code: function processFile(idx, count, filename, data, parsedDeclarations, pluggable) {
    const declarations = parsedDeclarations.files[filename];
    // Inject dependent declaration extraction to last file
    const dependentDeclarations = idx === count - 1 ? parsedDeclarations.dependentDeclarations : [];
    const variables = { global: {} };
  
    const globalDeclarationResultHandler = (declaration, value, sassValue) => {
      if(!variables.global[declaration.declaration]) {
        variables.global[declaration.declaration] = [];
      }
      const variableValue = pluggable.run(Pluggable.POST_VALUE, { value, sassValue }).value;
      variables.global[declaration.declaration].push({ declaration, value: variableValue });
    }
  
    const fileId = getFileId(filename);
    const injection = injectExtractionFunctions(fileId, declarations, dependentDeclarations, { globalDeclarationResultHandler });
    const injectedData = `${data}\n\n${injection.injectedData}`;
    const injectedFunctions = injection.injectedFunctions;
  
    return {
      fileId,
      declarations,
      variables,
      injectedData,
      injectedFunctions,
    };
  }
docs: Process a single sass files to get declarations, injected source and functions