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Online Typescript Read-Eval-Print Loop (REPL)

https://www.typescriptlang.org/play

Deno has Typescript as first class citizen, compared to Node.js, it supports some common environment variable (such as HTTPS_PROXY) and other nice environment variable (e.g. DENO_AUTH_TOKENS DENO_CERT DENO_TLS_CA_STORE NPM_CONFIG_REGISTRY) out of the box. So you can inject these variable before running Deno.

Linux installation

>>> curl --fail --location --show-error --silent https://deno.land/x/install/install.sh | sh
######################################################################## 100.0%
Archive:  /home/admin/.deno/bin/deno.zip
  inflating: /home/admin/.deno/bin/deno
.
Stuck? Join our Discord https://discord.gg/deno

macOS installation

>>> brew install deno
==> Fetching deno
.
>>> deno eval 'console.log(Deno.env.get("SHELL"))'
/usr/local/bin/bash
>>> deno run --allow-net bot.ts
┌ ⚠️  Deno requests env access to "BOT_TKN".
├ Run again with --allow-env to bypass this prompt.
└ Allow? [y/n/A] (y = yes, allow; n = no, deny; A = allow all env permissions) >
❌ Denied env access to "BOT_TKN".
error: Uncaught PermissionDenied: Requires env access to "BOT_TKN", run again with the --allow-env flag
const bot = new Bot(Deno.env.get("BOT_TKN")); // <-- put your bot token between the ""

>>> deno run --allow-env --allow-net bot.ts
grammy:bot Initializing bot +0ms
.
grammy:core Calling getUpdates +30s

Deno user cache on macOS: ~/Library/Caches/deno Several SQLite database under ~/Library/Caches/deno

Use Typescript with Node.js

>>> npm --global install @typescript-eslint/parser @typescript-eslint/eslint-plugin eslint typescript
.
added 183 packages in 12s

Compile a typescript source code file to javascript

>>> tsc example.ts

REPL without a browser

https://github.com/HerringtonDarkholme/typescript-repl

https://github.com/TypeStrong/ts-node

Reference

The TypeScript Handbook https://www.typescriptlang.org/docs/handbook/intro.html

https://www.typescriptlang.org/tsconfig

tsconfig.json schema http://json.schemastore.org/tsconfig

https://en.wikipedia.org/wiki/ECMAScript_version_history