New rule: newline-before-if

1. This rule will warn when no newline before if statement.

Correct:

const a = 10;

if (a === 10) {
}

Incorrect:

const a = 10;
if (a === 10) {
}

1. This rule is stylistic only.
2. This rule is can be widely used as it increases code readability.
3. Yes. I can create rule by myself.

[nzakas]

JSCS has requireNewlineBeforeBlockStatements. I’m guessing we’d need the equivalent rather than one that is just specific to if.

[sindresorhus]

Would be useful to be able to enforce newline after a block too. Like requirePaddingNewLinesAfterBlocks. Maybe space-around-block.

Similar to http://eslint.org/docs/rules/padded-blocks, but outside blocks.

Related issue: https://github.com/eslint/eslint/issues/3092