How to parse a TypeScript code base into ASTs - parsing

Question

I want to parse TypeScript projects into ASTs.
I can parse single file by :
import ts = require("typescript");
var fs = require('fs');
var util = require('util');
const ast = ts.createSourceFile('sample.ts', fs.readFileSync('sample.ts').toString(), ts.ScriptTarget.ES6, true);
console.log("AST:"+util.inspect(ast));
I can even loop through the files and filter files by extension and run above code to generate ASt.
However I want to parse the whole project in such a way that the relationships (like imports) will be preserved in AST.
For example:
If, a.ts is referencing var x from b.ts as below:
a.ts:
var y = x;
b.ts:
var x = 5;
In this case signature of x in a .ts should be resolved as : b.ts.x or equivalent.
I just want all such relationships resolved in the ASts as I parse the .ts files one by one.

Answer 1

You can load your project using
ts.createProgram(rootNames: string[], options: CompilerOptions, host?: CompilerHost, oldProgram?: Program)
rootNames is the list of all typescript files in your project. As far as I know, unless you declare type explicitly, AST will have no reference to it.
for eg. If you have
class MyClass {
// some code
}
let instance1 = new MyClass();
let instance2: MyClass = new MyClass();
In AST, node for instance1 will have type property as undefined, for instance2 type property will have proper TypeReference
For type checking you can use Program.getTypeChecker(). This returns a TypeChecker which can be used to analyse files in the program.