/// <reference path="node-sass.d.ts" />
import sass = require('node-sass');
sass.render({
  file: '/path/to/myFile.scss',
  data: 'body{background:blue; a{color:black;}}',
  importer: function(url, prev, done) {
    // url is the path in import as is, which libsass encountered.
    // prev is the previously resolved path.
    // done is an optional callback, either consume it or return value synchronously.
    // this.options contains this options hash, this.callback contains the node-style callback
    someAsyncFunction(url, prev, function(result) {
      done({
        file: result.path, // only one of them is required, see section Sepcial Behaviours.
        contents: result.data
      });
    });
    // OR
    var result = someSyncFunction(url, prev);
    return { file: result.path, contents: result.data };
  },
  includePaths: ['lib/', 'mod/'],
  outputStyle: 'compressed'
}, function(error, result) { // node-style callback from v3.0.0 onwards
  if (error) {
    console.log(error.status); // used to be "code" in v2x and below
    console.log(error.column);
    console.log(error.message);
    console.log(error.line);
  }
  else {
    console.log(result.css.toString());

    console.log(result.stats);

    console.log(result.map.toString());
    // or better
    console.log(JSON.stringify(result.map)); // note, JSON.stringify accepts Buffer too
  }
});
// OR
var result = sass.renderSync({
  file: '/path/to/file.scss',
  data: 'body{background:blue; a{color:black;}}',
  outputStyle: 'compressed',
  outFile: '/to/my/output.css',
  sourceMap: true, // or an absolute or relative (to outFile) path
  importer: function(url, prev, done) {
    // url is the path in import as is, which libsass encountered.
    // prev is the previously resolved path.
    // done is an optional callback, either consume it or return value synchronously.
    // this.options contains this options hash
    someAsyncFunction(url, prev, function(result) {
      done({
        file: result.path, // only one of them is required, see section Sepcial Behaviours.
        contents: result.data
      });
    });
    // OR
    var result = someSyncFunction(url, prev);
    return { file: result.path, contents: result.data };
  },
});

console.log(result.css);
console.log(result.map);
console.log(result.stats);

function someAsyncFunction(url: string, prev: string, callback: (result: { path: string; data: string }) => void): void {}
function someSyncFunction(url: string, prev: string): { path: string; data: string} {
  return null;
}