Which rule is used for converting this code
function sayHello() {
console.log("Hello world!");
}
into
function sayHello() {
console.log("Hello world!"); // No empty lines at the end and beginning
}
?
There's a rule for blocks: padded-blocks.
If enabled, an option is:
"blocks" require or disallow padding within block statements, function bodies, and class static blocks
There doesn't look to be a configurable option for functions in particular.
You'll want the config option:
[2, 'never']
or
[2, { blocks: 'never' }]