Eslint JavaScript Format requirements

Indent 2 spaces in first line eslint:indent

Functionhello (name) {
  console.log (' Hi ', name)
}

Strings use single quotes (except to avoid escaping) eslint:quotes

Console.log (' Hello there ')
$ ("<div class= ' box ' >")

Prohibit unused variables Eslint:no-unused-vars

Functionmyfunction () {
  var result =something ()   //✗avoid
}

Add a space after the keyword eslint:keyword-spacing

if (condition) {...}   ✓ok

if (condition) {...}    ✗avoid

Add a space before the parentheses of the function declaration Eslint:space-before-function-paren

functionname (ARG) {...}   ✓ok

functionname (ARG) {...}    ✗avoid

Run (function () {...})      ✓ok

Run (function () {...})       ✗avoid

Use strict operator = = = Replace equality operator = = except obj = null allow check NULL | | Undefined Eslint:eqeqeq

if (name = = = ' john ')   //✓ok
if (name = = ' John ')    //✗avoid

if (name!== ' John ')   //✓ok
if (name!= ' John ')    //✗avoid

Infix operators must use a single space to separate eslint:space-infix-ops

✓ok
var x = 2
var message = ' Hello, ' + name + '! '

✗avoid
var x=2
var message = ' Hello, ' +name+ '! '

The comma immediately follows a space eslint:comma-spacing

✓ok
var list = [1, 2, 3, 4]
function greet (name, options) {...}

✗avoid
var list = [1,2,3,4]
function greet (name,options) {...}

Else and the back brackets remain on the same line Eslint:brace-style

✓ok
if (condition) {//...
} else {/
  /...
}

✗avoid
if (condition) {
  //...
}
else {
  //...
}

Multiline if declaration, using curly braces eslint:curly

✓ok
if (Options.quiet!== true) console.log (' Done ')

✓ok
if (Options.quiet!== true) {
  console.log (' Done ')
}

✗avoid
if (Options.quiet!== true)
  console.log (' Done ')

function parameter err must handle Eslint:handle-callback-err

✓ok
Run (function (err) {
  if (err) throw err
  window.alert (' Done ')
})

✗avoid
Run (function (err) {
  window.alert (' Done ')
})

You must use the browser Global parameter window. prefix except Document,console,navigator eslint:no-undef

Window.alert (' Hi ')   //✓ok

Multiple blank lines are not allowed Eslint:no-multiple-empty-lines

✓ok
var value = ' Hello World '
console.log (value)

✗avoid
var value = ' Hello World '


console.log (value)

When using multiple lines to write ternary expressions,? And: Placed in the owning row eslint: