SingleSourceOfTruth [rule] v0.1.0

Every value that drives the UI lives in exactly one place — a ViewModel, a remembered state holder, or a state-hoisted parameter. Composables read it and emit it. They do NOT copy it into a second remember { mutableStateOf(...) } they then keep in sync with the original via LaunchedEffect. Two copies of the same fact will drift the moment the synchronisation code has a bug, and you cannot tell which is correct.

Checks

• No LaunchedEffect(externalValue) { internalState = externalValue } patterns — that is a duplicated source of truth.
• Forms read directly from the ViewModel state object; they do not snapshot it into a local copy at composition time.
• When a composable needs a derived value from another value, use derivedStateOf or compute it directly — do not store the derived result.
• Selection, scroll, and focus state belong to a hoisted state holder (e.g. LazyListState, TextFieldState), used by both reader and writer.

Label

Each piece of state has exactly one owner; UI reads, never duplicates

SingleSourceOfTruth [rule] v0.1.0

Every value that drives the UI lives in exactly one place — a ViewModel, a remembered state holder, or a state-hoisted parameter. Composables read it and emit it. They do NOT copy it into a second remember { mutableStateOf(...) } they then keep in sync with the original via LaunchedEffect. Two copies of the same fact will drift the moment the synchronisation code has a bug, and you cannot tell which is correct.

Checks

• No LaunchedEffect(externalValue) { internalState = externalValue } patterns — that is a duplicated source of truth.
• Forms read directly from the ViewModel state object; they do not snapshot it into a local copy at composition time.
• When a composable needs a derived value from another value, use derivedStateOf or compute it directly — do not store the derived result.
• Selection, scroll, and focus state belong to a hoisted state holder (e.g. LazyListState, TextFieldState), used by both reader and writer.

Label

Each piece of state has exactly one owner; UI reads, never duplicates

Label

Each piece of state has exactly one owner; UI reads, never duplicates