Rule to limit variable statements to a single declaration

[DanielRosenwasser]

It would be nice if we could disallow the following in our codebase:

var x: string, y: number;

[ashwinr]

to clairfy: do you mean disallow multiple variable definitions in the same statement?

[DanielRosenwasser]

Yup, sorry about that. It was fairly late.

[adidahiya]

Looks like the corresponding eslint rule for this is called one-var: http://eslint.org/docs/rules/one-var

[ashwinr]

👍

[YuichiNukiyama]

related PR: #1194

[jkillian]

Decided not to go with one-var as it's a somewhat brief name, instead we'll use no-multiple-variable-declaration, which fits TSLint's style better hopefully. Thanks to @YuichiNukiyama for implementing this! It'll be around in the next release. (Still up for renaming things if people feel strongly about it one way or the other)

[jkillian]

Actually, I think no-multiple-variable-declaration is ambiguous in which style it's actually disallowing. Now thinking about one-variable-per-declaration instead