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import type { FlightRouterState } from '../../../server/app-render/types'
export function isNavigatingToNewRootLayout(
currentTree: FlightRouterState,
nextTree: FlightRouterState
): boolean {
// Compare segments
const currentTreeSegment = currentTree[0]
const nextTreeSegment = nextTree[0]
// If any segment is different before we find the root layout, the root layout has changed.
// E.g. /same/(group1)/layout.js -> /same/(group2)/layout.js
// First segment is 'same' for both, keep looking. (group1) changed to (group2) before the root layout was found, it must have changed.
if (Array.isArray(currentTreeSegment) && Array.isArray(nextTreeSegment)) {
// Compare dynamic param name and type but ignore the value, different values would not affect the current root layout
// /[name] - /slug1 and /slug2, both values (slug1 & slug2) still has the same layout /[name]/layout.js
if (
currentTreeSegment[0] !== nextTreeSegment[0] ||
currentTreeSegment[2] !== nextTreeSegment[2]
) {
return true
}
} else if (currentTreeSegment !== nextTreeSegment) {
return true
}
// Current tree root layout found
if (currentTree[4]) {
// If the next tree doesn't have the root layout flag, it must have changed.
return !nextTree[4]
}
// Current tree didn't have its root layout here, must have changed.
if (nextTree[4]) {
return true
}
// We can't assume it's `parallelRoutes.children` here in case the root layout is `app/@something/layout.js`
// But it's not possible to be more than one parallelRoutes before the root layout is found
// TODO-APP: change to traverse all parallel routes
const currentTreeChild = Object.values(currentTree[1])[0]
const nextTreeChild = Object.values(nextTree[1])[0]
if (!currentTreeChild || !nextTreeChild) return true
return isNavigatingToNewRootLayout(currentTreeChild, nextTreeChild)
}
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