func-call-spacing.md

规则名	规则类型	关联规则
func-call-spacing	layout	no-spaced-func

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:

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

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

new Date();
new Date ();

规则详解

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

配置项

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

选项 "never" 默认值的 错误 代码示例：

/*eslint func-call-spacing: ["error", "never"]*/

fn ();

fn
();

选项 "never" 默认值的 正确 代码示例：

::: correct

/*eslint func-call-spacing: ["error", "never"]*/

fn();

always

选项 "always" 的 错误 代码示例：

/*eslint func-call-spacing: ["error", "always"]*/

fn();

fn
();

选项 "always" 的 正确 代码示例：

::: correct

/*eslint func-call-spacing: ["error", "always"]*/

fn ();

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:

/*eslint func-call-spacing: ["error", "always", { "allowNewlines": true }]*/

fn();

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

::: correct

/*eslint func-call-spacing: ["error", "always", { "allowNewlines": true }]*/

fn (); // Newlines are never required.

fn
();

禁用建议

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

兼容

• JSCS: disallowSpacesInCallExpression
• JSCS: requireSpacesInCallExpression