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@stylistic/

function-call-spacing

When calling a function, developers may insert optional whitespace between the function's name and the parentheses that invoke it. The following pairs of function calls are equivalent:

js
alert('Hello');
alert ('Hello');

console.log(42);
console.log (42);

new Date();
new Date ();

Rule Details

This rule requires or disallows spaces between the function name and the opening parenthesis that calls it.

Options

This rule has a string option:

  • "never" (default) disallows space between the function name and the opening parenthesis.
  • "always" requires space between the function name and the opening parenthesis.

Further, in "always" mode, a second object option is available that contains a single boolean allowNewlines property.

never

Examples of incorrect code for this rule with the default "never" option:

js
/*eslint @stylistic/function-call-spacing: ["error", "never"]*/

f
n ();
f
n
();
incorrect

Examples of correct code for this rule with the default "never" option:

js
/*eslint @stylistic/function-call-spacing: ["error", "never"]*/

fn();
correct

always

Examples of incorrect code for this rule with the "always" option:

js
/*eslint @stylistic/function-call-spacing: ["error", "always"]*/

f
n();
f
n
();
incorrect

Examples of correct code for this rule with the "always" option:

js
/*eslint @stylistic/function-call-spacing: ["error", "always"]*/

fn ();
correct

allowNewlines

By default, "always" does not allow newlines. To permit newlines when in "always" mode, set the allowNewlines option to true. Newlines are never required.

Examples of incorrect code for this rule with allowNewlines option enabled:

js
/*eslint @stylistic/function-call-spacing: ["error", "always", { "allowNewlines": true }]*/

f
n();
incorrect

Examples of correct code for this rule with the allowNewlines option enabled:

js
/*eslint @stylistic/function-call-spacing: ["error", "always", { "allowNewlines": true }]*/

fn (); // Newlines are never required.

fn
();
correct

When Not To Use It

This rule can safely be turned off if your project does not care about enforcing a consistent style for spacing within function calls.

Compatibility

Released under the MIT License.