Function enforceDevDependenciesAreProperlyDeclared

yarn.config.cjs:217–289

* Enforces proper declaration of dev dependencies. * * This rule checks if certain tools (like Prettier) are used in any workspace * and ensures they're declared as dev dependencies in those workspaces. * * @param {Context} context - The Yarn constraint context.

({ Yarn })

 * @param {Context} context - The Yarn constraint context.
 */
function enforceDevDependenciesAreProperlyDeclared({ Yarn }) {
  const dependencies = Object.fromEntries(
    Object.entries(enforcedDevDependencies).map(([key, { ident }]) => [
      key,
      Yarn.dependency({ ident }),
    ]),
  );

  for (const workspace of Yarn.workspaces()) {
    /** @type {Record<string, string> | undefined} */
    const scripts = workspace.manifest.scripts;

    if (!scripts) {
      continue;
    }

    const dependsOn = {
      prettier: false,
      waitOn: false,
      rimraf: false,
      eslint: false,
      typescript: false,
      crossEnv: false,
    };

    for (const script of Object.values(scripts)) {
      for (const [key, { commands }] of Object.entries(
        enforcedDevDependencies,
      )) {
        if (workspace.ident === "@local/eslint" && key === "eslint") {
          continue;
        }

        const scriptSplit = script.split(" ");

        if (commands.some((command) => scriptSplit.includes(command))) {
          dependsOn[key] = true;
        }
      }
    }

    for (const [key, value] of Object.entries(dependsOn)) {
      if (!value) {
        if (!dependencies[key]) {
          // dependency does not exist, so doesn't need to be enforced, as it doesn't exist
          continue;
        }

        if (
          allowedUnscriptedDevDependencies[workspace.ident]?.has(
            dependencies[key].ident,
          )
        ) {
          continue;
        }

        workspace.unset(`devDependencies.${dependencies[key].ident}`);
        continue;