Find conflicting package.json ranges in mono repository

find-version-range-conflicts.ts

/**
 * This is a simple script for detecting conflicting
 * version ranges across packages inside a mono repository.
 */
import fs from "fs";
import glob from "glob"; // yarn add -W -E -E -D glob@7.1.6
import { promisify } from "util";

const globP = promisify(glob);

const main = async () => {
  const filePaths = await globP("**/package.json", {
    root: process.cwd(),
    ignore: ["**/node_modules/**", "**/dist/**"],
  });

  const moduleMap = new Map<string, Set<string>>();
  const gatherDependencies = (record: { [key: string]: string }) => {
    for (const [packageName, version] of Object.entries(record)) {
      let moduleVersions = moduleMap.get(packageName);
      if (moduleVersions === undefined) {
        const newSet = new Set<string>();
        moduleMap.set(packageName, newSet);
        moduleVersions = newSet;
      }
      moduleVersions.add(version);
    }
  };
  for (const filePath of filePaths) {
    const obj = JSON.parse(fs.readFileSync(filePath, "utf-8"));
    if (obj.dependencies) {
      gatherDependencies(obj.dependencies);
    }
    if (obj.devDependencies) {
      gatherDependencies(obj.devDependencies);
    }
  }

  for (const [packageName, versions] of moduleMap.entries()) {
    if (versions.size <= 1) {
      continue;
    }
    console.log(`${packageName}`, Array.from(versions).join(", "));
  }
};

main();