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https://github.com/justjavac/node2deno
Deno for Node.js developers
https://github.com/justjavac/node2deno
deno nodejs
Last synced: 3 months ago
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Deno for Node.js developers
- Host: GitHub
- URL: https://github.com/justjavac/node2deno
- Owner: justjavac
- License: mit
- Created: 2021-05-21T02:10:57.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2021-05-26T08:30:28.000Z (over 3 years ago)
- Last Synced: 2024-10-04T13:32:15.944Z (4 months ago)
- Topics: deno, nodejs
- Homepage:
- Size: 41 KB
- Stars: 18
- Watchers: 4
- Forks: 5
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# From Node.js to Deno
Deno for Node.js developers.
## Console
### Class `Console`
```ts
// Node
const { Console } = console;
new Console({ stdout: process.stdout, stderr: process.stderror });
// Deno
const { Console } = console;
// undefined
// Chrome
const { Console } = console;
// undefined
```
### `console.error`
```ts
// Node
console.error(new Error("Whoops, something bad happened"));
// Error: Whoops, something bad happened
// at REPL1:1:15
// at Script.runInThisContext (vm.js:133:18)
// at REPLServer.defaultEval (repl.js:484:29)
// at bound (domain.js:413:15)
// at REPLServer.runBound [as eval] (domain.js:424:12)
// at REPLServer.onLine (repl.js:817:10)
// at REPLServer.emit (events.js:327:22)
// at REPLServer.EventEmitter.emit (domain.js:467:12)
// at REPLServer.Interface._onLine (readline.js:337:10)
// at REPLServer.Interface._line (readline.js:666:8)
// Deno
console.error(new Error("Whoops, something bad happened"));
// Error: Whoops, something bad happened
// at :2:15
// Chrome
console.error(new Error("Whoops, something bad happened"));
// Error: Whoops, something bad happened
// at :1:15
```
### `console.trace`
```ts
// Node
console.trace("Show me");
// Trace: Show me
// at REPL14:1:9
// at Script.runInThisContext (vm.js:133:18)
// at REPLServer.defaultEval (repl.js:484:29)
// at bound (domain.js:413:15)
// at REPLServer.runBound [as eval] (domain.js:424:12)
// at REPLServer.onLine (repl.js:817:10)
// at REPLServer.emit (events.js:327:22)
// at REPLServer.EventEmitter.emit (domain.js:467:12)
// at REPLServer.Interface._onLine (readline.js:337:10)
// at REPLServer.Interface._line (readline.js:666:8)
// Deno
console.trace("Show me");
// Trace: Show me
// at :2:9
// Chrome
console.trace("Show me");
// Show me
// (anonymous) @ VM45:1
```
## File system
### Reading file
```ts
// Node
import fs from "fs/promises";
const data = await fs.readFile("./README.md", "utf8");
// Deno
// Requires `--allow-read` permission
const data = await Deno.readTextFile("./README.md");
```
### Writing file
```ts
// Node
import fs from "fs/promises";
const content = "Some content!";
await fs.writeFile("./file.txt", content);
// Deno
// Requires `--allow-write` permission
const content = "Some content!";
await Deno.writeTextFile("./file.txt", content);
```
### File descriptors
```ts
// Node
import fs from "fs/promises";
const file = await fs.open("./file.txt");
// Deno
// Requires `allow-read` and/or `allow-write` permissions depending on options.
const file = await Deno.open("./file.txt");
```
### Copying file
```ts
// Node
import fs from "fs/promises";
await fs.copyFile('source.txt', 'target.txt');
// Deno
// Requires `allow-read` and/or `allow-write` permissions depending on options.
import { copy } from "https://deno.land/[email protected]/fs/mod.ts";
await copy('./source.txt', './target.txt');
```
### Moveing file
```ts
// Node
import fs from "fs/promises";
await fs.rename('source.txt', 'target.txt');
// Deno
// Requires `allow-read` and/or `allow-write` permissions depending on options.
import { move } from "https://deno.land/[email protected]/fs/mod.ts";
await move('./source.txt', './target.txt');
```
## Path
### Last portion of a path
```ts
// Node
import path from "path";
path.basename("/foo/bar/baz/asdf/quux.html");
// -> 'quux.html'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.basename("/foo/bar/baz/asdf/quux.html");
// -> 'quux.html'
```
Or with file extensions:
```ts
// Node
import path from "path";
path.basename("/foo/bar/baz/asdf/quux.html", ".html");
// -> 'quux'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.basename("/foo/bar/baz/asdf/quux.html", ".html");
// -> 'quux'
```
### Directory name of a path
```ts
// Node
import path from "path";
path.dirname("/foo/bar/baz/asdf/quux");
// -> '/foo/bar/baz/asdf'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.dirname("/foo/bar/baz/asdf/quux");
// -> '/foo/bar/baz/asdf'
```
### Extension of the path
```ts
// Node
import path from "path";
path.extname("index.html");
// -> '.html'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.extname("index.html");
// -> '.html'
```
### Join all path segments together
```ts
// Node
import path from "path";
path.join("/foo", "bar", "baz/asdf", "quux", "..");
// -> '/foo/bar/baz/asdf'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.join("/foo", "bar", "baz/asdf", "quux", "..");
// -> '/foo/bar/baz/asdf'
```
### Resolves path segments into an absolute path.
```ts
// Node
import path from "path";
path.resolve('/foo/bar', './baz');
// -> '/foo/bar/baz'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.resolve('/foo/bar', './baz');
// -> '/foo/bar/baz'
```
### Normalizes a path
```ts
// Node
import path from "path";
path.normalize("/foo/bar//baz/asdf/quux/..");
// -> '/foo/bar/baz/asdf'
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.normalize("/foo/bar//baz/asdf/quux/..");
// -> '/foo/bar/baz/asdf'
```
### Parse a path
```ts
// Node
import path from "path";
path.parse("/home/user/dir/file.txt");
// -> { root: "/", dir: "/home/user/dir", base: "file.txt", ext: ".txt", name: "file" }
// Deno
import * as path from "https://deno.land/std/path/mod.ts";
path.parse("/home/user/dir/file.txt");
// -> { root: "/", dir: "/home/user/dir", base: "file.txt", ext: ".txt", name: "file" }
```
## Subprocess
TODO: needs improvement
### Subprocess in a short story
```ts
// Node
// All functionalities associated to subprocess are under `child_process` module
const child_process = require("child_process");
// Spawn a subprocess
const p = child_process.spawn("ping", ["-h"]);
// OR buffered version `child_process.exec`
// OR synced version `child_process.spawnSync`
// redirect stdout
p.stdout.on("data", (data) => console.log(data));
// redirect stderr
p.stderr.on("data", (error) => console.log(error));
// Subprocess Close event
p.on("close", (code) => console.log(`child process exited with code ${code}`));
// Here's how we can spawn a *BRAND NEW* nodejs instance to run a js "module"
child_process.fork("hello.js");
// Final output:
//
// child process exited with code 1
// hello from hello.js
// Deno
// Deno uses `Deno.run` to spawn a subprocess
// `allow-run` permission *REQUIRED*
const p = Deno.run({
cmd: ["ping", "-h"],
stdout: "piped",
stderr: "piped",
});
// HERE, we read out the stdout output that we set to piped before
console.log(await p.output());
// and of course the stderr
console.log(await p.stderrOutput());
// In Deno, we don't have a fork like function,
// instead you can still use `Deno.run` to spawn
// a `BRAND NEW` Deno instance to run the script
const decoder = new TextDecoder();
const forkLike = Deno.run({
cmd: ["deno", "run", "hello.js"],
stdout: "piped",
});
console.log(decoder.decode(await forkLike.output())); // hello from hello.js
// OR in a IMO better way: `Web workers`
new Worker(
new URL("./hello.js", import.meta.url).href,
{ type: "module" },
); // hello from hello.js
// Final output:
// Uint8Array(1497) [
// 209, 161, 207, 238, 32, 45, 104, 32, 178, 187, 213, 253, 200, 183, 161,
// 163, 13, 10, 13, 10, 211, 195, 183, 168, 58, 32, 112, 105, 110, 103,
// 32, 91, 45, 116, 93, 32, 91, 45, 97, 93, 32, 91, 45, 110, 32,
// 99, 111, 117, 110, 116, 93, 32, 91, 45, 108, 32, 115, 105, 122, 101,
// 93, 32, 91, 45, 102, 93, 32, 91, 45, 105, 32, 84, 84, 76, 93,
// 32, 91, 45, 118, 32, 84, 79, 83, 93, 13, 10, 32, 32, 32, 32,
// 32, 32, 32, 32, 32, 32, 32, 32, 91, 45,
// ... 1397 more items
// ]
// Uint8Array(0) []
// hello from hello.js
// hello from hello.js
```