Access VS Code's theme colors programmatically

extension.ts

import stripJsonComments = require('strip-json-comments'); 

var workbenchSettings = vscode.workspace.getConfiguration("workbench");
        var theme = workbenchSettings.colorTheme;
        var themePath = null;

        var extension = vscode.extensions.all.find(x => {
            var extensionTheme = x.packageJSON.contributes.themes && x.packageJSON.contributes.themes.find(y => {
                return y.label === theme;
            });

            if (extensionTheme != null)  {
                themePath = extensionTheme.path;
                return true;
            }

            return false;
        });

        themePath = path.join(extension.extensionPath, themePath);

        fs.readFile(themePath,  (error, data) => {
            var themeInfo = JSON.parse(stripJsonComments(data.toString()));
        })