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Missing space after *. Open
commands[Symbol.iterator] = function*() {
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Enforce spacing around the * in generator functions (generator-star-spacing)
Generators are a new type of function in ECMAScript 6 that can return multiple values over time.
These special functions are indicated by placing an *
after the function
keyword.
Here is an example of a generator function:
/*eslint-env es6*/
function* generator() {
yield "44";
yield "55";
}
This is also valid:
/*eslint-env es6*/
function *generator() {
yield "44";
yield "55";
}
This is valid as well:
/*eslint-env es6*/
function * generator() {
yield "44";
yield "55";
}
To keep a sense of consistency when using generators this rule enforces a single position for the *
.
Rule Details
This rule aims to enforce spacing around the *
of generator functions.
Options
The rule takes one option, an object, which has two keys before
and after
having boolean values true
or false
.
-
before
enforces spacing between the*
and thefunction
keyword. If it istrue
, a space is required, otherwise spaces are disallowed.
In object literal shorthand methods, spacing before the *
is not checked, as they lack a function
keyword.
-
after
enforces spacing between the*
and the function name (or the opening parenthesis for anonymous generator functions). If it istrue
, a space is required, otherwise spaces are disallowed.
The default is {"before": true, "after": false}
.
An example configuration:
"generator-star-spacing": ["error", {"before": true, "after": false}]
And the option has shorthand as a string keyword:
-
{"before": true, "after": false}
→"before"
-
{"before": false, "after": true}
→"after"
-
{"before": true, "after": true}
→"both"
-
{"before": false, "after": false}
→"neither"
An example of shorthand configuration:
"generator-star-spacing": ["error", "after"]
Examples
before
Examples of correct code for this rule with the "before"
option:
/*eslint generator-star-spacing: ["error", {"before": true, "after": false}]*/
/*eslint-env es6*/
function *generator() {}
var anonymous = function *() {};
var shorthand = { *generator() {} };
after
Examples of correct code for this rule with the "after"
option:
/*eslint generator-star-spacing: ["error", {"before": false, "after": true}]*/
/*eslint-env es6*/
function* generator() {}
var anonymous = function* () {};
var shorthand = { * generator() {} };
both
Examples of correct code for this rule with the "both"
option:
/*eslint generator-star-spacing: ["error", {"before": true, "after": true}]*/
/*eslint-env es6*/
function * generator() {}
var anonymous = function * () {};
var shorthand = { * generator() {} };
neither
Examples of correct code for this rule with the "neither"
option:
/*eslint generator-star-spacing: ["error", {"before": false, "after": false}]*/
/*eslint-env es6*/
function*generator() {}
var anonymous = function*() {};
var shorthand = { *generator() {} };
When Not To Use It
If your project will not be using generators or you are not concerned with spacing consistency, you do not need this rule.