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Pro Adds support for object-oriented programming
Typescript enables familiar object-oriented programming patterns: classes, inheritance, public/private methods and properties, et cetera.
Pro Strict superset of Javascript
Every existing Javascript program is already a valid TypeScript program giving it the best support for existing libraries, which is particularly useful if you need to integrate with an existing Javascript code base.
Pro Polyfill for ES6 fat-arrow syntax
Typescript implements the fat arrow syntax, which always maintains the current context for this and is a shorter/more convenient syntax than traditional function definition.
Con Type inference coverage is incomplete
The default type when declaring and using a variable is any. For example, the following should break but does not: function add(a:number) { return a + 1 }function addAB(a, b) {return add(a) + b}addAB("this should break but doesn't :(", 100) In order to avoid this, you have to dec...
Con Unversioned community type definitions
It can be difficult to find type annotations for older versions of different libraries because community type definitions are not versioned.
Pro Checks to see if you check for Nulls
Because getting those exceptions is just not fun and very pervasive.
Con Weak base type definitions even for popular JavaScript libraries
For example, there are definitions for Gulp, React.
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