function resolveConflict()

in src/snippet-dependencies.ts [98:142]

• 28 lines of code
• 9 McCabe index (conditional complexity)

function resolveConflict(
  name: string,
  a: CompilationDependency,
  b: CompilationDependency | undefined,
): CompilationDependency {
  if (!b) {
    return a;
  }

  if (a.type === 'concrete' && b.type === 'concrete') {
    if (b.resolvedDirectory !== a.resolvedDirectory) {
      throw new Error(`Dependency conflict: ${name} can be either ${a.resolvedDirectory} or ${b.resolvedDirectory}`);
    }
    return a;
  }

  if (a.type === 'symbolic' && b.type === 'symbolic') {
    // Intersect the ranges
    return {
      type: 'symbolic',
      versionRange: myVersionIntersect(a.versionRange, b.versionRange),
    };
  }

  if (a.type === 'concrete' && b.type === 'symbolic') {
    const concreteVersion: string = JSON.parse(
      fs.readFileSync(path.join(a.resolvedDirectory, 'package.json'), 'utf-8'),
    ).version;

    if (!semver.satisfies(concreteVersion, b.versionRange, { includePrerelease: true })) {
      throw new Error(
        `Dependency conflict: ${name} expected to match ${b.versionRange} but found ${concreteVersion} at ${a.resolvedDirectory}`,
      );
    }

    return a;
  }

  if (a.type === 'symbolic' && b.type === 'concrete') {
    // Reverse roles so we fall into the previous case
    return resolveConflict(name, b, a);
  }

  throw new Error('Cases should have been exhaustive');
}