@kokamvd/esbuild-envfile-plugin/package/test/build.js

esbuild plugin to load a .env file from the current directory or any parent. It will combine the environment variables with existing/system-wide process.env variables.

//const envFilePlugin = require('esbuild-envfile-plugin');
const envFilePlugin = require('../index.js'); // use for "live" testing :)
const dotenv = require('dotenv');
const path = require('path');
const { getNormalizedEnvDefines } = require('./utils');

// Config: relative to where npm command is run:
const APP_BASE = './src';
const ENTRY_FILE = 'index.js';
const OUTPUT_DIR = 'build';
const OUTPUT_FILE = 'app.js';
const TARGET = 'es2020';

// try to use dotenv to load in custom local env vars to existing node runtime env vars:
const envFile = process.env.NODE_ENV
  ? `.env.${process.env.NODE_ENV}`
  : '.env.local';
dotenv.config({ path: envFile });

// collect all new env vars wrapped in quotes for passage to build define
const { define } = getNormalizedEnvDefines();

function build(entryFile, outFile) {
  console.log('build() ', entryFile, '=>', outFile);
  require('esbuild')
    .build({
      entryPoints: [path.resolve(entryFile)],
      outfile: path.resolve(outFile),
      platform: 'node',
      bundle: true,
      target: TARGET,
      logLevel: 'silent',
      plugins: [
        envFilePlugin({
          includeSystemProcessEnv: false,
          filterByPrefix: null,
        }),
      ],
      define,
    })
    .then((r) => {
      console.log('Build succeeded.');
    })
    .catch((e) => {
      console.log('Error building:', e.message);
      process.exit(1);
    });
}

build(`${APP_BASE}/${ENTRY_FILE}`, `${OUTPUT_DIR}/${OUTPUT_FILE}`);