[eslint config] [base] no-unused-expressions: flesh out options

Fixes airbnb#963.

Author: ljharb

packages/eslint-config-airbnb-base/rules/best-practices.js

@@ -189,7 +189,10 @@ module.exports = {
  'no-unmodified-loop-condition': 0,
 
  // disallow usage of expressions in statement position
- 'no-unused-expressions': 2,
+ 'no-unused-expressions': [2, {
+ allowShortCircuit: false,
+ allowTernary: false,
+ }],
 
  // disallow unused labels
  // http://eslint.org/docs/rules/no-unused-labels