Function convertToBitFlags

packages/core/src/di/injector_compatibility.ts:300–315

(
  flags: InjectOptions | InternalInjectFlags | undefined,
)

// Converts object-based DI flags (`InjectOptions`) to bit flags (`InjectFlags`).
export function convertToBitFlags(
  flags: InjectOptions | InternalInjectFlags | undefined,
): InternalInjectFlags | undefined {
  if (typeof flags === 'undefined' || typeof flags === 'number') {
    return flags;
  }

  // While TypeScript doesn't accept it without a cast, bitwise OR with false-y values in
  // JavaScript is a no-op. We can use that for a very codesize-efficient conversion from
  // `InjectOptions` to `InjectFlags`.
  return (InternalInjectFlags.Default | // comment to force a line break in the formatter
    ((flags.optional && InternalInjectFlags.Optional) as number) |
    ((flags.host && InternalInjectFlags.Host) as number) |
    ((flags.self && InternalInjectFlags.Self) as number) |
    ((flags.skipSelf && InternalInjectFlags.SkipSelf) as number)) as InternalInjectFlags;
}

// Converts bitflags to inject options
function convertToInjectOptions(flags: InternalInjectFlags): InjectOptions {