Exclude semicolon is a bad practice or not

[ufocoder]

I use standard and I have the following code:

const a = 'methodA'
const b = 'methodB'

class MyClass {
  [a] = () => (5 * 7)
  [b] = () => (5 * 10)
}

Of course, it will be compiled not correct. Try it online through REPL

There's the correct code:

const a = 'methodA'
const b = 'methodB'

class MyClass {
  [a] = () => (5 * 7);
  [b] = () => (5 * 10)
}

Standard allow us not to write semicolons, but sometimes it required. How I should resolve this situation more elegantly?

[rstacruz]

Never start a line with (, [, or `. This is the only gotcha with omitting semicolons, and standard protects you from this potential issue.
eslint: no-unexpected-multiline

See the no-unexpected-multiline rule for a list of violations it'll catch.

[rstacruz]

Usually prefixing the line with ; or void would fix it. In your case, it'll have to be ;.

// Bad
window.a = 2
(function () {})()

// OK
window.a = 2
;(function () {})()

// Also OK
window.a = 2
void (function () {})()

[feross]

When omitting semicolons, the only rule to remember is never start a line with (, [ or `. When you must, you can prefix that line with a semicolon.

const a = 'methodA'
const b = 'methodB'

class MyClass {
  [a] = () => (5 * 7)
  ;[b] = () => (5 * 10)
}

It looks a bit silly at first, but you quickly get used to it.