| UI | |
| 1 (Type/Class) | Yi.UI.Common |
| 2 (Data Constructor) | Yi.UI.Common |
| UIBoot | Yi.Types, Yi.Config, Yi |
| UIConfig | |
| 1 (Type/Class) | Yi.Types, Yi.Config, Yi.Config.Simple, Yi |
| 2 (Data Constructor) | Yi.Types, Yi.Config, Yi |
| UIStyle | |
| 1 (Data Constructor) | Yi.Config.Simple, Yi |
| 2 (Type/Class) | Yi.Config.Simple, Yi |
| UIUpdate | Yi.Buffer, Yi.Config.Simple, Yi |
| unCompletionTree | Yi.CompletionTree |
| underline | Yi.Config.Simple, Yi |
| undoB | Yi.Buffer.Misc, Yi.Buffer, Yi.Config.Simple, Yi |
| undos | Yi.Types |
| undosA | Yi.Buffer.Misc, Yi.Buffer, Yi.Config.Simple, Yi |
| undoU | Yi.Buffer.Undo, Yi.Buffer, Yi.Config.Simple, Yi |
| unionRegion | Yi.Buffer.Region, Yi.Buffer, Yi.Config.Simple, Yi |
| uniplate | Yi.Syntax.Tree |
| unitDelimited | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitEmacsParagraph | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitParagraph | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitSentence | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitSep | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitSepThisLine | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitViWORD | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitViWord | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitViWORDAnyBnd | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitViWordAnyBnd | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitViWORDOnLine | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitViWordOnLine | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitWiseRegion | Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unitWord | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unLineCommentSelectionB | Yi.Buffer.HighLevel, Yi.Buffer, Yi.Config.Simple, Yi |
| unlines' | Yi.String |
| unsafeWithEditor | Yi.Types, Yi.Keymap, Yi.Config.Simple, Yi |
| unTag' | Yi.Tag |
| untilB | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| untilB_ | Yi.Buffer.TextUnit, Yi.Buffer.Normal, Yi.Buffer, Yi.Config.Simple, Yi |
| unWindowRef | Yi.Buffer, Yi.Config.Simple, Yi |
| unzipFM | Yi.Syntax.Driver |
| Update | Yi.Buffer, Yi.Config.Simple, Yi |
| update | Yi.CompletionTree |
| updateDirection | Yi.Buffer, Yi.Config.Simple, Yi |
| updateIsDelete | Yi.Buffer, Yi.Config.Simple, Yi |
| updatePoint | Yi.Buffer, Yi.Config.Simple, Yi |
| updateStream | Yi.Types |
| updateTransactionAccum | Yi.Types |
| updateTransactionInFlight | Yi.Types |
| upFromBosB | Yi.Buffer.HighLevel, Yi.Buffer, Yi.Config.Simple, Yi |
| uppercaseWordB | Yi.Buffer.HighLevel, Yi.Buffer, Yi.Config.Simple, Yi |
| upScreenB | Yi.Buffer.HighLevel, Yi.Buffer, Yi.Config.Simple, Yi |
| upScreensB | Yi.Buffer.HighLevel, Yi.Buffer, Yi.Config.Simple, Yi |
| URList | Yi.Buffer.Undo, Yi.Buffer, Yi.Config.Simple, Yi |
| userForceRefresh | |
| 1 (Function) | Yi.UI.Common |
| 2 (Function) | Yi.Core, Yi.Config.Simple, Yi |
| userToCanonPath | System.FriendlyPath |
| uses | Yi.Monad |