New task: ESLint

packages/just-scripts/src/tasks/eslintTask.ts

@@ -0,0 +1,36 @@
+import { resolve, logger, resolveCwd, TaskFunction } from 'just-task';
+import { encodeArgs, spawn } from 'just-scripts-utils';
+import fs from 'fs';
+
+export interface EsLintTaskOptions {
+  files?: string[];
+  configPath?: string;
+  ignorePath?: string;
+  fix?: boolean;
+  maxWarnings?: number;
+}
+
+export function eslintTask(options: EsLintTaskOptions = {}): TaskFunction {
+  return function eslint() {
+    const eslintCmd = resolve('eslint/bin/eslint.js');
+    const eslintConfigPath = (options && options.configPath) || resolveCwd('.eslintrc');
+    if (eslintCmd && eslintConfigPath && fs.existsSync(eslintConfigPath)) {
+      const eslintIgnorePath = (options && options.ignorePath) || resolveCwd('.eslintignore');
+
+      const eslintArgs = [
+        eslintCmd,
+        ...(options && options.files ? options.files : ['.']),
+        ...(eslintConfigPath ? ['--config', eslintConfigPath, '--no-eslintrc'] : []),
+        ...(eslintIgnorePath ? ['--ignore-path', eslintIgnorePath] : []),
+        ...(options && options.fix ? ['--fix'] : []),
+        ...(options && options.maxWarnings ? ['--max-warnings', `${options.maxWarnings}`] : []),
+        '--color'
+      ];
+
+      logger.info(encodeArgs(eslintArgs).join(' '));
+      return spawn(process.execPath, eslintArgs, { stdio: 'inherit' });
+    } else {
+      return Promise.resolve();
+    }
+  };
+}

packages/just-scripts/src/tasks/index.ts

@@ -11,3 +11,4 @@ export * from './upgradeRepoTask';
 export * from './upgradeStackTask';
 export * from './copyInstructionsTask';
 export * from './prettierTask';
+export * from './eslintTask';