Fix no-process-exit issues (#9219)

See [`no-process-exit`](https://eslint.org/docs/rules/no-process-exit) for more information.

This change enables `no-process-exit` and fixes the issues raised by the rule.

.eslintrc.js

@@ -57,6 +57,7 @@ module.exports = {
     'no-loop-func': 'error',
     'no-nested-ternary': 'error',
     'no-plusplus': ['error', { 'allowForLoopAfterthoughts': true }],
+    'no-process-exit': 'error',
     'no-prototype-builtins': 'error',
     'no-useless-catch': 'error',
     'no-useless-concat': 'error',
@@ -143,6 +144,15 @@ module.exports = {
       // Mocha will re-assign `this` in a test context
       'babel/no-invalid-this': 'off',
     },
+  }, {
+    files: [
+      'development/**/*.js',
+      'test/e2e/benchmark.js',
+      'test/helper.js',
+    ],
+    rules: {
+      'no-process-exit': 'off',
+    },
   }],
 
   settings: {