6we4)
![buffer property on Uint8Array going to ArrayBufferLike in TS 5.6
```ts
type IsAny<T> = 0 extends (1 & T) ? true : false;
// @ts-ignore uint8array is not generic in TS < 5.7
type NewUint8Array<T> = Uint8Array<T>;
type IsOld = IsAny<NewUint8Array<ArrayBuffer>>;
type Uint8Array2<T> =
IsOld extends true
? Uint8Array
: NewUint8Array<T>;
function test(): Uint8Array2<ArrayBuffer> {
return new Uint8Array([]);
}
const buffer = test().buffer;
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:aru7qazvs3d5fao6fmbjt2so/bafkreifdon66tumbatmkczifjix6imencbv34l2fc2cmel3rucprf6zqbu)
![Code:
```
import { ts as ts1 } from "./typescript1.js";
import { ts as ts2 } from "./typescript2.js";
for (let i = 1; i <= 3; i++) {
setTimeout(() => {
console.log(`${(process.memoryUsage().rss / 1024 ** 2).toFixed(2)} MB`);
if (i === 3) {
console.log(getVersions().join(", "));
}
}, i * 20_000);
}
function getVersions() {
const versions = [];
if (process.versions.deno) {
versions.push(`Deno ${process.versions.deno}`); // upcoming 2.0.3
}
if (process.versions.bun) {
versions.push(`Bun ${process.versions.bun}`); // 1.1.33
}
versions.push(`Typescript ${ts1.version}`); // 5.5.2
versions.push(`Typescript ${ts2.version}`); // 5.6.2
return versions;
}
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:aru7qazvs3d5fao6fmbjt2so/bafkreibjw5kghqh3png6ni7npkq37iimisf5j2nxbs35xa3hk2fua77o74)
![Shows Deno using 69.75 MB after 60s and Bun using 160.29 MB
```shellsession
V:\scratch
> deno compile --quiet --allow-env main.js
V:\scratch
> ./scratch
71.47 MB
69.74 MB
69.75 MB
Deno 2.0.2+e162306, Typescript 5.5.2, Typescript 5.6.2
V:\scratch
> bun build main.js --outfile scratch_bun --compile
[284ms] bundle 3 modules
[39ms] compile scratch_bun.exe
V:\scratch
> ./scratch_bun
192.89 MB
160.29 MB
160.29 MB
Bun 1.1.33, Typescript 5.5.2, Typescript 5.6.2
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:aru7qazvs3d5fao6fmbjt2so/bafkreicqtun7qs6hewfrne6xgjxonjssrqlsa2bhmwqp23oijpeq6maefe)
![Rust code:
use jsonc_parser::cst::CstRootNode;
use jsonc_parser::cst::CstInputValue;
use jsonc_parser::errors::ParseError;
use jsonc_parser::json;
/// Add a plugin url to the dprint config file's plugins array.
///
/// ```jsonc
/// {
/// "plugins": [
/// "https://plugins.dprint.dev/toml-0.6.3.wasm",
/// "<new url goes here>"
/// ]
/// }
/// ```
pub fn add_to_plugins_array(
file_text: &str,
url: &str,
) -> Result<String, ParseError> {
let root_node = CstRootNode::parse(file_text, &Default::default())?;
let root_obj = root_node.object_value_or_set();
let plugins = root_obj.array_value_or_set("plugins");
plugins.ensure_multiline();
plugins.append(json!(url));
Ok(root_node.to_string())
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:aru7qazvs3d5fao6fmbjt2so/bafkreif6hwdxjcutwhntklzfiha5ki6g2wkcw7sclsw22jhd4qmxogjbzi)
![```ts
// @ts-ignore typed arrays are not generic in TS < 5.7
type NewUint8Array<T> = Uint8Array<T>;
interface Child {
__test_property__: string;
}
interface Parent extends Uint8Array, Child {
}
// Uint8Array#reverse() started returning `this` in TS 5.7
type IsNew = ReturnType<Parent["reverse"]> extends Child ? true : false;
type LocalUint8Array<T> = IsNew extends true ? NewUint8Array<T> : Uint8Array;
export type { LocalUint8Array as Uint8Array };
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:aru7qazvs3d5fao6fmbjt2so/bafkreifz6hs7qpyivyrp6uxjjbi6mibngwg2gc5hdajwaanecxmnzacts4)
