Typescript project compile errors - node.js

Question

I am starting with typescript and installed the typing files for node and express,body-parser. When i try to run compile , but on compiling I see the errors that it cannot import express and body parser. But I also installed the node modules separately for all of them so after tsc compiles the code it would run fine . But the compilation errors are still there.
The Errors
app.ts(2,26): error TS2307: Cannot find module 'express'.
app.ts(9,12): error TS2304: Cannot find name 'process'.
import express = require('express');
let app = express();
app.get('/',(req,res)=>{
res.send("Hello");
})
// Listen for HTTP traffic
app.listen(process.env.PORT || 3000);

Answer 1

code it would run fine
TypeScript is like a really powerful linter. It will always try to give you JavaScript even in the presence of type errors. So your code might run fine even with errors.
More
https://basarat.gitbooks.io/typescript/content/docs/why-typescript.html
But the compilation errors are still there.
I cannot help you much without you sharing more code / steps you took?
Samples
This project uses express : https://github.com/alm-tools/alm
Also docs on a quickstart : https://basarat.gitbooks.io/typescript/content/docs/quick/nodejs.html

Answer 2

So , first mistake with my code i found was that i my app.ts i was not referencing the main.d.ts file.
/// <reference path="typings/main.d.ts" />
then still the errors were coming .
so installed typings for the following.
typings install serve-static --ambient --save
typings install express-serve-static-core --ambient --save
typings install mime --ambient --save
and voila, no compile errors