.pnpmfile.cjs

const {dependencies, devDependencies} = require(`./package.json`);

/**
 * bud.js pnpm compatibility shim
 *
 * pnpm allows customizing the package installation process through special functions called hooks.
 * These hooks can be defined in a .pnpmfile.cjs file, which should be located in the same directory
 * as the lockfile. For example, in a monorepo with a shared lockfile, the .pnpmfile.cjs file should
 * be placed in the root of the monorepo.
 *
 * @see {@link https://pnpm.io/pnpmfile} for more information on pnpmfile
 */
module.exports = {
    hooks: {
        /**
         * This hook removes peerDependencies from @roots/* packages because
         * pnpm does not install peerDependencies marked as optional by default.
         * This behavior differs from npm and yarn, which install peerDependencies
         * even if they are marked as optional.
         */
        readPackage(data) {
            // Skip processing if the package is not a @roots/* package
            if (!data.name.startsWith(`@roots`)) return data;

            // Skip processing if the package does not have peerDependencies
            if (!data.peerDependencies) return data;

            // Filter out peerDependencies that are already listed as dependencies or devDependencies
            const peerDependencies = Object.entries(data.peerDependencies)
                .filter(
                    ([signifier]) =>
                        Object.keys(dependencies || {}).includes(signifier) ||
                        Object.keys(devDependencies || {}).includes(signifier),
                )
                .reduce(
                    (peerDependencies, [signifier, version]) => ({
                        ...peerDependencies,
                        [signifier]: version,
                    }),
                    {},
                );

            // Return the package data with the filtered peerDependencies
            // and an empty peerDependenciesMeta object
            return Object.assign(data, {
                peerDependencies,
                peerDependenciesMeta: {},
            });
        },
    },
};