set up minimal eslint system

eslint.config.js

@@ -0,0 +1,39 @@
+
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2020, // Allows for the parsing of modern ECMAScript features
+    sourceType: 'module' // Allows for the use of imports
+  },
+  plugins: [
+    '@typescript-eslint',
+    'react'
+  ],
+  settings: {
+    react: {
+      version: 'detect'
+    }
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:react/recommended'
+  ],
+  rules: {
+    'no-unused-vars': 0, // because can't get jsxFactory to work. and don't like func arg stipulation
+    'no-undef': 0, // because tsc does this. hard to make work with tests globals
+    'prefer-const': 0,
+    'prefer-spread': 0,
+    'prefer-rest-params': 0,
+    'react/react-in-jsx-scope': 0, // requires React to always be imported
+    'react/display-name': 0,
+    'react/prop-types': 0,
+
+    '@typescript-eslint/ban-types': 'error'
+
+    // TODO: enable lots of typescript rules found here:
+    // https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/eslint-plugin/docs/rules
+    // The reason we didn't enable 'plugin:@typescript-eslint/recommended' was because it required
+    // REALLY slow ts processing. Somehow enable all rules that DON'T cause things to be slow.
+  }
+}

gulpfile.js

@@ -13,6 +13,7 @@ const exec = require('./scripts/lib/shell').sync.withOptions({ // always SYNC!
 const concurrently = require('concurrently')
 const { minifyBundleJs, minifyBundleCss } = require('./scripts/lib/minify')
 const modify = require('gulp-modify-file')
+const { allStructs } = require('./scripts/lib/package-index')
 
 
 
@@ -329,3 +330,39 @@ function execParallel(map) {
   func.displayName = 'concurrently'
   return func
 }
+
+
+
+const exec3 = require('./scripts/lib/shell').sync.withOptions({
+  live: true,
+  exitOnError: false
+})
+
+exports.eslint = function() {
+  let anyFailures = false
+
+  for (let struct of allStructs) {
+    if (struct.name !== '@fullcalendar/core-vdom') {
+      let cmd = [
+        'eslint', '--config', 'eslint.config.js',
+        path.join(struct.dir, 'src'),
+        '--ext', '.ts,.tsx,.js,.jsx'
+      ]
+
+      console.log('Running eslint on', struct.name, '...')
+      console.log(cmd.join(' '))
+      console.log()
+
+      let { success } = exec3(cmd)
+      if (!success) {
+        anyFailures = true
+      }
+    }
+  }
+
+  if (anyFailures) {
+    return Promise.reject(new Error('At least one linting job failed'))
+  }
+
+  return Promise.resolve()
+}

package.json

@@ -60,18 +60,16 @@
     "@types/jquery": "^3.3.29",
     "@types/luxon": "^1.12.0",
     "@types/node": "^12.12.14",
+    "@typescript-eslint/eslint-plugin": "^3.1.0",
+    "@typescript-eslint/parser": "^3.1.0",
     "bootstrap": "^3.4.1",
     "chokidar": "^2.1.5",
     "components-jqueryui": "github:components/jqueryui",
     "concurrently": "^4.1.1",
     "css-loader": "^3.5.3",
     "dragula": "^3.7.2",
-    "eslint": "^5.16.0",
-    "eslint-config-standard": "^12.0.0",
-    "eslint-plugin-import": "^2.17.2",
-    "eslint-plugin-node": "^9.1.0",
-    "eslint-plugin-promise": "^4.1.1",
-    "eslint-plugin-standard": "^4.0.0",
+    "eslint": "^7.2.0",
+    "eslint-plugin-react": "^7.20.0",
     "glob": "^7.1.3",
     "globby": "^11.0.0",
     "gulp": "^4.0.2",