tslint: curly as-needed has no effect

Question

https://palantir.github.io/tslint/rules/curly/

I checked the document and added this in my tslint.json file.

"curly": [
  true, "as-needed"
],

However, when I ran tslint myapp.ts , I still got error like below.

ERROR: express-app/app.ts[28, 5]: if statements must be braced

The statement it mentioned looks like this.

    if (server)
      server.close(() => console.log('closed'));

But I think with that curly configuration, tslint would allow me to write if statements like this.

Environment

• tslint: 4.5.1
• typescript: 3.3.3333

Full tslint.json

{
  "extends": [
    "tslint:recommended"
  ],
  "jsRules": {},
  "rules": {
    "quotemark": [
      true,
      "single"
    ],
    "curly": [
      true, "as-needed"
    ],
    "radix": [
      false
    ],
    "arrow-parens": [
      true,
      "ban-single-arg-parens"
    ],
    "no-console": [
      true,
      "error"
    ]
  },
  "rulesDirectory": []
}

Answer 1

It looks like the "as-needed" option was added in tslint@5.4.0 .

To get it to work, update tslint to that version (by running npm i -D tslint@^5.4.0 , or however else you like to update your dependencies).

Note this crosses a major version bump so there may be breaking changes.