diff --git a/.monorepolint.config.mjs b/.monorepolint.config.mjs
index 013f83f836..56b684a2fc 100644
--- a/.monorepolint.config.mjs
+++ b/.monorepolint.config.mjs
@@ -217,7 +217,7 @@ export default {
       options: {
         scripts: {
           bench: "node bench.ts",
-          "test:node": "node --test",
+          "test:node": "node --test test.ts",
           "test:tape": REMOVE,
         },
       },
diff --git a/package.json b/package.json
index 649d7d5124..2cd8e4b4e5 100644
--- a/package.json
+++ b/package.json
@@ -36,10 +36,10 @@
     "@monorepolint/config": "0.6.0-alpha.6",
     "@monorepolint/core": "0.6.0-alpha.6",
     "@monorepolint/rules": "0.6.0-alpha.6",
-    "@types/benchmark": "^2.1.5",
-    "@types/node": "22.15.3",
+    "@types/benchmark": "catalog:",
+    "@types/node": "catalog:",
     "acorn": "^8.14.1",
-    "benchmark": "^2.1.4",
+    "benchmark": "catalog:",
     "camelcase": "^8.0.0",
     "d3-queue": "*",
     "decamelize": "^6.0.0",
@@ -59,8 +59,8 @@
     "meow": "^13.2.0",
     "prettier": "^3.5.3",
     "progress": "^2.0.3",
-    "tsup": "^8.4.0",
-    "typescript": "^5.8.3",
+    "tsup": "catalog:",
+    "typescript": "catalog:",
     "typescript-eslint": "^8.38.0",
     "yaml": "^2.8.2"
   }
diff --git a/packages/turf-area/bench.ts b/packages/turf-area/bench.ts
index 31b3fc06c4..bb4d8ab2eb 100644
--- a/packages/turf-area/bench.ts
+++ b/packages/turf-area/bench.ts
@@ -1,31 +1,6 @@
-import fs from "fs";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import Benchmark from "benchmark";
-import { area } from "./index.js";
+import { area } from "./index.ts";
+import { benchFixtures } from "../../support/benchFixtures.mts";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-// Define fixtures
-const directory = path.join(__dirname, "test", "in") + path.sep;
-const fixtures = fs.readdirSync(directory).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directory + filename),
-  };
-});
-
-/**
- * Benmark Results
- *
- * polygon x 8,510,024 ops/sec ±0.28% (96 runs sampled)
- */
-
-// Define benchmark
-const suite = new Benchmark.Suite("turf-area");
-for (const { name, geojson } of fixtures) {
-  suite.add(name, () => area(geojson));
-}
-suite.on("cycle", (e) => console.log(String(e.target))).run();
+// Benchmark Results
+// polygon.geojson x 22,944,912 ops/sec ±0.28% (98 runs sampled)
+await benchFixtures("turf-area", (input) => area(input));
diff --git a/packages/turf-area/index.ts b/packages/turf-area/index.ts
index ff016ec7bc..17cca46a2a 100644
--- a/packages/turf-area/index.ts
+++ b/packages/turf-area/index.ts
@@ -1,4 +1,4 @@
-import { Feature, FeatureCollection, Geometry } from "geojson";
+import type { Feature, FeatureCollection, Geometry } from "geojson";
 import { earthRadius } from "@turf/helpers";
 import { geomReduce } from "@turf/meta";
 
diff --git a/packages/turf-area/package.json b/packages/turf-area/package.json
index bd2e819b28..e289f36abd 100644
--- a/packages/turf-area/package.json
+++ b/packages/turf-area/package.json
@@ -44,21 +44,14 @@
     "dist"
   ],
   "scripts": {
-    "bench": "tsx bench.ts",
+    "bench": "node bench.ts",
     "build": "tsup --config ../../tsup.config.ts",
     "test": "pnpm run /test:.*/",
-    "test:tape": "tsx test.ts"
+    "test:node": "node --test test.ts"
   },
   "devDependencies": {
-    "@types/benchmark": "catalog:",
-    "@types/tape": "catalog:",
-    "benchmark": "catalog:",
-    "load-json-file": "^7.0.1",
-    "tape": "catalog:",
     "tsup": "catalog:",
-    "tsx": "catalog:",
-    "typescript": "catalog:",
-    "write-json-file": "^6.0.0"
+    "typescript": "catalog:"
   },
   "dependencies": {
     "@turf/helpers": "workspace:*",
diff --git a/packages/turf-area/test.ts b/packages/turf-area/test.ts
index 40f008002c..b0690ce9c2 100644
--- a/packages/turf-area/test.ts
+++ b/packages/turf-area/test.ts
@@ -1,40 +1,17 @@
-import fs from "fs";
-import test from "tape";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import { writeJsonFileSync } from "write-json-file";
-import { area } from "./index.js";
+import test from "node:test";
+import { area } from "./index.ts";
 import { polygon } from "@turf/helpers";
-import { Polygon } from "geojson";
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
+import type { Polygon } from "geojson";
+import { testFixtures } from "../../support/testFixtures.mts";
+import assert from "assert";
 
-const directories = {
-  in: path.join(__dirname, "test", "in") + path.sep,
-  out: path.join(__dirname, "test", "out") + path.sep,
-};
-
-const fixtures = fs.readdirSync(directories.in).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directories.in + filename),
-  };
-});
-
-test("turf-area", (t) => {
-  for (const fixture of fixtures) {
-    const name = fixture.name;
-    const geojson = fixture.geojson;
-    const results = Math.round(area(geojson));
-    if (process.env.REGEN)
-      writeJsonFileSync(directories.out + name + ".json", results);
-    t.equal(results, loadJsonFileSync(directories.out + name + ".json"), name);
-  }
-  t.end();
+await test("area fixtures", async (t) => {
+  await testFixtures(t, (geojson) => {
+    return Math.round(area(geojson));
+  });
 });
 
-test("turf-area-length-check", (t) => {
+test("turf-area -- length-check", () => {
   const invalidPoly: Polygon = {
     type: "Polygon",
     coordinates: [
@@ -46,12 +23,10 @@ test("turf-area-length-check", (t) => {
     ],
   };
   const result = area(invalidPoly);
-  t.equal(result, 0);
-
-  t.end();
+  assert.strictEqual(result, 0);
 });
 
-test("turf-area-rotation-consistency", (t) => {
+test("turf-area rotation-consistency", () => {
   const rotatingPoly = polygon([
     [
       [28.321755510202507, 16.35627490376781],
@@ -84,7 +59,6 @@ test("turf-area-rotation-consistency", (t) => {
       rotatingPoly.geometry.coordinates[0][i];
 
     const curResult = area(changingPoly);
-    t.equal(result, curResult);
+    assert.strictEqual(result, curResult);
   }
-  t.end();
 });
diff --git a/packages/turf-bbox-clip/bench.ts b/packages/turf-bbox-clip/bench.ts
index ae93604d67..7166ad09dc 100644
--- a/packages/turf-bbox-clip/bench.ts
+++ b/packages/turf-bbox-clip/bench.ts
@@ -1,38 +1,16 @@
-import fs from "fs";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import Benchmark from "benchmark";
 import { bbox } from "@turf/bbox";
-import { bboxClip } from "./index.js";
+import { bboxClip } from "./index.ts";
+import { benchFixtures } from "../../support/benchFixtures.mts";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-const directory = path.join(__dirname, "test", "in") + path.sep;
-const fixtures = fs.readdirSync(directory).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directory + filename),
-  };
-});
-
-/**
- * Benchmark Results
- *
- * linestring-single-line x 1,065,073 ops/sec ±1.11% (90 runs sampled)
- * linestring x 56,599 ops/sec ±1.17% (90 runs sampled)
- * multi-linestring x 859,048 ops/sec ±1.01% (91 runs sampled)
- * multi-polygon x 26,991 ops/sec ±0.87% (94 runs sampled)
- * polygon-crossing-hole x 25,277 ops/sec ±0.72% (92 runs sampled)
- * polygon-holes x 27,233 ops/sec ±0.89% (91 runs sampled)
- * polygon x 21,339 ops/sec ±1.19% (89 runs sampled)
- */
-const suite = new Benchmark.Suite("turf-bbox-clip");
-for (const { name, geojson } of fixtures) {
-  suite.add(name, () =>
-    bboxClip(geojson.features[0], bbox(geojson.features[1]))
-  );
-}
-
-suite.on("cycle", (e) => console.log(String(e.target))).run();
+// Benchmark Results
+// linestring-single-line.geojson x 15,871,930 ops/sec ±0.24% (98 runs sampled)
+// linestring.geojson x 264,962 ops/sec ±1.14% (96 runs sampled)
+// multi-linestring.geojson x 7,892,547 ops/sec ±0.35% (95 runs sampled)
+// multi-polygon.geojson x 138,989 ops/sec ±0.31% (98 runs sampled)
+// polygon-crossing-hole.geojson x 151,793 ops/sec ±0.35% (95 runs sampled)
+// polygon-holes.geojson x 142,335 ops/sec ±0.30% (96 runs sampled)
+// polygon-point-intersection.geojson x 8,580,181 ops/sec ±0.73% (94 runs sampled)
+// polygon.geojson x 117,120 ops/sec ±0.18% (99 runs sampled)
+await benchFixtures("turf-bbox-clip", (input) =>
+  bboxClip(input.features[0], bbox(input.features[1]))
+);
diff --git a/packages/turf-bbox-clip/index.ts b/packages/turf-bbox-clip/index.ts
index 765dc39424..de306c6815 100644
--- a/packages/turf-bbox-clip/index.ts
+++ b/packages/turf-bbox-clip/index.ts
@@ -1,4 +1,4 @@
-import {
+import type {
   BBox,
   Feature,
   LineString,
@@ -15,7 +15,7 @@ import {
   polygon,
 } from "@turf/helpers";
 import { getGeom } from "@turf/invariant";
-import { lineclip, polygonclip } from "./lib/lineclip.js";
+import { lineclip, polygonclip } from "./lib/lineclip.ts";
 
 /**
  * Takes a {@link Feature} and a bbox and clips the feature to the bbox using
diff --git a/packages/turf-bbox-clip/lib/lineclip.ts b/packages/turf-bbox-clip/lib/lineclip.ts
index 92004521a6..5361412472 100644
--- a/packages/turf-bbox-clip/lib/lineclip.ts
+++ b/packages/turf-bbox-clip/lib/lineclip.ts
@@ -1,6 +1,6 @@
 // Cohen-Sutherland line clipping algorithm, adapted to efficiently
 // handle polylines rather than just segments
-import { BBox } from "geojson";
+import type { BBox } from "geojson";
 
 export function lineclip(
   points: number[][],
diff --git a/packages/turf-bbox-clip/package.json b/packages/turf-bbox-clip/package.json
index 1d0a229037..78b7569715 100644
--- a/packages/turf-bbox-clip/package.json
+++ b/packages/turf-bbox-clip/package.json
@@ -50,22 +50,15 @@
     "dist"
   ],
   "scripts": {
-    "bench": "tsx bench.ts",
+    "bench": "node bench.ts",
     "build": "tsup --config ../../tsup.config.ts",
     "test": "pnpm run /test:.*/",
-    "test:tape": "tsx test.ts"
+    "test:node": "node --test test.ts"
   },
   "devDependencies": {
     "@turf/bbox": "workspace:*",
-    "@types/benchmark": "catalog:",
-    "@types/tape": "catalog:",
-    "benchmark": "catalog:",
-    "load-json-file": "^7.0.1",
-    "tape": "catalog:",
     "tsup": "catalog:",
-    "tsx": "catalog:",
-    "typescript": "catalog:",
-    "write-json-file": "^6.0.0"
+    "typescript": "catalog:"
   },
   "dependencies": {
     "@turf/helpers": "workspace:*",
diff --git a/packages/turf-bbox-clip/test.ts b/packages/turf-bbox-clip/test.ts
index 9bd6116483..2f14f79e7f 100644
--- a/packages/turf-bbox-clip/test.ts
+++ b/packages/turf-bbox-clip/test.ts
@@ -1,60 +1,37 @@
-import fs from "fs";
-import test from "tape";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import { writeJsonFileSync } from "write-json-file";
 import { point, feature, featureCollection } from "@turf/helpers";
 import { bbox as turfBBox } from "@turf/bbox";
-import { bboxClip } from "./index.js";
+import { bboxClip } from "./index.ts";
+import { testFixtures } from "../../support/testFixtures.mts";
+import assert from "assert";
+import test from "node:test";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-const directories = {
-  in: path.join(__dirname, "test", "in") + path.sep,
-  out: path.join(__dirname, "test", "out") + path.sep,
-};
-
-const fixtures = fs.readdirSync(directories.in).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directories.in + filename),
-  };
-});
-
-test("turf-bbox-clip", (t) => {
-  for (const fixture of fixtures) {
-    const filename = fixture.filename;
-    const name = fixture.name;
-    const geojson = fixture.geojson;
+await test("bboxClip features", async (t) => {
+  await testFixtures(t, (geojson) => {
     const feature = geojson.features[0];
     const bbox = turfBBox(geojson.features[1]);
     const clipped = bboxClip(feature, bbox);
-    const results = featureCollection([
+    return featureCollection([
       colorize(feature, "#080"),
       colorize(clipped, "#F00"),
       colorize(geojson.features[1], "#00F", 3),
     ]);
+  });
+});
 
-    if (process.env.REGEN)
-      writeJsonFileSync(directories.out + filename, results);
-    t.deepEquals(results, loadJsonFileSync(directories.out + filename), name);
-  }
-  t.end();
+test("turf-bbox-clip -- throws", () => {
+  assert.throws(() => {
+    bboxClip(point([5, 10]) as any, [-180, -90, 180, 90]);
+  }, /geometry Point not supported/);
 });
 
-test("turf-bbox-clip -- throws", (t) => {
-  t.throws(
-    () => bboxClip(point([5, 10]), [-180, -90, 180, 90]),
-    /geometry Point not supported/
+test("turf-bbox-clip -- null geometries", () => {
+  assert.throws(
+    () => bboxClip(feature(null as any), [-180, -90, 180, 90]),
+    "coords must be GeoJSON Feature, Geometry Object or an Array"
   );
-  t.end();
 });
 
-function colorize(feature, color, width) {
-  color = color || "#F00";
-  width = width || 6;
+function colorize(feature: any, color = "#F00", width = 6) {
   feature.properties = {
     stroke: color,
     fill: color,
@@ -63,11 +40,3 @@ function colorize(feature, color, width) {
   };
   return feature;
 }
-
-test("turf-bbox-clip -- null geometries", (t) => {
-  t.throws(
-    () => bboxClip(feature(null), [-180, -90, 180, 90]),
-    "coords must be GeoJSON Feature, Geometry Object or an Array"
-  );
-  t.end();
-});
diff --git a/packages/turf-bezier-spline/bench.ts b/packages/turf-bezier-spline/bench.ts
index 4f886db616..d9023c0155 100644
--- a/packages/turf-bezier-spline/bench.ts
+++ b/packages/turf-bezier-spline/bench.ts
@@ -1,30 +1,13 @@
-import fs from "fs";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import Benchmark from "benchmark";
-import { bezierSpline } from "./index.js";
-
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-const directory = path.join(__dirname, "test", "in") + path.sep;
-const fixtures = fs.readdirSync(directory).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directory + filename),
-  };
-});
-
-/**
- * Benchmark Results
- *
- * bezierIn x 771 ops/sec ±1.31% (88 runs sampled)
- * simple x 768 ops/sec ±1.20% (89 runs sampled)
- */
-const suite = new Benchmark.Suite("turf-bezier-spline");
-for (const { name, geojson } of fixtures) {
-  suite.add(name, () => bezierSpline(geojson));
-}
-
-suite.on("cycle", (e) => console.log(String(e.target))).run();
+import { bezierSpline } from "./index.ts";
+import { benchFixtures } from "../../support/benchFixtures.mts";
+
+// Benchmark Results
+// linestring-single-line.geojson x 15,443,284 ops/sec ±0.31% (101 runs sampled)
+// linestring.geojson x 264,982 ops/sec ±0.37% (98 runs sampled)
+// multi-linestring.geojson x 7,798,170 ops/sec ±0.46% (100 runs sampled)
+// multi-polygon.geojson x 135,112 ops/sec ±0.20% (98 runs sampled)
+// polygon-crossing-hole.geojson x 152,794 ops/sec ±0.25% (99 runs sampled)
+// polygon-holes.geojson x 140,602 ops/sec ±0.21% (99 runs sampled)
+// polygon-point-intersection.geojson x 8,323,552 ops/sec ±0.61% (100 runs sampled)
+// polygon.geojson x 116,567 ops/sec ±0.20% (96 runs sampled)
+await benchFixtures("turf-bezier-spline", (input) => bezierSpline(input));
diff --git a/packages/turf-bezier-spline/index.ts b/packages/turf-bezier-spline/index.ts
index 99599877b0..1f5d285f4c 100644
--- a/packages/turf-bezier-spline/index.ts
+++ b/packages/turf-bezier-spline/index.ts
@@ -1,7 +1,7 @@
-import { Feature, LineString, GeoJsonProperties } from "geojson";
+import type { Feature, LineString, GeoJsonProperties } from "geojson";
 import { lineString } from "@turf/helpers";
 import { getGeom } from "@turf/invariant";
-import { Spline } from "./lib/spline.js";
+import { Spline } from "./lib/spline.ts";
 
 /**
  * Takes a {@link LineString|line} and returns a curved version
diff --git a/packages/turf-bezier-spline/lib/spline.ts b/packages/turf-bezier-spline/lib/spline.ts
index 67f1595f29..fc0a555a1b 100644
--- a/packages/turf-bezier-spline/lib/spline.ts
+++ b/packages/turf-bezier-spline/lib/spline.ts
@@ -1,4 +1,4 @@
-interface Point {
+export interface Point {
   x: number;
   y: number;
   z: number;
@@ -30,7 +30,7 @@ interface Point {
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-class Spline {
+export class Spline {
   public duration: number;
   public points: Point[];
   public sharpness: number;
@@ -194,6 +194,3 @@ function B(t: number) {
     (1 - t) * (1 - t) * (1 - t),
   ];
 }
-
-export { Spline, Point };
-export default Spline;
diff --git a/packages/turf-bezier-spline/package.json b/packages/turf-bezier-spline/package.json
index c660fd33f5..d11084fbc7 100644
--- a/packages/turf-bezier-spline/package.json
+++ b/packages/turf-bezier-spline/package.json
@@ -45,21 +45,14 @@
     "dist"
   ],
   "scripts": {
-    "bench": "tsx bench.ts",
+    "bench": "node bench.ts",
     "build": "tsup --config ../../tsup.config.ts",
     "test": "pnpm run /test:.*/",
-    "test:tape": "tsx test.ts"
+    "test:node": "node --test test.ts"
   },
   "devDependencies": {
-    "@types/benchmark": "catalog:",
-    "@types/tape": "catalog:",
-    "benchmark": "catalog:",
-    "load-json-file": "^7.0.1",
-    "tape": "catalog:",
     "tsup": "catalog:",
-    "tsx": "catalog:",
-    "typescript": "catalog:",
-    "write-json-file": "^6.0.0"
+    "typescript": "catalog:"
   },
   "dependencies": {
     "@turf/helpers": "workspace:*",
diff --git a/packages/turf-bezier-spline/test.ts b/packages/turf-bezier-spline/test.ts
index 69dcd7fff8..7149da29c7 100644
--- a/packages/turf-bezier-spline/test.ts
+++ b/packages/turf-bezier-spline/test.ts
@@ -1,45 +1,16 @@
-import fs from "fs";
-import test from "tape";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import { writeJsonFileSync } from "write-json-file";
 import { featureCollection } from "@turf/helpers";
-import { bezierSpline } from "./index.js";
+import { bezierSpline } from "./index.ts";
+import { testFixtures } from "../../support/testFixtures.mts";
+import test from "node:test";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-const directories = {
-  in: path.join(__dirname, "test", "in") + path.sep,
-  out: path.join(__dirname, "test", "out") + path.sep,
-};
-
-const fixtures = fs.readdirSync(directories.in).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directories.in + filename),
-  };
-});
-
-test("turf-bezier-spline", (t) => {
-  fixtures.forEach((fixture) => {
-    const filename = fixture.filename;
-    const name = fixture.name;
-    const geojson = fixture.geojson;
+await test("turf-bezier-spline fixtures", async (t) => {
+  await testFixtures(t, (geojson) => {
     const spline = colorize(bezierSpline(geojson));
-    const results = featureCollection([spline, geojson]);
-
-    if (process.env.REGEN)
-      writeJsonFileSync(directories.out + filename, results);
-    t.deepEquals(results, loadJsonFileSync(directories.out + filename), name);
+    return featureCollection([spline, geojson]);
   });
-  t.end();
 });
 
-function colorize(feature, color, width) {
-  color = color || "#F00";
-  width = width || 6;
+function colorize(feature: any, color = "#F00", width = 6) {
   feature.properties = {
     stroke: color,
     fill: color,
diff --git a/packages/turf-buffer/bench.ts b/packages/turf-buffer/bench.ts
index b7fa44a1d5..29f14e0e5b 100644
--- a/packages/turf-buffer/bench.ts
+++ b/packages/turf-buffer/bench.ts
@@ -1,54 +1,22 @@
-import fs from "fs";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import Benchmark from "benchmark";
-import { buffer } from "./index.js";
+import { buffer } from "./index.ts";
+import { benchFixtures } from "../../support/benchFixtures.mts";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-const directory = path.join(__dirname, "test", "in") + path.sep;
-const fixtures = fs.readdirSync(directory).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directory + filename),
-  };
-});
-
-/**
- * Benchmark Results
- *
- * feature-collection-points: 139.101ms
- * geometry-collection-points: 20.334ms
- * issue-#783: 33.209ms
- * linestring: 6.371ms
- * multi-linestring: 48.786ms
- * multi-point: 7.627ms
- * multi-polygon: 38.921ms
- * negative-buffer: 5.621ms
- * north-latitude-points: 71.144ms
- * northern-polygon: 2.644ms
- * point: 8.155ms
- * polygon-with-holes: 6.965ms
- * feature-collection-points x 722 ops/sec ±14.28% (65 runs sampled)
- * geometry-collection-points x 1,314 ops/sec ±7.87% (66 runs sampled)
- * issue-#783 x 1,404 ops/sec ±6.81% (64 runs sampled)
- * linestring x 2,936 ops/sec ±6.94% (72 runs sampled)
- * multi-linestring x 623 ops/sec ±4.35% (79 runs sampled)
- * multi-point x 1,735 ops/sec ±8.60% (65 runs sampled)
- * multi-polygon x 1,125 ops/sec ±3.93% (80 runs sampled)
- * north-latitude-points x 1,649 ops/sec ±2.09% (86 runs sampled)
- * northern-polygon x 4,658 ops/sec ±3.08% (78 runs sampled)
- * point x 65,020 ops/sec ±1.29% (85 runs sampled)
- * polygon-with-holes x 2,795 ops/sec ±2.98% (81 runs sampled)
- */
-const suite = new Benchmark.Suite("turf-buffer");
-for (const { name, geojson } of fixtures) {
-  console.time(name);
-  buffer(geojson, 50, { units: "miles" });
-  console.timeEnd(name);
-  suite.add(name, () => buffer(geojson, 50, { units: "miles" }));
-}
-
-suite.on("cycle", (e) => console.log(String(e.target))).run();
+// Benchmark Results
+// feature-collection-points.geojson x 10,741 ops/sec ±0.84% (96 runs sampled)
+// geometry-collection-points.geojson x 16,229 ops/sec ±0.47% (99 runs sampled)
+// issue-#783.geojson x 18,447 ops/sec ±0.27% (97 runs sampled)
+// issue-#801-Ecuador.geojson x 27,774 ops/sec ±0.41% (97 runs sampled)
+// issue-#801.geojson x 27,382 ops/sec ±0.18% (99 runs sampled)
+// issue-#815.geojson x 42,241 ops/sec ±0.27% (98 runs sampled)
+// issue-#900.geojson x 9,042 ops/sec ±0.32% (96 runs sampled)
+// issue-#916.geojson x 23,689 ops/sec ±0.52% (97 runs sampled)
+// linestring.geojson x 36,095 ops/sec ±0.41% (95 runs sampled)
+// multi-linestring.geojson x 7,168 ops/sec ±0.15% (99 runs sampled)
+// multi-point.geojson x 21,735 ops/sec ±0.60% (99 runs sampled)
+// multi-polygon.geojson x 13,019 ops/sec ±0.18% (93 runs sampled)
+// negative-buffer.geojson x 46,876 ops/sec ±0.19% (100 runs sampled)
+// north-latitude-points.geojson x 16,680 ops/sec ±0.17% (98 runs sampled)
+// northern-polygon.geojson x 46,875 ops/sec ±0.15% (99 runs sampled)
+// point.geojson x 59,494 ops/sec ±0.17% (96 runs sampled)
+// polygon-with-holes.geojson x 30,772 ops/sec ±0.59% (98 runs sampled)
+benchFixtures("turf-buffer", (input) => buffer(input, 50, { units: "miles" }));
diff --git a/packages/turf-buffer/index.ts b/packages/turf-buffer/index.ts
index 075e79ba74..8134334f92 100644
--- a/packages/turf-buffer/index.ts
+++ b/packages/turf-buffer/index.ts
@@ -2,16 +2,16 @@ import { center } from "@turf/center";
 // @ts-expect-error We're hopefully dropping @turf/jsts entirely soon, so lets just go without types for now
 import jsts from "@turf/jsts";
 import { geomEach, featureEach } from "@turf/meta";
-import { geoAzimuthalEquidistant, GeoProjection } from "d3-geo";
+import { geoAzimuthalEquidistant, type GeoProjection } from "d3-geo";
 import {
   feature,
   featureCollection,
   radiansToLength,
   lengthToRadians,
   earthRadius,
-  Units,
+  type Units,
 } from "@turf/helpers";
-import {
+import type {
   Feature,
   FeatureCollection,
   GeometryCollection,
diff --git a/packages/turf-buffer/package.json b/packages/turf-buffer/package.json
index 0792fa28ad..e2a14e6036 100644
--- a/packages/turf-buffer/package.json
+++ b/packages/turf-buffer/package.json
@@ -52,25 +52,18 @@
     "dist"
   ],
   "scripts": {
-    "bench": "tsx bench.ts",
+    "bench": "node bench.ts",
     "build": "tsup --config ../../tsup.config.ts",
     "test": "pnpm run /test:.*/",
-    "test:tape": "tsx test.ts",
+    "test:node": "node --test test.ts",
     "test:types": "tstyche"
   },
   "devDependencies": {
     "@turf/truncate": "workspace:*",
-    "@types/benchmark": "catalog:",
     "@types/d3-geo": "^3.1.0",
-    "@types/tape": "catalog:",
-    "benchmark": "catalog:",
-    "load-json-file": "^7.0.1",
-    "tape": "catalog:",
     "tstyche": "catalog:",
     "tsup": "catalog:",
-    "tsx": "catalog:",
-    "typescript": "catalog:",
-    "write-json-file": "^6.0.0"
+    "typescript": "catalog:"
   },
   "dependencies": {
     "@turf/bbox": "workspace:*",
diff --git a/packages/turf-buffer/test.ts b/packages/turf-buffer/test.ts
index d0ae678321..ed0c89a6e1 100644
--- a/packages/turf-buffer/test.ts
+++ b/packages/turf-buffer/test.ts
@@ -1,9 +1,3 @@
-import fs from "fs";
-import test from "tape";
-import path from "path";
-import { fileURLToPath } from "url";
-import { loadJsonFileSync } from "load-json-file";
-import { writeJsonFileSync } from "write-json-file";
 import { truncate } from "@turf/truncate";
 import { featureEach } from "@turf/meta";
 import {
@@ -12,36 +6,17 @@ import {
   polygon,
   geometryCollection,
 } from "@turf/helpers";
-import { buffer } from "./index.js";
+import { buffer } from "./index.ts";
+import { testFixtures } from "../../support/testFixtures.mts";
+import test from "node:test";
+import assert from "assert";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
-const directories = {
-  in: path.join(__dirname, "test", "in") + path.sep,
-  out: path.join(__dirname, "test", "out") + path.sep,
-};
-
-var fixtures = fs.readdirSync(directories.in).map((filename) => {
-  return {
-    filename,
-    name: path.parse(filename).name,
-    geojson: loadJsonFileSync(directories.in + filename),
-  };
-});
-// fixtures = fixtures.filter(({name}) => name === 'feature-collection-points');
-
-test("turf-buffer", (t) => {
-  fixtures.forEach((fixture) => {
-    const filename = fixture.filename;
-    const name = fixture.name;
-    const geojson = fixture.geojson;
-    const properties = geojson.properties || {};
-    const radius = properties.radius || 50;
-    const units = properties.units || "miles";
-    const steps = properties.steps;
+await test("buffer fixtures", async (t) => {
+  await testFixtures(t, (geojson) => {
+    const { radius = 50, units = "miles", steps } = geojson.properties ?? {};
 
     const buffered = truncate(
-      buffer(geojson, radius, { units: units, steps: steps })
+      buffer(geojson, radius, { units: units, steps: steps })!
     );
 
     // Add Results to FeatureCollection
@@ -53,15 +28,12 @@ test("turf-buffer", (t) => {
       results.features.push(colorize(feature, "#00F"))
     );
 
-    if (process.env.REGEN)
-      writeJsonFileSync(directories.out + filename, results);
-    t.deepEqual(results, loadJsonFileSync(directories.out + filename), name);
+    return results;
   });
-  t.end();
 });
 
 // https://github.com/Turfjs/turf/pull/736
-test("turf-buffer - Support Negative Buffer", (t) => {
+test("turf-buffer - Support Negative Buffer", () => {
   const poly = polygon([
     [
       [11, 0],
@@ -74,8 +46,7 @@ test("turf-buffer - Support Negative Buffer", (t) => {
     ],
   ]);
 
-  t.assert(buffer(poly, -50), "allow negative buffer param");
-  t.end();
+  assert(buffer(poly, -50), "allow negative buffer param");
 });
 
 test("turf-buffer - Support Geometry Objects", (t) => {
@@ -93,13 +64,12 @@ test("turf-buffer - Support Geometry Objects", (t) => {
   ]);
   const gc = geometryCollection([pt.geometry, poly.geometry]);
 
-  t.assert(buffer(gc, 10), "support Geometry Collection");
-  t.assert(buffer(pt.geometry, 10), "support Point Geometry");
-  t.assert(buffer(poly.geometry, 10), "support Polygon Geometry");
-  t.end();
+  assert(buffer(gc, 10), "support Geometry Collection");
+  assert(buffer(pt.geometry, 10), "support Point Geometry");
+  assert(buffer(poly.geometry, 10), "support Polygon Geometry");
 });
 
-test("turf-buffer - Prevent Input Mutation", (t) => {
+test("turf-buffer - Prevent Input Mutation", () => {
   const pt = point([61, 5]);
   const poly = polygon([
     [
@@ -112,7 +82,7 @@ test("turf-buffer - Prevent Input Mutation", (t) => {
       [11, 0],
     ],
   ]);
-  const collection = featureCollection([pt, poly]);
+  const collection = featureCollection([pt as any, poly]);
 
   const beforePt = JSON.parse(JSON.stringify(pt));
   const beforePoly = JSON.parse(JSON.stringify(poly));
@@ -122,15 +92,18 @@ test("turf-buffer - Prevent Input Mutation", (t) => {
   buffer(poly, 10);
   buffer(collection, 10);
 
-  t.deepEqual(pt, beforePt, "pt should not mutate");
-  t.deepEqual(poly, beforePoly, "poly should not mutate");
-  t.deepEqual(collection, beforeCollection, "collection should not mutate");
-  t.end();
+  assert.deepEqual(pt, beforePt, "pt should not mutate");
+  assert.deepEqual(poly, beforePoly, "poly should not mutate");
+  assert.deepEqual(
+    collection,
+    beforeCollection,
+    "collection should not mutate"
+  );
 });
 
 // https://github.com/Turfjs/turf/issues/745
 // https://github.com/Turfjs/turf/pull/736#issuecomment-301937747
-test("turf-buffer - morphological closing", (t) => {
+test("turf-buffer - morphological closing", () => {
   const poly = polygon([
     [
       [11, 0],
@@ -143,20 +116,19 @@ test("turf-buffer - morphological closing", (t) => {
     ],
   ]);
 
-  t.equal(
+  assert.strictEqual(
     buffer(poly, -500, { units: "miles" }),
     undefined,
     "empty geometry should be undefined"
   );
-  t.deepEqual(
+  assert.deepEqual(
     buffer(featureCollection([poly]), -500, { units: "miles" }),
     featureCollection([]),
     "empty geometries should be an empty FeatureCollection"
   );
-  t.end();
 });
 
-test("turf-buffer - undefined return", (t) => {
+test("turf-buffer - undefined return", () => {
   const poly: GeoJSON.Feature<GeoJSON.Polygon> = {
     type: "Feature",
     properties: {},
@@ -174,16 +146,14 @@ test("turf-buffer - undefined return", (t) => {
     },
   };
 
-  t.equal(
+  assert.strictEqual(
     buffer(poly, -100000000),
     undefined,
     "empty geometry should be undefined if the resulting geometry is invalid"
   );
-  t.end();
 });
 
-function colorize(feature, color) {
-  color = color || "#F00";
+function colorize(feature: any, color = "#F00") {
   if (feature.properties) {
     feature.properties.stroke = color;
     feature.properties.fill = color;
diff --git a/packages/turf-center/package.json b/packages/turf-center/package.json
index 3413441b58..285c6e3d35 100644
--- a/packages/turf-center/package.json
+++ b/packages/turf-center/package.json
@@ -49,7 +49,7 @@
     "bench": "node bench.ts",
     "build": "tsup --config ../../tsup.config.ts",
     "test": "pnpm run /test:.*/",
-    "test:node": "node --test",
+    "test:node": "node --test test.ts",
     "test:types": "tsc --esModuleInterop --module node16 --moduleResolution node16 --noEmit --strict types.ts"
   },
   "devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2cc56153f6..a7b87ab822 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -12,6 +12,9 @@ catalogs:
     '@types/geojson':
       specifier: ^7946.0.10
       version: 7946.0.14
+    '@types/node':
+      specifier: ^22.19.17
+      version: 22.19.17
     '@types/tape':
       specifier: ^5.8.1
       version: 5.8.1
@@ -60,16 +63,16 @@ importers:
         specifier: 0.6.0-alpha.6
         version: 0.6.0-alpha.6
       '@types/benchmark':
-        specifier: ^2.1.5
+        specifier: 'catalog:'
         version: 2.1.5
       '@types/node':
-        specifier: 22.15.3
-        version: 22.15.3
+        specifier: 'catalog:'
+        version: 22.19.17
       acorn:
         specifier: ^8.14.1
         version: 8.15.0
       benchmark:
-        specifier: ^2.1.4
+        specifier: 'catalog:'
         version: 2.1.4
       camelcase:
         specifier: ^8.0.0
@@ -112,7 +115,7 @@ importers:
         version: 9.1.7
       lerna:
         specifier: ^9.0.3
-        version: 9.0.3(@types/node@22.15.3)
+        version: 9.0.3(@types/node@22.19.17)
       lint-staged:
         specifier: ^15.5.1
         version: 15.5.1
@@ -129,10 +132,10 @@ importers:
         specifier: ^2.0.3
         version: 2.0.3
       tsup:
-        specifier: ^8.4.0
+        specifier: 'catalog:'
         version: 8.4.0(postcss@8.5.3)(tsx@4.19.4)(typescript@5.8.3)(yaml@2.8.2)
       typescript:
-        specifier: ^5.8.3
+        specifier: 'catalog:'
         version: 5.8.3
       typescript-eslint:
         specifier: ^8.38.0
@@ -666,33 +669,12 @@ importers:
         specifier: 'catalog:'
         version: 2.8.1
     devDependencies:
-      '@types/benchmark':
-        specifier: 'catalog:'
-        version: 2.1.5
-      '@types/tape':
-        specifier: 'catalog:'
-        version: 5.8.1
-      benchmark:
-        specifier: 'catalog:'
-        version: 2.1.4
-      load-json-file:
-        specifier: ^7.0.1
-        version: 7.0.1
-      tape:
-        specifier: 'catalog:'
-        version: 5.9.0
       tsup:
         specifier: 'catalog:'
         version: 8.4.0(postcss@8.5.3)(tsx@4.19.4)(typescript@5.8.3)(yaml@2.8.2)
-      tsx:
-        specifier: 'catalog:'
-        version: 4.19.4
       typescript:
         specifier: 'catalog:'
         version: 5.8.3
-      write-json-file:
-        specifier: ^6.0.0
-        version: 6.0.0
 
   packages/turf-bbox:
     dependencies:
@@ -749,33 +731,12 @@ importers:
       '@turf/bbox':
         specifier: workspace:*
         version: link:../turf-bbox
-      '@types/benchmark':
-        specifier: 'catalog:'
-        version: 2.1.5
-      '@types/tape':
-        specifier: 'catalog:'
-        version: 5.8.1
-      benchmark:
-        specifier: 'catalog:'
-        version: 2.1.4
-      load-json-file:
-        specifier: ^7.0.1
-        version: 7.0.1
-      tape:
-        specifier: 'catalog:'
-        version: 5.9.0
       tsup:
         specifier: 'catalog:'
         version: 8.4.0(postcss@8.5.3)(tsx@4.19.4)(typescript@5.8.3)(yaml@2.8.2)
-      tsx:
-        specifier: 'catalog:'
-        version: 4.19.4
       typescript:
         specifier: 'catalog:'
         version: 5.8.3
-      write-json-file:
-        specifier: ^6.0.0
-        version: 6.0.0
 
   packages/turf-bbox-polygon:
     dependencies:
@@ -869,33 +830,12 @@ importers:
         specifier: 'catalog:'
         version: 2.8.1
     devDependencies:
-      '@types/benchmark':
-        specifier: 'catalog:'
-        version: 2.1.5
-      '@types/tape':
-        specifier: 'catalog:'
-        version: 5.8.1
-      benchmark:
-        specifier: 'catalog:'
-        version: 2.1.4
-      load-json-file:
-        specifier: ^7.0.1
-        version: 7.0.1
-      tape:
-        specifier: 'catalog:'
-        version: 5.9.0
       tsup:
         specifier: 'catalog:'
         version: 8.4.0(postcss@8.5.3)(tsx@4.19.4)(typescript@5.8.3)(yaml@2.8.2)
-      tsx:
-        specifier: 'catalog:'
-        version: 4.19.4
       typescript:
         specifier: 'catalog:'
         version: 5.8.3
-      write-json-file:
-        specifier: ^6.0.0
-        version: 6.0.0
 
   packages/turf-boolean-clockwise:
     dependencies:
@@ -1637,39 +1577,18 @@ importers:
       '@turf/truncate':
         specifier: workspace:*
         version: link:../turf-truncate
-      '@types/benchmark':
-        specifier: 'catalog:'
-        version: 2.1.5
       '@types/d3-geo':
         specifier: ^3.1.0
         version: 3.1.0
-      '@types/tape':
-        specifier: 'catalog:'
-        version: 5.8.1
-      benchmark:
-        specifier: 'catalog:'
-        version: 2.1.4
-      load-json-file:
-        specifier: ^7.0.1
-        version: 7.0.1
-      tape:
-        specifier: 'catalog:'
-        version: 5.9.0
       tstyche:
         specifier: 'catalog:'
         version: 6.2.0(typescript@5.8.3)
       tsup:
         specifier: 'catalog:'
         version: 8.4.0(postcss@8.5.3)(tsx@4.19.4)(typescript@5.8.3)(yaml@2.8.2)
-      tsx:
-        specifier: 'catalog:'
-        version: 4.19.4
       typescript:
         specifier: 'catalog:'
         version: 5.8.3
-      write-json-file:
-        specifier: ^6.0.0
-        version: 6.0.0
 
   packages/turf-center:
     dependencies:
@@ -7768,6 +7687,9 @@ packages:
   '@types/node@22.15.3':
     resolution: {integrity: sha512-lX7HFZeHf4QG/J7tBZqrCAXwz9J5RD56Y6MpP0eJkka8p+K0RY/yBTW7CYFJ4VGCclxqOLKmiGP5juQc6MKgcw==}
 
+  '@types/node@22.19.17':
+    resolution: {integrity: sha512-wGdMcf+vPYM6jikpS/qhg6WiqSV/OhG+jeeHT/KlVqxYfD40iYJf9/AE1uQxVWFvU7MipKRkRv8NSHiCGgPr8Q==}
+
   '@types/normalize-package-data@2.4.4':
     resolution: {integrity: sha512-37i+OaWTh9qeK4LSHPsyRC7NahnGotNuZvjLSgcPzblpHB3rrCJxAOgI5gCdKm7coonsaX1Of0ILiTcnZjbfxA==}
 
@@ -12678,128 +12600,128 @@ snapshots:
 
   '@inquirer/ansi@1.0.2': {}
 
-  '@inquirer/checkbox@4.3.2(@types/node@22.15.3)':
+  '@inquirer/checkbox@4.3.2(@types/node@22.19.17)':
     dependencies:
       '@inquirer/ansi': 1.0.2
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
       '@inquirer/figures': 1.0.15
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       yoctocolors-cjs: 2.1.3
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/confirm@5.1.21(@types/node@22.15.3)':
+  '@inquirer/confirm@5.1.21(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/core@10.3.2(@types/node@22.15.3)':
+  '@inquirer/core@10.3.2(@types/node@22.19.17)':
     dependencies:
       '@inquirer/ansi': 1.0.2
       '@inquirer/figures': 1.0.15
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       cli-width: 4.1.0
       mute-stream: 2.0.0
       signal-exit: 4.1.0
       wrap-ansi: 6.2.0
       yoctocolors-cjs: 2.1.3
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/editor@4.2.23(@types/node@22.15.3)':
+  '@inquirer/editor@4.2.23(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/external-editor': 1.0.3(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/external-editor': 1.0.3(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/expand@4.0.23(@types/node@22.15.3)':
+  '@inquirer/expand@4.0.23(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       yoctocolors-cjs: 2.1.3
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/external-editor@1.0.3(@types/node@22.15.3)':
+  '@inquirer/external-editor@1.0.3(@types/node@22.19.17)':
     dependencies:
       chardet: 2.1.1
       iconv-lite: 0.7.0
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
   '@inquirer/figures@1.0.15': {}
 
-  '@inquirer/input@4.3.1(@types/node@22.15.3)':
+  '@inquirer/input@4.3.1(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/number@3.0.23(@types/node@22.15.3)':
+  '@inquirer/number@3.0.23(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/password@4.0.23(@types/node@22.15.3)':
+  '@inquirer/password@4.0.23(@types/node@22.19.17)':
     dependencies:
       '@inquirer/ansi': 1.0.2
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
     optionalDependencies:
-      '@types/node': 22.15.3
-
-  '@inquirer/prompts@7.10.1(@types/node@22.15.3)':
-    dependencies:
-      '@inquirer/checkbox': 4.3.2(@types/node@22.15.3)
-      '@inquirer/confirm': 5.1.21(@types/node@22.15.3)
-      '@inquirer/editor': 4.2.23(@types/node@22.15.3)
-      '@inquirer/expand': 4.0.23(@types/node@22.15.3)
-      '@inquirer/input': 4.3.1(@types/node@22.15.3)
-      '@inquirer/number': 3.0.23(@types/node@22.15.3)
-      '@inquirer/password': 4.0.23(@types/node@22.15.3)
-      '@inquirer/rawlist': 4.1.11(@types/node@22.15.3)
-      '@inquirer/search': 3.2.2(@types/node@22.15.3)
-      '@inquirer/select': 4.4.2(@types/node@22.15.3)
+      '@types/node': 22.19.17
+
+  '@inquirer/prompts@7.10.1(@types/node@22.19.17)':
+    dependencies:
+      '@inquirer/checkbox': 4.3.2(@types/node@22.19.17)
+      '@inquirer/confirm': 5.1.21(@types/node@22.19.17)
+      '@inquirer/editor': 4.2.23(@types/node@22.19.17)
+      '@inquirer/expand': 4.0.23(@types/node@22.19.17)
+      '@inquirer/input': 4.3.1(@types/node@22.19.17)
+      '@inquirer/number': 3.0.23(@types/node@22.19.17)
+      '@inquirer/password': 4.0.23(@types/node@22.19.17)
+      '@inquirer/rawlist': 4.1.11(@types/node@22.19.17)
+      '@inquirer/search': 3.2.2(@types/node@22.19.17)
+      '@inquirer/select': 4.4.2(@types/node@22.19.17)
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/rawlist@4.1.11(@types/node@22.15.3)':
+  '@inquirer/rawlist@4.1.11(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       yoctocolors-cjs: 2.1.3
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/search@3.2.2(@types/node@22.15.3)':
+  '@inquirer/search@3.2.2(@types/node@22.19.17)':
     dependencies:
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
       '@inquirer/figures': 1.0.15
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       yoctocolors-cjs: 2.1.3
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/select@4.4.2(@types/node@22.15.3)':
+  '@inquirer/select@4.4.2(@types/node@22.19.17)':
     dependencies:
       '@inquirer/ansi': 1.0.2
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
       '@inquirer/figures': 1.0.15
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       yoctocolors-cjs: 2.1.3
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
-  '@inquirer/type@3.0.10(@types/node@22.15.3)':
+  '@inquirer/type@3.0.10(@types/node@22.19.17)':
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
   '@isaacs/balanced-match@4.0.1': {}
 
@@ -12858,7 +12780,7 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.0
 
-  '@lerna/create@9.0.3(@types/node@22.15.3)(typescript@5.8.3)':
+  '@lerna/create@9.0.3(@types/node@22.19.17)(typescript@5.8.3)':
     dependencies:
       '@npmcli/arborist': 9.1.6
       '@npmcli/package-json': 7.0.2
@@ -12885,7 +12807,7 @@ snapshots:
       has-unicode: 2.0.1
       ini: 1.3.8
       init-package-json: 8.2.2
-      inquirer: 12.9.6(@types/node@22.15.3)
+      inquirer: 12.9.6(@types/node@22.19.17)
       is-ci: 3.0.1
       is-stream: 2.0.0
       js-yaml: 4.1.1
@@ -13542,6 +13464,10 @@ snapshots:
     dependencies:
       undici-types: 6.21.0
 
+  '@types/node@22.19.17':
+    dependencies:
+      undici-types: 6.21.0
+
   '@types/normalize-package-data@2.4.4': {}
 
   '@types/object-assign@4.0.33': {}
@@ -13647,7 +13573,7 @@ snapshots:
     dependencies:
       '@typescript-eslint/types': 8.31.1
       '@typescript-eslint/visitor-keys': 8.31.1
-      debug: 4.4.0
+      debug: 4.4.3
       fast-glob: 3.3.3
       is-glob: 4.0.3
       minimatch: 9.0.5
@@ -13760,7 +13686,7 @@ snapshots:
 
   agent-base@7.1.1:
     dependencies:
-      debug: 4.4.0
+      debug: 4.4.3
     transitivePeerDependencies:
       - supports-color
 
@@ -15345,14 +15271,14 @@ snapshots:
   http-proxy-agent@7.0.2:
     dependencies:
       agent-base: 7.1.1
-      debug: 4.4.0
+      debug: 4.4.3
     transitivePeerDependencies:
       - supports-color
 
   https-proxy-agent@7.0.4:
     dependencies:
       agent-base: 7.1.1
-      debug: 4.4.0
+      debug: 4.4.3
     transitivePeerDependencies:
       - supports-color
 
@@ -15420,17 +15346,17 @@ snapshots:
       validate-npm-package-license: 3.0.4
       validate-npm-package-name: 6.0.2
 
-  inquirer@12.9.6(@types/node@22.15.3):
+  inquirer@12.9.6(@types/node@22.19.17):
     dependencies:
       '@inquirer/ansi': 1.0.2
-      '@inquirer/core': 10.3.2(@types/node@22.15.3)
-      '@inquirer/prompts': 7.10.1(@types/node@22.15.3)
-      '@inquirer/type': 3.0.10(@types/node@22.15.3)
+      '@inquirer/core': 10.3.2(@types/node@22.19.17)
+      '@inquirer/prompts': 7.10.1(@types/node@22.19.17)
+      '@inquirer/type': 3.0.10(@types/node@22.19.17)
       mute-stream: 2.0.0
       run-async: 4.0.6
       rxjs: 7.8.2
     optionalDependencies:
-      '@types/node': 22.15.3
+      '@types/node': 22.19.17
 
   internal-slot@1.0.7:
     dependencies:
@@ -15734,9 +15660,9 @@ snapshots:
 
   kuler@2.0.0: {}
 
-  lerna@9.0.3(@types/node@22.15.3):
+  lerna@9.0.3(@types/node@22.19.17):
     dependencies:
-      '@lerna/create': 9.0.3(@types/node@22.15.3)(typescript@5.8.3)
+      '@lerna/create': 9.0.3(@types/node@22.19.17)(typescript@5.8.3)
       '@npmcli/arborist': 9.1.6
       '@npmcli/package-json': 7.0.2
       '@npmcli/run-script': 10.0.2
@@ -15766,7 +15692,7 @@ snapshots:
       import-local: 3.1.0
       ini: 1.3.8
       init-package-json: 8.2.2
-      inquirer: 12.9.6(@types/node@22.15.3)
+      inquirer: 12.9.6(@types/node@22.19.17)
       is-ci: 3.0.1
       is-stream: 2.0.0
       jest-diff: 30.2.0
@@ -17492,7 +17418,7 @@ snapshots:
   socks-proxy-agent@8.0.3:
     dependencies:
       agent-base: 7.1.1
-      debug: 4.4.0
+      debug: 4.4.3
       socks: 2.7.1
     transitivePeerDependencies:
       - supports-color
@@ -17659,7 +17585,7 @@ snapshots:
 
   sucrase@3.35.0:
     dependencies:
-      '@jridgewell/gen-mapping': 0.3.5
+      '@jridgewell/gen-mapping': 0.3.8
       commander: 4.1.1
       glob: 10.5.0
       lines-and-columns: 1.2.4
@@ -17835,7 +17761,7 @@ snapshots:
       cac: 6.7.14
       chokidar: 4.0.3
       consola: 3.4.2
-      debug: 4.4.0
+      debug: 4.4.3
       esbuild: 0.25.3
       joycon: 3.1.1
       picocolors: 1.1.1
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 8226f7e5a7..1f5be2424c 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -4,6 +4,7 @@ packages:
 catalog:
   "@types/benchmark": ^2.1.5
   "@types/geojson": ^7946.0.10
+  "@types/node": ^22.19.17
   "@types/tape": ^5.8.1
   benchmark: ^2.1.4
   tape: ^5.9.0
diff --git a/support/testFixtures.mts b/support/testFixtures.mts
index f568cfd849..3aae276d78 100644
--- a/support/testFixtures.mts
+++ b/support/testFixtures.mts
@@ -3,6 +3,18 @@ import { readdir, readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
 import type { TestContext } from "node:test";
 
+const VALID_TYPES: ReadonlySet<string> = new Set([
+  "Feature",
+  "FeatureCollection",
+  "GeometryCollection",
+  "Point",
+  "LineString",
+  "Polygon",
+  "MultiPoint",
+  "MultiLineString",
+  "MultiPolygon",
+]);
+
 export async function testFixtures(t: TestContext, fn: (input: any) => any) {
   const dirs = {
     in: path.join(process.cwd(), "test", "in"),
@@ -12,9 +24,19 @@ export async function testFixtures(t: TestContext, fn: (input: any) => any) {
   for (const file of await readdir(dirs.in)) {
     await t.test(file, async () => {
       const inputPath = path.join(dirs.in, file);
-      const outputPath = path.join(dirs.out, file);
       const inputData = JSON.parse(await readFile(inputPath, "utf-8"));
       const result = fn(inputData);
+
+      let outputPath = path.join(dirs.out, file);
+      // if we don't have geojson output, we should use .json instead
+      if (
+        result == null ||
+        typeof result != "object" ||
+        !VALID_TYPES.has(result.type)
+      ) {
+        outputPath = outputPath.replace(/\.geojson$/, ".json");
+      }
+
       if (process.env.REGEN) {
         await writeFile(outputPath, JSON.stringify(result, null, 2));
       } else {