https://github.com/hayd/deno-using

python-style with statements for deno
https://github.com/hayd/deno-using

Last synced: about 1 month ago
JSON representation

python-style with statements for deno

• Host: GitHub
• URL: https://github.com/hayd/deno-using
• Owner: hayd
• Created: 2019-02-18T02:55:02.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2020-05-10T07:10:57.000Z (over 4 years ago)
• Last Synced: 2024-10-19T03:23:24.143Z (about 2 months ago)
• Language: TypeScript
• Homepage:
• Size: 15.6 KB
• Stars: 11
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-deno - deno-using - Python样式语法。 (Uncategorized / Uncategorized)
• awesome-deno-cn - @hayd/deno-using
• awesome-deno - deno-using - An python-style with statements for deno. (Modules / Online Playgrounds)
• awesome-deno - deno-using - An python-style with statements for deno. (Modules / Utils)

README

        
# deno-using

A python-style with statement for deno.

Comes with some `Using` types, e.g. `Open`, `ChDir`, `TempDir`, and `Timeout`.

## Example:

```ts

import { using, Open } from "htps://deno.land/x/using/mod.ts";

const enc = new TextEncoder();

const dec = new TextDecoder();

await using(new Open("file", "w"), async (f: Deno.File) => {

  const data = enc.encode("Hello world!\n");

  await f.write(data);

});

await using(new Open("file", "r"), async (f: Deno.File) => {

  const data = new Uint8Array(20);

  await f.read(data);

  const text = dec.decode(data);

  console.log(text);

});

```

There is also a corresponding sync version `UsingSync`.

## Custom types

You can define your own `Using` types by creating a class which implements `Using`:

```ts

export class Open implements Using {

  constructor(filename: string, mode?: Deno.OpenMode) {

    this.filename = filename;

    this.mode = mode;

  }

  public async _aenter() {

    this.file = await Deno.open(this.filename, this.mode);

    return this.file;

  }

  public async _aexit(e) {

    this.file.close();

  }

  private file: Deno.File;

  private filename: string;

  private mode: Deno.OpenMode;

}

```