make
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Devtools
Invariant
Named world checks evaluated after every frame of a session run.
A check returns a message describing the violation, or undefined when the invariant holds. Read the world through runtime.inspect(...) with a Game.Inspector, so the check stays typed and read-only.
Examples
const PlayerInsideWorld = Invariant.make("player inside world", () => {
for (const position of runtime.inspect(PlayerPositions)) {
if (position.x < 0 || position.x > WORLD_WIDTH) return `player at x=${position.x}`
}
return undefined
})