whitespace rule is incompatible with typescript <= 2.3.0

[otaran]

Bug Report

• TSLint version: 5.4.2
• TypeScript version: 2.2.2
• Running TSLint via: CLI

TypeScript code being linted

const answer=42;

with tslint.json configuration:

{
    "rules": {
        "whitespace": true
    }
}

Actual behavior

const answer=42 is not flagged by tslint, the following warning is reported instead:

Warning: ts.isWhiteSpaceLike is not a function

Expected behavior

const answer=42 should be flagged by tslintwith the following message:

ERROR: test.ts[1,13]: missing whitespace
ERROR: test.ts[1,14]: missing whitespace

Notes

typescript renamed its internal function isWhiteSpace to isWhiteSpaceLike in microsoft/TypeScript@4fa2312 which was released in typescript 2.3.1.

tslint switched to using new name in #2694, but did not provide a fallback code for typescript <= 2.3.0.

5.2.0 is the last working version of tslint.

[ajafff]

space-before-function-paren is also affected.

I wondered why the tests didn't fail...
Since #2425 we're no longer testing with older versions of typescript (currently only 2.3.3 and next). Is that intended @adidahiya @nchen63?
I think there should be tests with 2.1.x and 2.2.x

[adidahiya]

yeah, looks like that slipped under my radar... I agree that we should be testing with 2.2 and maybe 2.1 (if it's not too inconvenient)