Require or disallow padding within blocks
Some problems reported by this rule are automatically fixable by the --fix command line option
Some style guides require block statements to start and end with blank lines. The goal is to improve readability by visually separating the block content and the surrounding code.
if (a) {
b();
}
Since it’s good to have a consistent code style, you should either always write padded blocks or never do it.
This rule enforces consistent empty line padding within blocks.
This rule has two options, the first one can be a string option or an object option. The second one is an object option, it can allow exceptions.
String option:
"always" (default) requires empty lines at the beginning and ending of block statements, function bodies, class static blocks, classes, and switch statements."never" disallows empty lines at the beginning and ending of block statements, function bodies, class static blocks, classes, and switch statements.Object option:
"blocks" require or disallow padding within block statements, function bodies, and class static blocks"classes" require or disallow padding within classes"switches" require or disallow padding within switch statements"allowSingleLineBlocks": true allows single-line blocksExamples of incorrect code for this rule with the default "always" option:
/*eslint padded-blocks: ["error", "always"]*/
if (a) {
b();
}
if (a) { b(); }
if (a)
{
b();
}
if (a) {
b();
}
if (a) {
// comment
b();
}
class C {
static {
a();
}
}
Examples of correct code for this rule with the default "always" option:
/*eslint padded-blocks: ["error", "always"]*/
if (a) {
b();
}
if (a)
{
b();
}
if (a) {
// comment
b();
}
class C {
static {
a();
}
}
Examples of incorrect code for this rule with the "never" option:
/*eslint padded-blocks: ["error", "never"]*/
if (a) {
b();
}
if (a)
{
b();
}
if (a) {
b();
}
if (a) {
b();
}
class C {
static {
a();
}
}
Examples of correct code for this rule with the "never" option:
/*eslint padded-blocks: ["error", "never"]*/
if (a) {
b();
}
if (a)
{
b();
}
class C {
static {
a();
}
}
Examples of incorrect code for this rule with the { "blocks": "always" } option:
/*eslint padded-blocks: ["error", { "blocks": "always" }]*/
if (a) {
b();
}
if (a) { b(); }
if (a)
{
b();
}
if (a) {
b();
}
if (a) {
b();
}
if (a) {
// comment
b();
}
class C {
static {
a();
}
}
Examples of correct code for this rule with the { "blocks": "always" } option:
/*eslint padded-blocks: ["error", { "blocks": "always" }]*/
if (a) {
b();
}
if (a)
{
b();
}
if (a) {
// comment
b();
}
class C {
static {
a();
}
}
class D {
static {
a();
}
}
Examples of incorrect code for this rule with the { "blocks": "never" } option:
/*eslint padded-blocks: ["error", { "blocks": "never" }]*/
if (a) {
b();
}
if (a)
{
b();
}
if (a) {
b();
}
if (a) {
b();
}
class C {
static {
a();
}
}
Examples of correct code for this rule with the { "blocks": "never" } option:
/*eslint padded-blocks: ["error", { "blocks": "never" }]*/
if (a) {
b();
}
if (a)
{
b();
}
class C {
static {
a();
}
}
class D {
static {
a();
}
}
Examples of incorrect code for this rule with the { "classes": "always" } option:
/*eslint padded-blocks: ["error", { "classes": "always" }]*/
class A {
constructor(){
}
}
Examples of correct code for this rule with the { "classes": "always" } option:
/*eslint padded-blocks: ["error", { "classes": "always" }]*/
class A {
constructor(){
}
}
Examples of incorrect code for this rule with the { "classes": "never" } option:
/*eslint padded-blocks: ["error", { "classes": "never" }]*/
class A {
constructor(){
}
}
Examples of correct code for this rule with the { "classes": "never" } option:
/*eslint padded-blocks: ["error", { "classes": "never" }]*/
class A {
constructor(){
}
}
Examples of incorrect code for this rule with the { "switches": "always" } option:
/*eslint padded-blocks: ["error", { "switches": "always" }]*/
switch (a) {
case 0: foo();
}
Examples of correct code for this rule with the { "switches": "always" } option:
/*eslint padded-blocks: ["error", { "switches": "always" }]*/
switch (a) {
case 0: foo();
}
if (a) {
b();
}
Examples of incorrect code for this rule with the { "switches": "never" } option:
/*eslint padded-blocks: ["error", { "switches": "never" }]*/
switch (a) {
case 0: foo();
}
Examples of correct code for this rule with the { "switches": "never" } option:
/*eslint padded-blocks: ["error", { "switches": "never" }]*/
switch (a) {
case 0: foo();
}
if (a) {
b();
}
Examples of incorrect code for this rule with the "always", {"allowSingleLineBlocks": true} options:
/*eslint padded-blocks: ["error", "always", { allowSingleLineBlocks: true }]*/
if (a) {
b();
}
if (a) {
b();
}
if (a) {
b();
}
Examples of correct code for this rule with the "always", {"allowSingleLineBlocks": true} options:
/*eslint padded-blocks: ["error", "always", { allowSingleLineBlocks: true }]*/
if (a) { b(); }
if (a) {
b();
}
You can turn this rule off if you are not concerned with the consistency of padding within blocks.
This rule was introduced in ESLint v0.9.0.
© OpenJS Foundation and other contributors
Licensed under the MIT License.
https://eslint.org/docs/latest/rules/padded-blocks