typescript compiling (in terms of Java compiling)

Question

I'm considering using TypeScript instead of JavaScript for a very big project. The question is: what are the benefits I can gain. TypeScript provides interfaces, strict typing and so on. But the thing that is the most important is whether TypeScript is compiled. By compilation I mean a real compilation just like Java has. I don't need JavaScript's minification (uglification, etc. - some people call it compiling). I don't mean Python's compilation as well.

So the question is: will TypeScript throw an error at compile-time if a developer makes a mistake before runtime, just as Java would?

SLaks · Accepted Answer · 2015-02-12 19:56:27Z

4

Yes.

The whole point of Typescript is compile-time type checking.

answered Feb 12, 2015 at 19:56

SLaks

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ssube · Accepted Answer · 2015-02-12 19:57:57Z

1

Typescript introduces a compile-time type checking system, which can warn you about errors before runtime.

TS does not compile into a binary representation like Java, it simply transpiles into Javascript which is later interpreted (or compiled) and run by the browser.

What Typescript does offer, of particular value for large codebases, is essentially a layer of static analysis prior to runtime. In TS' case, that's centered around publishing type expectations and the contracts those types provide, then verifying they are met from all visible code.

answered Feb 12, 2015 at 19:57

ssube

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2 Comments

ducin Over a year ago

Eventually, I wanna write a single-page app (based on angular, if that makes any difference). The code would be transpiled into javascript and executed as so in the browser. So may I assume that any compile-time errors would be thrown on transpilation (called by npmjs.com/package/grunt-typescript)?

ssube Over a year ago

Yes, TSC (the compiler) prints any type errors it encounters as it transpiles the files in JS. You can (and at work I do) use this to fail the build, just as if it were a compile error in some other language.

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