open-wc/scripts/generate-ts-configs.mjs

import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import { packages } from '../workspace-packages.mjs';
import merge from 'deepmerge';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const TSCONFIG_COMMENT = `// Don't edit this file directly. It is generated by /scripts/update-package-configs.ts\n\n`;

const packagesRoot = path.join(__dirname, '..', 'packages');

const packageJSONMap = new Map();
const packageDirnameMap = new Map();
const internalDependencyMap = new Map();

// collect package json for all packages
packages.forEach(pkg => {
  const packageJSONPath = path.join(packagesRoot, pkg.name, 'package.json');
  if (!fs.existsSync(packageJSONPath)) {
    console.error();
    console.error(`Could not find package.json: ${packageJSONPath}`);
    console.error();
    process.exit(1);
  }

  const packageJSONData = JSON.parse(fs.readFileSync(packageJSONPath).toString());
  const packageName = packageJSONData.name;
  packageDirnameMap.set(packageName, pkg.name);
  packageJSONMap.set(packageName, packageJSONData);
});

// collect initial cross package dependencies info
packageDirnameMap.forEach((_packageDirname, packageName) => {
  const { dependencies, devDependencies } = packageJSONMap.get(packageName);

  const internalDependencies = [
    ...(dependencies ? Object.keys(dependencies) : []),
    ...(devDependencies ? Object.keys(devDependencies) : []),
  ].filter(dep => packageDirnameMap.has(dep));

  internalDependencyMap.set(packageName, internalDependencies);
});

function resolveInternalDependencies(dependencies) {
  const childDeps = [];

  for (const idep of dependencies) {
    const deps = internalDependencyMap.get(idep);
    const res = resolveInternalDependencies(deps);
    for (const jdep of res) {
      childDeps.push(jdep);
    }
  }
  const resolved = childDeps.concat(dependencies);
  // remove all duplicated after the first appearance
  return resolved.filter((item, idx) => resolved.indexOf(item) === idx);
}

packageDirnameMap.forEach((packageDirname, packageName) => {
  const pkg = packages.find(pkg => pkg.name === packageDirname);
  const pkgDir = path.join(packagesRoot, packageDirname);

  const tsconfigPath = path.join(pkgDir, 'tsconfig.json');

  let tsConfigOverride = {};
  const tsConfigOverridePath = path.join(pkgDir, 'tsconfig.override.json');

  if (fs.existsSync(tsConfigOverridePath)) {
    tsConfigOverride = JSON.parse(fs.readFileSync(tsConfigOverridePath));
  }
  const overwriteMerge = (destinationArray, sourceArray) => sourceArray;

  const internalDependencies = resolveInternalDependencies(internalDependencyMap.get(packageName));
  const tsconfigData = merge(
    {
      extends: `../../tsconfig.${pkg.environment === 'browser' ? 'browser' : 'node'}-base.json`,
      compilerOptions: {
        module: pkg.environment === 'browser' ? 'ESNext' : 'commonjs',
        outDir: './types',
        rootDir: '.',
        composite: true,
        allowJs: true,
        checkJs: pkg.type === 'js' ? true : undefined,
        emitDeclarationOnly: pkg.type === 'js' ? true : undefined,
      },
      references: internalDependencies.map(dep => {
        return { path: `../${packageDirnameMap.get(dep)}/tsconfig.json` };
      }),
      include: ['src', '*.js'],
      exclude: ['dist', 'types'],
    },
    tsConfigOverride,
    { arrayMerge: overwriteMerge },
  );
  fs.writeFileSync(tsconfigPath, TSCONFIG_COMMENT + JSON.stringify(tsconfigData, null, '  '));
});

const projectLevelTsconfigPath = path.join(__dirname, '..', 'tsconfig.json');

const projectLevelTsconfigData = {
  extends: './tsconfig.node-base.json',
  files: [],
  references: resolveInternalDependencies(Array.from(packageDirnameMap.keys())).map(
    packageName => ({
      path: `./packages/${packageDirnameMap.get(packageName)}/tsconfig.json`,
    }),
  ),
};

fs.writeFileSync(
  projectLevelTsconfigPath,
  TSCONFIG_COMMENT + JSON.stringify(projectLevelTsconfigData, null, '  '),
);