fix: resolve TypeScript errors for x.at(-1) returning number | undefined

Author: lpatiny

src/xy/xyFilterX.ts

@@ -45,12 +45,9 @@ export function xyFilterX(
       y: Array.from(y),
     };
   }
-  const {
-    from = x[0],
-    to = x.at(-1),
-    zones = [{ from, to }],
-    exclusions = [],
-  } = options;
+  const from = options.from ?? x[0];
+  const to = options.to ?? x.at(-1) ?? from;
+  const { zones = [{ from, to }], exclusions = [] } = options;
 
   const normalizedZones = zonesNormalize(zones, { from, to, exclusions });
 

src/xy/xyReduce.ts

@@ -67,12 +67,9 @@ export function xyReduce(
     };
   }
   const { x, y } = data;
-  const {
-    from = x[0],
-    to = x.at(-1),
-    nbPoints = 4001,
-    optimize = false,
-  } = options;
+  const from = options.from ?? x[0];
+  const to = options.to ?? x.at(-1) ?? from;
+  const { nbPoints = 4001, optimize = false } = options;
   let { zones = [] } = options;
 
   zones = zonesNormalize(zones, { from, to });

src/xy/xyReduceNonContinuous.ts

@@ -51,7 +51,9 @@ export function xyReduceNonContinuous(
     };
   }
   const { x, y } = data;
-  const { from = x[0], to = x.at(-1), maxApproximateNbPoints = 4001 } = options;
+  const from = options.from ?? x[0];
+  const to = options.to ?? x.at(-1) ?? from;
+  const { maxApproximateNbPoints = 4001 } = options;
   let { zones = [] } = options;
 
   zones = zonesNormalize(zones, { from, to });