enforce consistent linebreak style for operators (operator-linebreak)

The --fix option on the command line can automatically fix some of the problems reported by this rule.

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:

Object option:

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;

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;

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;

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;

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;

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;

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.

Version

This rule was introduced in ESLint 0.19.0.

Resources