feat(check_peer_dependencies): Added a script which checks that all p…

…eer dependencies are satisfied

npx check_peer_dependencies (--yarn | --npm) [--install]

check_peer_dependencies.js

@@ -0,0 +1,183 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const semver = require('semver');
+const util = require('./util');
+const yargs = require('yargs')
+    .option('help', {
+      alias: 'h',
+      boolean: true,
+      description: `Print usage information`,
+    })
+    .option('yarn', {
+      boolean: true,
+      description: `Use yarn package manager`,
+    })
+    .option('npm', {
+      boolean: true,
+      description: `Use npm package manager`,
+    })
+    .option('install', {
+      boolean: true,
+      description: 'Install missing or incorrect peerDependencies'
+    })
+    .check(argv => {
+      if (argv.yarn && argv.npm) {
+        throw new Error('Specify either --yarn or --npm but not both');
+      } else if (!argv.yarn && !argv.npm) {
+        throw new Error('Specify either --yarn or --npm');
+      }
+      return true;
+    });
+
+if (yargs.argv.help) {
+  process.exit(-2);
+}
+
+const PACKAGEJSON = 'package.json';
+const NODEMODULES = 'node_modules';
+
+const readFile = filename => JSON.parse(fs.readFileSync(filename).toString('utf-8'));
+
+const visitedDeps = [];
+const peerDeps = [];
+
+checkInstalledPackage(readFile(PACKAGEJSON));
+
+function getDependencies(packageJson) {
+  const { name, dependencies = {}, peerDependencies = {} } = packageJson;
+  return {
+    name,
+    dependencies: Object.keys(dependencies).map(name => ({ name, version: dependencies[ name ] })),
+    peerDependencies: Object.keys(peerDependencies).map(name => ({ name, version: peerDependencies[ name ] })),
+  };
+}
+
+
+function checkInstalledPackage(packageJson) {
+  const { name, dependencies, peerDependencies } = getDependencies(packageJson);
+  if (visitedDeps.includes(name)) {
+    return;
+  }
+  visitedDeps.push(name);
+
+  peerDependencies.forEach(peer => peerDeps.push({ ...peer, depender: `${packageJson.name}@${packageJson.version}` }));
+  dependencies.forEach(dependency => {
+    const dependencyName = dependency.name;
+    const installedPkgDir = `${NODEMODULES}/${dependencyName}`;
+    const nestedPkgJson = `${installedPkgDir}/${PACKAGEJSON}`;
+    const nestedPkg = readFile(nestedPkgJson);
+    checkInstalledPackage(nestedPkg)
+  });
+}
+
+console.log('Peer Dependencies:');
+peerDeps.forEach(dep => console.log(`${dep.depender} requires ${dep.name} ${dep.version}`));
+console.log('');
+
+const missingPeers = [];
+const incorrectPeers = [];
+
+function handleMissingPeerDependency(peerDependency) {
+  missingPeers.push(peerDependency);
+}
+
+function handleIncorrectPeerDependency(peerDependency, installedVersion) {
+  incorrectPeers.push({ ...peerDependency, installedVersion });
+}
+
+/**
+ * Given a peerDependency, checks that the installed version of the package satisfies the required version
+ */
+function checkPeerDependency(peerDependency) {
+  const pkgJsonFile = `${NODEMODULES}/${peerDependency.name}/${PACKAGEJSON}`;
+  const exists = fs.existsSync(pkgJsonFile);
+  if (!exists) {
+    return handleMissingPeerDependency(peerDependency);
+  }
+
+  const installedVersion = readFile(pkgJsonFile).version;
+
+  if (!semver.satisfies(installedVersion, peerDependency.version)) {
+    handleIncorrectPeerDependency(peerDependency, installedVersion);
+  }
+}
+
+peerDeps.forEach(checkPeerDependency);
+
+if (missingPeers.length || incorrectPeers.length) {
+  console.log('Problems found:');
+  missingPeers.forEach(peer => console.error(`Missing peer dependency: ${peer.name}@${peer.version} depended on by ${peer.depender}`));
+  incorrectPeers.forEach(peer =>
+      console.error(`Incorrect peer dependency: ${peer.name}@${peer.installedVersion} installed but ${peer.depender} requires ${peer.version}.`));
+  console.error();
+}
+
+function semverReverseSort(a, b) {
+  const lt = semver.lt(a, b);
+  const gt = semver.gt(a, b);
+  if (!lt && !gt) {
+    return 0;
+  } else if (lt) {
+    return 1;
+  }
+  return -1;
+}
+
+const adds = [];
+const upgrades = [];
+
+function findPossibleResolution(packageName, allPeerDeps, isMissing = false) {
+  const requiredPeerVersions = allPeerDeps.filter(dep => dep.name === packageName);
+  const rawVersionsInfo = util._exec(`npm view ${packageName} versions`, true).stdout;
+  const availableVersions = JSON.parse(rawVersionsInfo.replace(/'/g, '"')).sort(semverReverseSort);
+
+  const foundVer = availableVersions.find(ver => requiredPeerVersions.every(peerVer => semver.satisfies(ver, peerVer.version)));
+  if (!foundVer) {
+    console.error(`Unable to find a version for ${packageName} that satisfies the following peerDependencies:`);
+    requiredPeerVersions.forEach(peer => console.error(`${peer.depender} requires ${peer.name} ${peer.version}`));
+    throw new Error(`Unable to find a version for ${packageName} that satisfies ` +
+        `the following peerDependencies: ${requiredPeerVersions.map(x => x.version).join()}`);
+  }
+
+  console.log(`found ${packageName}@${foundVer} which satisfies ${requiredPeerVersions.join(',')}`);
+
+  (isMissing ? adds : upgrades).push(`${packageName}@${foundVer}`);
+}
+
+
+const missingPackages = missingPeers.map(x => x.name).reduce((acc, x) => acc.includes(x) ? acc : acc.concat(x), []);
+const incorrectPackages = incorrectPeers.map(x => x.name).reduce((acc, x) => acc.includes(x) ? acc : acc.concat(x), []);
+if (missingPackages.length || incorrectPackages.length) {
+  console.log('Searching for solutions:');
+  missingPackages.forEach(peer => findPossibleResolution(peer, peerDeps, true));
+  incorrectPackages.forEach(peer => findPossibleResolution(peer, peerDeps, false));
+  console.log();
+}
+
+function getCommandLines() {
+  const commands = [];
+  if (yargs.argv.yarn) {
+    if (adds.length) {
+      commands.push(`yarn add ${adds.join(' ')}`);
+    }
+    if (upgrades.length) {
+      commands.push(`yarn upgrade ${upgrades.join(' ')}`);
+    }
+  } else {
+    commands.push(`npm install ${adds.concat(upgrades).join(' ')}`)
+  }
+  return commands;
+}
+
+const commandLines = getCommandLines();
+if (commandLines.length) {
+  console.log('Commands:');
+  commandLines.forEach(command => {
+    if (yargs.argv.install) {
+      util._exec(command);
+    } else {
+      console.log(command);
+    }
+  });
+}

package.json

@@ -18,6 +18,7 @@
   },
   "bin": {
     "artifact_tagging": "./artifact_tagging.js",
+    "check_peer_dependencies": "./check_peer_dependencies.js",
     "ensure_clean_master": "./ensure_clean_master.js",
     "generate_docs": "./generate_docs.js",
     "modify_sourcemap_paths": "./modify_sourcemap_paths.js",