index.js

#!/usr/bin/env node
import { mkdirSync, writeFileSync, existsSync } from 'fs';
import { join } from 'path';
import { validate } from '@prestonarnold/validate';
import { Logger } from '@prestonarnold/log';

const logger = new Logger({ prefix: 'new-typescript-package', showTimestamp: false });

const projectNameArg = process.argv[2];
const result = validate.string().min(1).parse(projectNameArg);

if (!result.success) {
  logger.error('Please provide a valid project name.');
  logger.info('Usage: npx new-typescript-package my-library');
  process.exit(1);
}

const projectName = result.data;
const projectDir = join(process.cwd(), projectName);

if (existsSync(projectDir)) {
  logger.error(`Directory "${projectName}" already exists.`);
  process.exit(1);
}
mkdirSync(projectDir);
mkdirSync(join(projectDir, 'src'));

const packageJson = {
  name: projectName,
  version: '0.1.0',
  main: 'dist/index.js',
  types: 'dist/index.d.ts',
  type: 'module',
  scripts: {
    build: 'tsc',
    prepublishOnly: 'npm run build',
    test: 'exit 0'
  },
  files: ["dist", "README.md", "LICENSE"],
  license: 'MIT'
};

const tsconfig = {
  compilerOptions: {
    target: "ES2022",
    module: "NodeNext",
    moduleResolution: "NodeNext",
    outDir: "./dist",
    declaration: true,
    declarationMap: true,
    strict: true,
    verbatimModuleSyntax: true,
  },
  include: ["src/**/*.ts"],
  exclude: ["node_modules", "dist"]
};

writeFileSync(join(projectDir, 'package.json'), JSON.stringify(packageJson, null, 2));
writeFileSync(join(projectDir, 'tsconfig.json'), JSON.stringify(tsconfig, null, 2));
writeFileSync(join(projectDir, '.gitignore'), 'node_modules/\ndist/\n');
writeFileSync(join(projectDir, 'README.md'), '# ' + projectName);
writeFileSync(join(projectDir, 'LICENSE'), 'MIT: todo');
writeFileSync(join(projectDir, '.npmignore'), 'node_modules/\nsrc/\n');
writeFileSync(join(projectDir, 'src/index.ts'), `export const hello = () => console.log('Hello from ${projectName}!');\n`);

logger.info("");
logger.info(`Created TypeScript library in ${projectDir}`);
logger.info("");
logger.info(`Next steps:`);
logger.info(` cd ${projectName}`);
logger.info(` npm install --save-dev typescript`);
logger.info(` npm run build`);
logger.info("");
logger.info(`Happy hacking!`);