Function resolveSourceType

resolveSourceType(filename: string, declared?: string): string
Picks the Polygon sourceType for a file: the value declared in Config.json wins; otherwise it is inferred from the extension.
Parameters
- filename: string
  File name (extension decides the fallback)
- Optionaldeclared: string
  sourceType from the config entry, if any
Returns string
Polygon compiler identifier (e.g. cpp.gcc14-64-msys2-g++23)
Example
```
resolveSourceType('sol.cc');                              // 'cpp.g++17'
resolveSourceType('sol.cpp', 'cpp.gcc14-64-msys2-g++23'); // declared wins
resolveSourceType('Sol.java');                            // 'java11'
```
- Defined in helpers/remote/pushing.ts:33