Support yarn 🎉

Author: vladimyr

lib/cli.js

@@ -131,7 +131,7 @@ Promise.resolve()
         process.exit(1);
     });
 
-const SUPPORTED_INSTALLERS = ['npm', 'pnpm', 'ied'];
+const SUPPORTED_INSTALLERS = ['npm', 'pnpm', 'ied', 'yarn'];
 
 function detectPreferredInstaller(cwd) {
     return detectPreferredPM(cwd)

lib/out/install-packages.js

@@ -10,24 +10,29 @@ function install(packages, currentState) {
     }
 
     const installer = currentState.get('installer');
-    const installGlobal = currentState.get('global') ? '--global' : null;
-    const saveExact = currentState.get('saveExact') ? '--save-exact' : null;
+    const saveExact = currentState.get('saveExact')
+
+    const isYarn = installer === 'yarn';
+    const exact = saveExact ? (isYarn ? '--exact' : '--save-exact') : null;
     const color = chalk.supportsColor ? '--color=always' : null;
 
-    const npmArgs = ['install']
-        .concat(installGlobal)
-        .concat(saveExact)
+    const install = [isYarn ? 'add' : 'install'];
+    if (currentState.get('global')) {
+        isYarn ? install.unshift('global') : install.push('--global');
+    }
+    const args = install
         .concat(packages)
+        .concat(exact)
         .concat(color)
         .filter(Boolean);
 
     console.log('');
-    console.log(`$ ${chalk.green(installer)} ${chalk.green(npmArgs.join(' '))}`);
+    console.log(`$ ${chalk.green(installer)} ${chalk.green(args.join(' '))}`);
     const spinner = ora(`Installing using ${chalk.green(installer)}...`);
     spinner.enabled = spinner.enabled && currentState.get('spinner');
     spinner.start();
 
-    return execa(installer, npmArgs, {cwd: currentState.get('cwd')}).then(output => {
+    return execa(installer, args, {cwd: currentState.get('cwd')}).then(output => {
         spinner.stop();
         console.log(output.stdout);
         console.log(output.stderr);

lib/out/interactive-update.js

@@ -145,13 +145,17 @@ function interactive(currentState) {
         const updatedPackages = packagesToUpdate
             .map(pkg => pkg.moduleName + '@' + pkg.latest).join(', ');
 
+        const isYarn = currentState.get('installer') === 'yarn';
+
         if (!currentState.get('global')) {
             if (saveDependencies.length) {
-                saveDependencies.unshift('--save');
+                !isYarn && saveDependencies.push('--save');
             }
 
             if (saveDevDependencies.length) {
-                saveDevDependencies.unshift('--save-dev');
+                isYarn
+                    ? saveDevDependencies.push('--dev')
+                    : saveDevDependencies.push('--save-dev');
             }
         }
 

lib/out/static-output.js

@@ -14,8 +14,22 @@ function render(pkg, currentState) {
     const rows = [];
 
     const indent = '           ' + emoji('   ');
-    const flags = currentState.get('global') ? '--global' : `--save${pkg.devDependency ? '-dev' : ''}`;
-    const upgradeCommand = `npm install ${flags} ${packageName}@${pkg.latest}`;
+    const installer = currentState.get('installer');
+    const isYarn = installer === 'yarn';
+
+    const args = [isYarn ? 'add' : 'install'];
+    if (currentState.get('global')) {
+        isYarn ? args.unshift('global') : args.push('--global');
+    }
+
+    const flags = [];
+    if (isYarn) {
+        pkg.devDependency && flags.push('--dev');
+    } else {
+        pkg.devDependency ? flags.push('--save-dev') : flags.push('--save');
+    }
+
+    const upgradeCommand = `${installer} ${args.join(' ')} ${packageName}@${pkg.latest} ${flags.join(' ')}`;
     const upgradeMessage = `${chalk.green(upgradeCommand)} to go from ${pkg.installed} to ${pkg.latest}`;
     // DYLAN: clean this up
     const status = _([
@@ -35,7 +49,11 @@ function render(pkg, currentState) {
             indent + `Depcheck did not find code similar to ${chalk.green(`require('${packageName}')`)} or ${chalk.green(`import from '${packageName}'`)}.`,
             indent + `Check your code before removing as depcheck isn't able to foresee all ways dependencies can be used.`,
             indent + `Use ${chalk.green('--skip-unused')} to skip this check.`,
-            indent + `To remove this package: ${chalk.green(`npm uninstall --save${pkg.devDependency ? '-dev' : ''} ${packageName}`)}`
+            indent + `To remove this package: ${chalk.green(
+                isYarn
+                    ? `yarn remove ${packageName} ${pkg.devDependency ? '--dev' : ''}`
+                    : `npm uninstall --save${pkg.devDependency ? '-dev' : ''} ${packageName}`
+            )}`
         ] : '',
         pkg.mismatch && !pkg.bump ? chalk.bgRed.yellow.bold(emoji(' :interrobang: ') + ' MISMATCH ') + ' Installed version does not match package.json. ' + pkg.installed + ' ≠ ' + pkg.packageJson : '',
         pkg.regError ? chalk.bgRed.white.bold(emoji(' :no_entry: ') + ' NPM ERR! ') + ' ' + chalk.red(pkg.regError) : ''

lib/out/update-all.js

@@ -1,9 +1,6 @@
 'use strict';
 
-const _ = require('lodash');
-const inquirer = require('inquirer');
 const chalk = require('chalk');
-const table = require('text-table');
 const installPackages = require('./install-packages');
 const emoji = require('./emoji');
 
@@ -32,13 +29,17 @@ function updateAll(currentState) {
     const updatedPackages = packagesToUpdate
         .map(pkg => pkg.moduleName + '@' + pkg.latest).join(', ');
 
+    const isYarn = currentState.get('installer') === 'yarn';
+
     if (!currentState.get('global')) {
         if (saveDependencies.length) {
-            saveDependencies.unshift('--save');
+            !isYarn && saveDependencies.push('--save');
         }
 
         if (saveDevDependencies.length) {
-            saveDevDependencies.unshift('--save-dev');
+            isYarn
+                ? saveDevDependencies.push('--dev')
+                : saveDevDependencies.push('--save-dev');
         }
     }