[Deno事始め] Denoでコマンドラインから動く対話型アプリケーションを作成する

            $ curl -fsSL https://deno.land/x/install/install.sh | sh
$ deno --version
deno 1.4.6
v8 8.7.220.3
typescript 4.0.3
        

            $ deno run https://deno.land/std/examples/welcome.ts
Download https://deno.land/std/examples/welcome.ts
Warning Implicitly using latest version (0.75.0) for https://deno.land/std/examples/welcome.ts
Download https://deno.land/std@0.75.0/examples/welcome.ts
Check https://deno.land/std@0.75.0/examples/welcome.ts
Welcome to Deno 🦕
        

            $ deno run https://deno.land/std/examples/welcome.ts
Welcome to Deno 🦕
        

            import { readLines } from "https://deno.land/std/io/mod.ts";

async function main() {
    for await (const line of readLines(Deno.stdin)) {
        console.log(">", line);
        if (/quit/.test(line)) {
            console.log("Bye!");
            return true;
        }
    }
}

console.log("Type 'quit' when you want to close the app.");
console.log("Reading line from stdin:");
await main();
        

            $ deno run main.ts
Type 'quit' when you want to close the app.
Reading line from stdin:
hoge #👈hogeを入力
> hoge
fuga #👈fugaを入力
> fuga
piyo #👈piyoを入力
> piyo
quit #👈quitを入力
> quit
Bye!
        

            import Prompt from "https://deno.land/x/prompt/mod.ts";
import PromptError from "https://deno.land/x/prompt/src/errors/PromptError.ts";

const answers = await Prompt.prompts([
    { type: "text", name: "name", message: "Please input your name" },
    {
        type: "text",
        name: "sex",
        message: "Please input your sex(male or female)",
        validate(result: string) {
            if (!["male", "female"].includes(result)) {
                throw new PromptError("input must be [male] or [female]");
            }
        },
    },
    { type: "number", name: "birthYear", min: 1900 },
    { type: "number", name: "age", min: 1, max: 100 },
    { type: "confirm", name: "agree", defaultValue: true },
]);
console.log(answers);
        

            $ deno run main.ts
? Please input your name: Hoge Piyo
? Please input your sex(male or female): male
? BirthYear (>=1900): 1999
? Age (1-100): 21
? Agree (Y/n): true
{ name: "Hoge Piyo", sex: "male", birthYear: 1999, age: 21, agree: true }