WIP - adding typescript

[richgilbank]

Work in progress - This is not yet complete, as the error handling seems to be a little difficult (TypeScript seems to not be throwing SyntaxErrors, or anything else, when encountering broken syntax). Anyone more familiar with TypeScript's compiler who could lend a hand?
cc @yashprit or @hi104, who's already done great work on the TypeScript Playground on Ace

Ref: #35

[aluanhaddad]

@richgilbank Cool project! The reason no errors are being reported is because you have not set reportDiagnostics: true. This will cause the compiler to populate the diagnosticsproperty ofresult`.
Here is a simple example.

const source = "let x: stri ng  = 'string'";

const result = ts.transpileModule(source, {
    reportDiagnostics: true
});

result.diagnostics
    .filter(diagnostic => diagnostic.category === 1) // error
    .map(diagnostic => typeof diagnostic.messageText === 'string' 
        ? diagnostic.messageText
        : diagnostic.messageText.messageText)
    .forEach(message => console.error(message));
// '=' expected.

[richgilbank]

Sorry for the incredibly slow response on this. Would like to get this up and running soon - should be able to find some time to work on it in the next little while. Thanks for the note @aluanhaddad, will take a look! Alternatively, feel free to submit a PR :)