fix: remove zone if no points in xyEquallySpaced

* chore: add failing test case

* 

---------

Co-authored-by: Luc Patiny <luc@patiny.com>

package.json

@@ -88,25 +88,25 @@
   },
   "homepage": "https://github.com/mljs/spectra-processing#readme",
   "devDependencies": {
-    "@vitest/coverage-v8": "^1.5.3",
+    "@vitest/coverage-v8": "^2.0.4",
     "cheminfo-build": "^1.2.0",
     "eslint": "^8.57.0",
     "eslint-config-cheminfo-typescript": "^12.4.0",
     "jest-matcher-deep-close-to": "^3.0.2",
     "jscpd": "^3.5.10",
     "ml-spectra-fitting": "^4.2.3",
-    "prettier": "^3.2.5",
+    "prettier": "^3.3.3",
     "rimraf": "^5.0.5",
     "spectrum-generator": "^8.0.11",
-    "typescript": "^5.4.5",
-    "vitest": "^1.5.3"
+    "typescript": "^5.5.4",
+    "vitest": "^2.0.4"
   },
   "dependencies": {
     "binary-search": "^1.3.6",
     "cheminfo-types": "^1.7.3",
     "fft.js": "^4.0.4",
     "is-any-array": "^2.0.1",
-    "ml-matrix": "^6.11.0",
+    "ml-matrix": "^6.11.1",
     "ml-xsadd": "^2.0.0",
     "spline-interpolator": "^1.0.0"
   }

src/xy/__tests__/xyEquallySpaced.test.ts

@@ -3,8 +3,29 @@ import { join } from 'path';
 
 import { expect, test } from 'vitest';
 
+import { xSequentialFillFromTo } from '../../x/xSequentialFillFromTo';
 import { xyEquallySpaced } from '../xyEquallySpaced';
 
+test('one zone with zero point', () => {
+  const size = 256;
+  const x = xSequentialFillFromTo({ from: 0, to: 100, size });
+  const y = x.slice();
+
+  const from = x[size / 2];
+  const to = x[size / 2 + 1];
+  const ans = xyEquallySpaced(
+    { x, y },
+    {
+      numberOfPoints: 64,
+      zones: [
+        { from, to },
+        { from: 0, to: 50 },
+      ],
+    },
+  );
+  expect(ans.x).toHaveLength(64);
+});
+
 test('testing 1 points', () => {
   const x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
   const y = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

src/xy/xyEquallySpaced.ts

@@ -84,11 +84,10 @@ export function xyEquallySpaced(
   }
 
   const normalizedZones = zonesNormalize(zones, { from, to, exclusions });
-
   const zonesWithPointsRes = zonesWithPoints(normalizedZones, numberOfPoints, {
     from,
     to,
-  });
+  }).filter((zone) => zone.numberOfPoints);
 
   let xResult: number[] = [];
   let yResult: number[] = [];