New TypeScript Boilerplate Generator

new-ts.js

// Author: Daniel Abeles
// Github: https://github.com/Den1al

const fs = require('fs');
const { exec } = require("child_process");

function normalizeSpaces(text) {
    let numOfSpaces = text.split(/\n/)
        .filter(Boolean)[0]
        .search(/\S/);

    return text.split(/\n/)
        .map(line => line.substr(numOfSpaces, line.length))
        .join('\n')
}

async function runInit() {
    return new Promise((resolve, reject) => {
        exec("npm init -y", err => {
            if (err) reject(err)
            else resolve(true);
        })
    })
}

async function modifyPackageJSON() {
    const JSON_PATH = 'package.json';

    async function getJSON() {
        return new Promise((resolve, reject) => {
            fs.readFile(JSON_PATH, {
                encoding: 'utf-8'
            }, (err, data) => {
                if (err) reject(err)
                else resolve(JSON.parse(data))
            })
        })
    }

    async function writeJSON(json) {
        return new Promise((resolve, reject) => {
            fs.writeFile(JSON_PATH, JSON.stringify(json, null, 4), 'utf-8', err => {
                if (err) reject(err)
                else resolve(true);
            })
        })
    }

    let json = await getJSON();
    json['author'] = 'Daniel Abeles (https://github.com/Den1al)';
    json['scripts'] = {
        'start': 'ts-node src/index.ts'
    };

    await writeJSON(json);
}

async function createSrcDir() {
    return new Promise((resolve, reject) => {
        fs.mkdir('src', err => {
            if (err) reject(err)
            else resolve(true)
        })
    });
}

async function createIndexFile() {
    return new Promise((resolve, reject) => {
        const content = `
        async function main() {
            console.log("hello world!");
        }

        main();
        `;

        fs.writeFile('src/index.ts', normalizeSpaces(content), 'utf-8', err => {
            if (err) reject(err)
            else resolve(true)
        })
    })
}

async function createTypeScriptConfig() {
    return new Promise((resolve, reject) => {
        const content = `
        {
            "compilerOptions": {
                "module": "commonjs",
                "lib": [
                    "DOM",
                    "ES2020"
                ],
                "target": "ES2020"
            },
            "exclude": [
                "node_modules"
            ]
        }
        `;

        fs.writeFile('tsconfig.json', normalizeSpaces(content), 'utf-8', err => {
            if (err) reject(err)
            else resolve(true)
        })
    })
}


async function main() {
    await createSrcDir();
    await createIndexFile();
    await createTypeScriptConfig();
    await runInit();
    await modifyPackageJSON();
}

main();