Function computeFlowField

computeFlowField(
    goals: HexCoord | readonly HexCoord[],
    costFn: MoveCostFn,
    map: { width: number; height: number },
    opts?: FlowFieldOptions,
): FlowField
Builds a FlowField over map in one call.

Convenience for one-off fields. When the destination changes every turn or every frame, construct a FlowField once and call FlowField.compute on it instead — that path reuses its buffers.
Parameters
- goals: HexCoord | readonly HexCoord[]
- costFn: MoveCostFn
- map: { width: number; height: number }
- opts: FlowFieldOptions = {}
Returns FlowField
Example
```
const field = computeFlowField(offsetToHex(goalCol, goalRow), moveCost, map);
for (const unit of army) {
  const path = field.path(offsetToHex(unit.col, unit.row));
  if (path && path.length > 1) unit.travel(path);
}
```
- Defined in pathfinding/FlowField.ts:408