type ConfigName = '.metamaskrc.dist' | '.metamaskprodrc' | '.metamaskrc';
type ConfigInvalidReason = 'symlink' | 'not-regular' | 'unreadable';
type ConfigSource = 'environment' | '.metamaskprodrc' | '.metamaskrc';

type ExtensionInfuraProjectIdResolution =
  | { kind: 'configured'; source: ConfigSource; value: string }
  | { kind: 'not-required' }
  | { kind: 'invalid-file'; name: ConfigName; reason: ConfigInvalidReason }
  | { kind: 'missing'; name: '.metamaskrc' }
  | { kind: 'invalid-value'; source: ConfigSource };

export function readInfuraProjectId(text: string): string | undefined;
export function resolveExtensionInfuraProjectId(
  target: string,
  environment?: NodeJS.ProcessEnv,
): ExtensionInfuraProjectIdResolution;