with-ssm/src/start.ts

import yargs from 'yargs/yargs';
import { hideBin } from 'yargs/helpers';

import { exec } from './utils/exec.js';
import { getEnv } from './utils/env.js';
import { replaceParams } from './utils/ssm.js';

const argv = await yargs(hideBin(process.argv))
  .usage('Usage: $0 [options] -- <command>')
  .option('region', {
    type: 'string',
    description: 'The AWS region to use for SSM.',
  })
  .option('profile', {
    type: 'string',
    description: 'The AWS profile to use from your credentials file.',
  })
  .option('file', {
    alias: 'f',
    type: 'string',
    description: 'The file to use for environment variables. (multiple files can be specified)',
    default: ['.env.with-ssm', '.env'],
  })
  .demandCommand(1, 'Error: You must provide a command to execute after --')
  .alias('h', 'help')
  .epilogue('For more information, check the documentation.')
  .parse();

const command = argv._[0] as string;
const commandArgs = argv._.slice(1).map(String);

if (!command) {
  console.error('No command provided');
  process.exit(1);
}

const files = argv.file && Array.isArray(argv.file) ? argv.file : [argv.file];
const hostEnv = await getEnv(files);
const env = await replaceParams(hostEnv, {
  region: argv.region,
  profile: argv.profile,
});

exec({
  command,
  env,
  args: commandArgs,
});