Never start a line with ` because of tagged template strings

[gyson]

because

let x = () => {}

`hello`

console.log(x)

will output

undefined

(tested with nodejs v4.1.0)

[rstacruz]

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings#Tagged_template_strings

[feross]

Issue opened on eslint: eslint/eslint#4169

[feross]

Turns out this is a bug in V8. See the bug I filed here: https://code.google.com/p/v8/issues/detail?id=4497

A semicolon should automatically be inserted by the JS engine. The fact that it isn't in node v4 is a bug. Fortunately, the V8 developers say it's fixed in master so it'll make it's way to node soon enough.

Mystery solved. We don't need to detect this case in standard.

[gyson]

Thanks for your clarification.

Just one more question:

Would this case

let x = () => {}
let y = x
`hello`

be parsed to

let x = () => {};
let y = x`hello`;

or

let x = () => {};
let y = x;
`hello`;

?

[feross]

@gyson I think it will actually be parsed to the first one. :( Fortunately, the eslint developers are aware and plan to improve the rule: eslint/eslint#4169 (comment)

[gyson]

@feross I see. Thanks.