prettier-plugin-space-before-function-paren

prettier-plugin-space-before-function-paren

A prettier plugin to add a space before function parentheses for function definitions (but not function calls) in JS. Requires Prettier 3.0.0 or later.

Installation

npm install -D prettier prettier-plugin-space-before-function-paren

Configuration

There are no config options for this plugin. All you need to do is actually include it in your Prettier config:

{
	"plugins": ["prettier-plugin-space-before-function-paren"]
}

What this plugin changes

Function declaration

function test(a, b) {
	return a + b;
}

becomes:

function test (a, b) {
	return a + b;
}

Async function declaration

async function test(a, b) {
	return a + b;
}

becomes:

async function test (a, b) {
	return a + b;
}

Class methods

class Foo {
	method(a, b) {
		return a + b;
	}
}

becomes:

class Foo {
	method (a, b) {
		return a + b;
	}
}

Async class methods

class Foo {
	async method(a, b) {
		return a + b;
	}
}

becomes:

class Foo {
	async method (a, b) {
		return a + b;
	}
}

Static class methods

class Foo {
	static method(a, b) {
		return a + b;
	}
}

becomes:

class Foo {
	static method (a, b) {
		return a + b;
	}
}

Class getters

class Foo {
	get foo() {
		return true;
	}
}

becomes:

class Foo {
	get foo () {
		return true;
	}
}

Class setters

class Foo {
	set foo(value) {
		this._foo = value;
	}
}

becomes:

class Foo {
	set foo (value) {
		this._foo = value;
	}
}

Generator functions

function* test() {
	yield 1;
}

becomes:

function* test () {
	yield 1;
}

What remains unchanged

Function calls

test(1, 2);

becomes:

test(1, 2);

Arrow function

const add = (a, b) => a + b;

becomes:

const add = (a, b) => a + b;

Anonymous functions

Prettier already handles this case.

const add = function(a, b) {
	return a + b;
};

becomes:

const add = function (a, b) {
	return a + b;
};

Status

Current version is a proof of concept, please try it out and give feedback!