in lib/h3core.js [1383:1392]
export function directedEdgeToBoundary(edgeIndex, formatAsGeoJson) {
const cellBoundary = C._malloc(SZ_CELLBOUNDARY);
const [lower, upper] = h3IndexToSplitLong(edgeIndex);
try {
throwIfError(H3.directedEdgeToBoundary(lower, upper, cellBoundary));
return readCellBoundary(cellBoundary, formatAsGeoJson);
} finally {
C._free(cellBoundary);
}
}