ESLintoperator-linebreak
The --fix option on the command line can automatically fix some of the problems reported by this rule.
Enforces consistent linebreak style for operators.
When a statement is too long to fit on a single line, line breaks are generally inserted next to the operators separating expressions. The first style coming to mind would be to place the operator at the end of the line, following the English punctuation rules.
var fullHeight = borderTop +
innerHeight +
borderBottom;
Some developers find that placing operators at the beginning of the line makes the code more readable.
var fullHeight = borderTop
+ innerHeight
+ borderBottom;
Rule Details
This rule enforces a consistent linebreak style for operators.
Options
This rule has two options, a string option and an object option.
String option:
"after"requires linebreaks to be placed after the operator"before"requires linebreaks to be placed before the operator"none"disallows linebreaks on either side of the operator
Object option:
"overrides"overrides the global setting for specified operators
The default configuration is "after", { "overrides": { "?": "before", ":": "before" } }
after
Examples of incorrect code for this rule with the "after" option:
/*eslint operator-linebreak: ["error", "after"]*/
foo = 1
+
2;
foo = 1
+ 2;
foo
= 5;
if (someCondition
|| otherCondition) {
}
answer = everything
? 42
: foo;
class Foo {
a
= 1;
[b]
= 2;
[c
]
= 3;
}
Examples of correct code for this rule with the "after" option:
/*eslint operator-linebreak: ["error", "after"]*/
foo = 1 + 2;
foo = 1 +
2;
foo =
5;
if (someCondition ||
otherCondition) {
}
answer = everything ?
42 :
foo;
class Foo {
a =
1;
[b] =
2;
[c
] =
3;
d = 4;
}
before
Examples of incorrect code for this rule with the "before" option:
/*eslint operator-linebreak: ["error", "before"]*/
foo = 1 +
2;
foo =
5;
if (someCondition ||
otherCondition) {
}
answer = everything ?
42 :
foo;
class Foo {
a =
1;
[b] =
2;
[c
] =
3;
}
Examples of correct code for this rule with the "before" option:
/*eslint operator-linebreak: ["error", "before"]*/
foo = 1 + 2;
foo = 1
+ 2;
foo
= 5;
if (someCondition
|| otherCondition) {
}
answer = everything
? 42
: foo;
class Foo {
a
= 1;
[b]
= 2;
[c
]
= 3;
d = 4;
}
none
Examples of incorrect code for this rule with the "none" option:
/*eslint operator-linebreak: ["error", "none"]*/
foo = 1 +
2;
foo = 1
+ 2;
if (someCondition ||
otherCondition) {
}
if (someCondition
|| otherCondition) {
}
answer = everything
? 42
: foo;
answer = everything ?
42 :
foo;
class Foo {
a =
1;
[b] =
2;
[c
] =
3;
d
= 4;
[e]
= 5;
[f
]
= 6;
}
Examples of correct code for this rule with the "none" option:
/*eslint operator-linebreak: ["error", "none"]*/
foo = 1 + 2;
foo = 5;
if (someCondition || otherCondition) {
}
answer = everything ? 42 : foo;
class Foo {
a = 1;
[b] = 2;
[c
] = 3;
d = 4;
[e] = 5;
[f
] = 6;
}
overrides
Examples of additional incorrect code for this rule with the { "overrides": { "+=": "before" } } option:
/*eslint operator-linebreak: ["error", "after", { "overrides": { "+=": "before" } }]*/
var thing = 'thing';
thing +=
's';
Examples of additional correct code for this rule with the { "overrides": { "+=": "before" } } option:
/*eslint operator-linebreak: ["error", "after", { "overrides": { "+=": "before" } }]*/
var thing = 'thing';
thing
+= 's';
Examples of additional correct code for this rule with the { "overrides": { "?": "ignore", ":": "ignore" } } option:
/*eslint operator-linebreak: ["error", "after", { "overrides": { "?": "ignore", ":": "ignore" } }]*/
answer = everything ?
42
: foo;
answer = everything
?
42
:
foo;
Examples of incorrect code for this rule with the default "after", { "overrides": { "?": "before", ":": "before" } } option:
/*eslint operator-linebreak: ["error", "after", { "overrides": { "?": "before", ":": "before" } }]*/
foo = 1
+
2;
foo = 1
+ 2;
foo
= 5;
if (someCondition
|| otherCondition) {
}
answer = everything ?
42 :
foo;
Examples of correct code for this rule with the default "after", { "overrides": { "?": "before", ":": "before" } } option:
/*eslint operator-linebreak: ["error", "after", { "overrides": { "?": "before", ":": "before" } }]*/
foo = 1 + 2;
foo = 1 +
2;
foo =
5;
if (someCondition ||
otherCondition) {
}
answer = everything
? 42
: foo;
When Not To Use It
If your project will not be using a common operator line break style, turn this rule off.
Related Rules
Version
This rule was introduced in ESLint 0.19.0.