Update tslint to the latest version 🚀

Version 5.0.0 of tslint just got published.

Dependency	tslint
Current Version	4.5.1
Type	devDependency

The version 5.0.0 is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of tslint. Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Release Notes

v5.0.0

🔥 Breaking changes

Minimum version of TypeScript version is now 2.1.0 (#2425)
The severity level of rules are now configurable and defaults to severity "error". This affects the output of formatters:
- [formatter] msbuild was outputting all failures as "warning".
- [formatter] pmd was outputting all failures as priority 1. Now, it uses priority 3 for "error" (default) and priority 4 for "warning"
[formatter] json changed the fix property to now contain either one replacement or an array of replacements (#2403)
tslint:recommended configuration updated with tslint:latest rules & options (#2424)
Removed no-unused-new rule, with logic moved into no-unused-expression (#2269)
no-trailing-whitespace now checks template strings by default. Use the new options ignore-template-strings to restore the old behavior. (#2359)

API breaks for custom rules

Removed method skip from RuleWalker (#2313)
Removed all use of the TypeScript Language Service, use only Program APIs instead (#2235)
- This means that some rules that previously worked without the type checker now require it. This includes:
  - no-unused-variable
  - no-use-before-declare
- This breaks custom rule compilation. If your rule was not using the ts.LanguageService APIs, the migration is quite simple:
```
- public applyWithProgram(srcFile: ts.SourceFile, langSvc: ts.LanguageService): Lint.RuleFailure[] {
-     return this.applyWithWalker(new Walker(srcFile, this.getOptions(), langSvc.getProgram()));
+ public applyWithProgram(srcFile: ts.SourceFile, program: ts.Program): Lint.RuleFailure[] {
+     return this.applyWithWalker(new Walker(srcFile, this.getOptions(), program));
```
- N.B. If you are refactoring your custom rules, consider these performance tips for writing custom rules.
Removed createFix. Replacements should be passed directly into addFailure. (#2403)
Removed deprecated scanAllTokens and skippableTokenAwareRuleWalker (#2370)

🎉 Notable features & enhancements

[feature] The severity level of rules are now individually configurable. Default severity can also be configured. (#629, #345)

Valid values for severity: default | error | warn | warning | none | off
Valid values for defaultSeverity: error | warn | warning | none | off
Old style:

{
    "extends": "tslint:latest",
    "rules": {
        "callable-types": true,
        "max-line-length": [true, 140]
    }
}

New style (in this example, callable-types outputs errors and max-line-length outputs warnings):

{
    "extends": "tslint:latest",
    "defaultSeverity": "error",
    "rules": {
        "callable-types": true,
        "max-line-length": {
            "options": 140,
            "severity": "warning"
        }
    }
}

[new-rule] prefer-template (#2243)
[new-rule] return-undefined (#2251)
[new-rule] no-reference-import (#2273)
[new-rule] no-unnecessary-callback-wrapper (#2249)
[new-fixer] linebreak-style (#2394)
[new-fixer] eofline (#2393)

Full list of changes

[api] Added class OptionallyTypedRule, which allows rule authors to write a rule that applies when typing is either enabled or disabled (#2300)
[bugfix] prefer-function-over-method now ignores abstract methods (#2307)
[bugfix] arrow-parens with option ban-single-arg-parens now correctly handles functions with return type annotation (#2265)
[bugfix] prefer-function-over-method exclude overload signatures (#2315)
[bugfix] use-isnan now applies only to comparison operators (#2317)
[bugfix] file-header-rule now handles single-line comments correctly (#2320)
[bugfix] newline-before-return: fix handling of blank lines between comments (#2321)
[bugfix] trailing-comma No longer enforce trailing commas in type parameters and tuple types (#2236)
[bugfix] align don't fix if it would remove code (#2379)
[bugfix] unified-signatures now recognizes rest parameters (#2342)
[bugfix] no-inferrable-types don't warn for inferrable type on readonly property (#2312)
[bugfix] trailing-comma no longer crashes on new without parentheses (e.g. new Foo) (#2389)
[bugfix] semicolon Ignore comments when checking for unnecessary semicolon (#2240)
[bugfix] semicolon Don't report unnecessary semicolon when followed by regex literal (#2240)
[bugfix] CLI: exit with 0 on type check errors when --force is specified (#2322)
[bugfix] CLI: --test now correctly strips single quotes from patterns on windows (#2322)
[bugfix] prefer-const only fix initialized variables (#2219)
[bugfix] prefer-const correctly handle variables shadowed by parameters and catched exceptions (#2219)
[bugfix] prefer-const don't warn if one variable in a for loop initializer can not be const (#2219)
[bugfix] prefer-const handle more cases in destructuring (#2219)
[bugfix] no-unused-expression allow comma separated assignments (#2269)
[chore] removed update-notifier dependency (#2262)
[development] allow rule tests to specify version requirement for typescript (#2323)
[enhancement] ignore-properties option of no-inferrable-types now also ignores parameter properties (#2312)
[enhancement] unified-signatures now displays line number of the overload to unify if there are more than 2 overloads (#2270)
[enhancement] trailing-comma New checks for CallSignature and NamedExports (#2236)
[enhancement] semicolon New check for export statements, function overloads and shorthand module declaration (#2240)
[enhancement] semicolon Report unnecessary semicolons in classes and in statement position (for option "always" too) (#2240)
[enhancement] semicolon check for semicolon after method overload (#2240)
[enhancement] array-type now consider object, undefined and never as simple types, allowing object, undefined[] and never[] (#1843)(#2353)
[enhancement] align check statement alignment for all blocks (#2379)
[enhancement] aligncheck parameter alignment for all signatures (#2379)
[enhancement] --test can handle multiple paths at once (#2322)
[enhancement] only-arrow-functions allow functions that use this in the body (#2229)
[enhancement] CLI: print error when --type-check is used without --project (#2322)
[enhancement] CLI: don't print stack trace on type check error (#2322)
[enhancement] CLI: added -p as shorthand for --project to be consistent with tsc (#2322)
[enhancement] prefer-const show warnings for var (#2219)
[enhancement] quotemark fixer unescapes original quotemark (e.g. '\'' -> "'") (#2359)
[enhancement] no-unused-expression allow indirect eval (0, eval)(""); (#2269)
[enhancement] no-unused-expression checking for unused new can now use option allow-fast-null-checks (#2269)
[enhancement] no-unused-expression find unused comma separated expressions in all locations of the code (#2269)
[enhancement] no-unused-expression find unused expressions inside void expression (#2269)
[new-config-option] Adds defaultSeverity with options error, warning, and off. (#2416)
[new-formatter] TAP formatter (#2325)
[new-rule-option] no-unused-expression adds option allow-tagged-template to allow tagged templates for side effects (#2269)
[new-rule-option] no-unused-expression adds option allow-new to allow new without using the new object (#2269)
[new-rule-option] member-access adds no-public option (#2247)
[new-rule-option] curly added option ignore-same-line (#2334)
[new-rule-option] {destructuring: "all"} to only warn if all variables in a destructuring can be const (#2219)
[new-rule-option] added ignore-template-strings to no-trailing-whitespace (#2359)
[rule-update] array-type now consider undefined and never as simple types, allowing undefined[] and never[] (#1843)

Thanks to our contributors!

Brian Olore
Andy Hanson
@andy-ms
Chris Barr
Klaus Meinhardt
@bumbleblym
Josh Goldberg
James Clark
@vilic
Aleksandr Filatov
Matt Banz
Karol Janyst
Mike Deverell
Alexander James Phillips
Irfan Hudda

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molecuel / core