@manypkg/tools/src/LernaTool.ts

import path from "path";

import { Tool, PackageJSON, Packages, InvalidMonorepoError } from "./Tool";
import {
  expandPackageGlobs,
  expandPackageGlobsSync,
} from "./expandPackageGlobs";
import { readJson, readJsonSync } from "./utils";

export interface LernaJson {
  useWorkspaces?: boolean;
  packages?: string[];
}

export const LernaTool: Tool = {
  type: "lerna",

  async isMonorepoRoot(directory: string): Promise<boolean> {
    try {
      const lernaJson = (await readJson(directory, "lerna.json")) as LernaJson;
      if (lernaJson.useWorkspaces !== true) {
        return true;
      }
    } catch (err) {
      if (err && (err as { code: string }).code === "ENOENT") {
        return false;
      }
      throw err;
    }
    return false;
  },

  isMonorepoRootSync(directory: string): boolean {
    try {
      const lernaJson = readJsonSync(directory, "lerna.json") as LernaJson;
      if (lernaJson.useWorkspaces !== true) {
        return true;
      }
    } catch (err) {
      if (err && (err as { code: string }).code === "ENOENT") {
        return false;
      }
      throw err;
    }
    return false;
  },

  async getPackages(directory: string): Promise<Packages> {
    const rootDir = path.resolve(directory);

    try {
      const lernaJson = (await readJson(rootDir, "lerna.json")) as LernaJson;
      const pkgJson = (await readJson(rootDir, "package.json")) as PackageJSON;
      const packageGlobs: string[] = lernaJson.packages || ["packages/*"];

      return {
        tool: LernaTool,
        packages: await expandPackageGlobs(packageGlobs, rootDir),
        rootPackage: {
          dir: rootDir,
          relativeDir: ".",
          packageJson: pkgJson,
        },
        rootDir,
      };
    } catch (err) {
      if (err && (err as { code: string }).code === "ENOENT") {
        throw new InvalidMonorepoError(
          `Directory ${rootDir} is not a valid ${LernaTool.type} monorepo root: missing lerna.json and/or package.json`
        );
      }
      throw err;
    }
  },

  getPackagesSync(directory: string): Packages {
    const rootDir = path.resolve(directory);

    try {
      const lernaJson = readJsonSync(rootDir, "lerna.json") as LernaJson;
      const pkgJson = readJsonSync(rootDir, "package.json") as PackageJSON;
      const packageGlobs: string[] = lernaJson.packages || ["packages/*"];

      return {
        tool: LernaTool,
        packages: expandPackageGlobsSync(packageGlobs, rootDir),
        rootPackage: {
          dir: rootDir,
          relativeDir: ".",
          packageJson: pkgJson,
        },
        rootDir,
      };
    } catch (err) {
      if (err && (err as { code: string }).code === "ENOENT") {
        throw new InvalidMonorepoError(
          `Directory ${rootDir} is not a valid ${LernaTool.type} monorepo root: missing lerna.json and/or package.json`
        );
      }
      throw err;
    }
  },
};