indent: bug in flatTernaryExpressions: true

Tell us about your environment Linux Mint 18.3

• ESLint Version: 5.13.0
• Node Version: 8.11.2
• npm Version: 5.6.0

What parser (default, Babel-ESLint, etc.) are you using? Espree

Please show your full configuration:

Configuration

module.exports = {
  root: true,
  rules: {
    'no-undef': 0,
    'no-unused-vars': 0,
    'operator-linebreak': 0,
  }
}

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

// test1.js
/* eslint "indent": ["error", 2, {flatTernaryExpressions:true}] */

var a = foo
  ? bar : baz
  ? qux : boop

eslint ./test1.js

What did you expect to happen? no errors. Note the option flatTernaryExpressions:true in the config comment.

For this test, I made a simple eslintrc without rules, plugins, etc., but the same thing happens with the typedscript parser and the VS Code ESLint extension.

What actually happened? Please include the actual, raw output from ESLint.

/home/xxxxxx/npm/eslint-config-standardize/test1.js 6:1 error Expected indentation of 4 spaces but found 2 indent

✖ 1 problem (1 error, 0 warnings) 1 error and 0 warnings potentially fixable with the --fix option.

Are you willing to submit a pull request to fix this bug? no.

[mysticatea]

Thank you for this issue.

Looks like the intentional behavior.

By design, flatTernaryExpressions:true option affects only when a condition and that result are on the same line. I.e.

var a =
  foo ? bar :
  baz ? qux :
  boop

The option is to support the style like Conditional Types.

type TypeName<T> =
    T extends string ? "string" :
    T extends number ? "number" :
    T extends boolean ? "boolean" :
    T extends undefined ? "undefined" :
    T extends Function ? "function" :
    "object";

[eslint-deprecated[bot]]

It looks like the conversation is stalled here. As this is a question rather than an action item, I’m closing the issue. If you still need help, please send a message to our mailing list or chatroom. Thanks! [//]: # (auto-close)