build.js

'use strict';

const glob = require('fast-glob');
const { promisify } = require('util');
const { build } = require('esbuild');
const fs = require('fs');
const copyFiles = promisify(require('copyfiles'));
const path = require('path');
const exec = promisify(require('child_process').exec);

const stat = promisify(fs.stat);
const copyFile = promisify(fs.copyFile);

// if this script is moved, this will need to be adjusted
const rootDir = __dirname;
const outdir = path.join(rootDir, 'dist');

const nodeMajorVersion = Number(process.version.match(/(?<=^v)\d+/));

async function rmDistDir() {
  try {
    await stat(outdir);
    if (nodeMajorVersion >= 14) {
      const rm = promisify(fs.rm);
      await rm(outdir, { recursive: true });
    } else {
      const rmdir = promisify(fs.rmdir);
      await (nodeMajorVersion >= 12 ? rmdir(outdir, { recursive: true }) : rmdir(outdir));
    }
  } catch {
    /* no-op */
  }
}

async function main() {
  console.info('Compiling sequelize...');
  const [declarationFiles, filesToCompile] = await Promise.all([
    // Find all .d.ts files from types/
    glob('./types/**/*.d.ts', { onlyFiles: true, absolute: false }),
    // Find all .js and .ts files from lib/
    glob('./lib/**/*.[tj]s', { onlyFiles: true, absolute: false }),
    // Delete dist/ for a full rebuild.
    rmDistDir(),
  ]);

  // copy .d.ts files prior to generating them from the .ts files
  // so the .ts files in lib/ will take priority..
  await copyFiles(
    // The last path in the list is the output directory
    [...declarationFiles, outdir],
    { up: 1 },
  );

  await Promise.all([
    build({
      // Adds source mapping
      sourcemap: true,
      // The compiled code should be usable in node v12.22
      target: 'node12.22',
      // The source code's format is commonjs.
      format: 'cjs',

      outdir,
      entryPoints: [...filesToCompile, './index.js']
        .map(file => path.resolve(file)),
    }),

    // not passed to "build" because we need this file to stay as ESM instead of CJS
    copyFile('./index.mjs', path.resolve(outdir, './index.mjs')),

    exec('tsc', {
      env: {
        // binaries installed from modules have symlinks in
        // <pkg root>/node_modules/.bin.
        PATH: `${process.env.PATH || ''}:${path.join(
          rootDir,
          'node_modules/.bin',
        )}`,
      },
      cwd: rootDir,
    }),
  ]);
}

main().catch(console.error).finally(process.exit);