add linting (and some initial fixes)

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+# Change Log
+
+## v2.2.0
+**Bugfixes:**
+* Fixed bit value of `SideEffectOptions.JsxElement` to be a power of 2
+
+**Features:**
+* Added utilities: `getTokenAtPosition` and `isPositionInComment`
+
+## v2.1.0
+**Features:**
+* Added typeguard `isExpression`
+* Added utilities: `hasSideEffects`, `getDeclarationOfBindingElement`
+
+## v2.0.0
+**Breaking Changes:**
+* Dropped compatibility with `typescript@<2.1.0`
+* Removed misnamed `isNumericliteral`, use `isNumericLiteral` instead (notice the uppercase L)
+* Removed `isEnumLiteralType` which will cause compile errors with typescript@2.4.0
+* Refactored directory structure: all imports that referenced subdirectories (e.g. `require('tsutils/src/typeguard')` will be broken
+
+**Features:**
+* New directory structure allows imports of typeguards or utils independently, e.g. (`require('tsutils/typeguard')`)
+
+## v1.9.1
+**Bugfixes:**
+* `isObjectFlagSet` now uses the correct `objectFlags` property
+
+## v1.9.0
+**Bugfixes:**
+* `getNextToken` no longer omits `EndOfFileToken` when there is no trivia before EOF. That means the only inputs where `getNextToken` returns `undefined` are `SourceFile` and `EndOfFileToken`
+
+**Features**:
+* Added typeguards for types
+* Added utilities for flag checking: `isNodeFlagSet`, `isTypeFlagSet`, `isSymbolFlagSet`,`isObjectFlagSet`, `isModifierFlagSet` 
+
+## v1.8.0
+**Features:**
+* Support peer dependency of typescript nightlies of 2.4.0
+* Added typeguards: `isJsxAttributes`, `isIntersectionTypeNode`, `isTypeOperatorNode`, `isTypePredicateNode`, `isTypeQueryNode`, `isUnionTypeNode`
+
+## v1.7.0
+**Bugfixes:**
+* `isFunctionScopeBoundary` now handles Interfaces, TypeAliases, FunctionSignatures, etc
+
+**Features:**
+* Added utilities: `isThisParameter`, `isSameLine` and `isFunctionWithBody`
+
+## v1.6.0
+**Features:**
+* Add `isValidPropertyAccess`, `isValidNumericLiteral` and `isValidPropertyName`
+
+## v1.5.0
+**Features:**
+* Add `isValidIdentifier`
+
+## v1.4.0
+**Features:**
+* Add `contentLength` property to the result of `getLineRanges`
+
+## v1.3.0
+**Bugfixes:**
+* canHaveLeadingTrivia:
+  * Fix property access on undefined parent reference
+  * Fixes: https://github.com/palantir/tslint/issues/2330
+* hasOwnThisReference: now includes accessors on object literals
+
+**Features:**
+* Typeguards:
+  * isTypeParameterDeclaration
+  * isEnitityName
+
+## v1.2.2
+**Bugfixes:**
+* hasOwnThisReference:
+  * exclude overload signatures of function declarations
+  * add method declarations on object literals
+
+## v1.2.1
+**Bugfixes:**
+* Fix name of isNumericLiteral
+
+## v1.2.0
+**Features:**
+* Typeguards:
+  * isEnumMember
+  * isExpressionWithTypeArguments
+  * isImportSpecifier
+* Utilities:
+  * isJsDocKind, isTypeNodeKind
+* Allow typescript@next in peerDependencies
+
+## v1.1.0
+**Bugfixes:**
+* Fix isBlockScopeBoundary: Remove WithStatement, IfStatment, DoStatement and WhileStatement because they are no scope boundary whitout a block.
+
+**Features:**
+* Added more typeguards:
+  * isAssertionExpression
+  * isEmptyStatement
+  * isJsxAttributeLike
+  * isJsxOpeningLikeElement
+  * isNonNullExpression
+  * isSyntaxList
+* Utilities:
+  * getNextToken, getPreviousToken
+  * hasOwnThisReference
+  * getLineRanges
+
+
+## v1.0.0
+**Features:**
+
+* Initial implementation of typeguards
+* Utilities:
+  * getChildOfKind
+  * isNodeKind, isAssignmentKind
+  * hasModifier, isParameterProperty, hasAccessModifier
+  * getPreviousStatement, getNextStatement
+  * getPropertyName
+  * forEachDestructuringIdentifier, forEachDeclaredVariable
+  * getVariableDeclarationKind, isBlockScopedVariableDeclarationList, isBlockScopedVariableDeclaration
+  * isScopeBoundary, isFunctionScopeBoundary, isBlockScopeBoundary
+  * forEachToken, forEachTokenWithTrivia, forEachComment
+  * endsControlFlow
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