According to log of TsLint which bundled in WebEssentials we should use double quoted string literals:
```
3/8/2014 11:00:33 AM: TsLint: app.ts compilation failed: TsLint: ' should be "
```
It just a warning and has no effect on build process.
```
3/8/2014 11:00:33 AM: TsLint: app.ts compilation failed: TsLint: ' should be "
```
It just a warning and has no effect on build process.