Merge package.json files

merge-package-json.ts

import { readFileSync, writeFileSync } from "node:fs";
import { join } from "node:path";

interface PackageJson {
  dependencies: Record<string, string>;
  devDependencies: Record<string, string>;
  [key: string]: any;
}

function mergePackageJsons(current: PackageJson, toMerge: PackageJson): PackageJson {
  const merged: PackageJson = { ...current };

  const compareVersions = (v1: string, v2: string): string => {
    const clean1 = v1.replace(/[\^~>=]/g, '');
    const clean2 = v2.replace(/[\^~>=]/g, '');
    return clean1.localeCompare(clean2, undefined, { numeric: true }) >= 0 ? v1 : v2;
  };

  merged.dependencies = { ...merged.dependencies };
  for (const [pkg, version] of Object.entries(toMerge.dependencies || {})) {
    if (merged.dependencies[pkg]) {
      merged.dependencies[pkg] = compareVersions(merged.dependencies[pkg], version);
    } else if (merged.devDependencies?.[pkg]) {
      delete merged.devDependencies[pkg];
      merged.dependencies[pkg] = version;
    } else {
      merged.dependencies[pkg] = version;
    }
  }

  merged.devDependencies = { ...merged.devDependencies };
  for (const [pkg, version] of Object.entries(toMerge.devDependencies || {})) {
    if (merged.dependencies?.[pkg]) continue;
    if (merged.devDependencies[pkg]) {
      merged.devDependencies[pkg] = compareVersions(merged.devDependencies[pkg], version);
    } else {
      merged.devDependencies[pkg] = version;
    }
  }

  merged.dependencies = Object.fromEntries(
    Object.entries(merged.dependencies).sort(([a], [b]) => a.localeCompare(b))
  );
  merged.devDependencies = Object.fromEntries(
    Object.entries(merged.devDependencies).sort(([a], [b]) => a.localeCompare(b))
  );

  return merged;
}

const packageJsonPath: string = join(process.cwd(), "package.json");
const currentPackageJson: PackageJson = JSON.parse(
  readFileSync(packageJsonPath, "utf8")
) as PackageJson;

const toMergePackageJsons: PackageJson[] = [
  {
    dependencies: {
      "@radix-ui/react-accordion": "^1.2.0",
      "@radix-ui/react-dialog": "^1.1.1",
    },
    devDependencies: {
      "@tailwindcss/typography": "^0.5.13",
    }
  },
  // Add more package.json objects here if needed
];

let mergedPackageJson = currentPackageJson;
for (const toMergePackageJson of toMergePackageJsons) {
  mergedPackageJson = mergePackageJsons(mergedPackageJson, toMergePackageJson);
}

writeFileSync(
  packageJsonPath,
  JSON.stringify(mergedPackageJson, null, 2) + "\n"
);