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Fix @turf/line-offset's return type regression #3009

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Merged
smallsaucepan merged 1 commit into from
Jan 27, 2026
Merged

Fix @turf/line-offset's return type regression #3009

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6 changes: 3 additions & 3 deletions packages/turf-line-offset/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,7 @@ function lineOffset<T extends LineString | MultiLineString>(
geojson: Feature<T> | T,
distance: number,
options: { units?: Units } = {}
) {
): Feature<T> {
// Optional parameters
options = options || {};
if (!isObject(options)) throw new Error("options is invalid");
Expand All @@ -48,15 +48,15 @@ function lineOffset<T extends LineString | MultiLineString>(

switch (type) {
case "LineString":
return lineOffsetFeature(geojson, distance, units);
return lineOffsetFeature(geojson, distance, units) as Feature<T>;
case "MultiLineString":
var coords: Position[][] = [];
flattenEach(geojson, function (feature) {
coords.push(
lineOffsetFeature(feature, distance, units).geometry.coordinates
);
});
return multiLineString(coords, properties);
return multiLineString(coords, properties) as Feature<T>;
default:
throw new Error("geometry " + type + " is not supported");
}
Expand Down