Need way to specify min TS version for a test

[nchen63]

#2219 fails on ts 2.0.10 because spread isn't supported, so we need a way to disable tests for certain versions.

One way to do this might be to have a config setting that specifies the min version number. I think a more flexible approach would be to throw a special Error if an unsupported construct is detected when the rule is executed. These errors would cause the rule test runner to ignore that test. We would also need a way to ensure that the Error is expected, maybe a new property of the config file.

[adidahiya]

maybe we just drop 2.0.10 in v5...

[ajafff]

+1 for dropping ts 2.0, but the problem still remains for rules that use new language features / syntax

#2219 fails because typescript just doesn't properly parse code with object spread. I don't think the rule itself can do anything special with the AST to detect such cases. I also would not go the route of adding more stuff to the config file.

Rule tests already use their own syntax for expected failures. Why not simply add a directive with a semver selector at the top of the *.ts.lint file. Something like [typescript]: >=2.1.0 (which is actually fully compatible with the current syntax)