lib: add Math.sumPrecise type definition (ES2026 / esnext)

src/compiler/commandLineParser.ts

@@ -256,6 +256,7 @@ const libEntries: [string, string][] = [
     ["esnext.disposable", "lib.esnext.disposable.d.ts"],
     ["esnext.error", "lib.esnext.error.d.ts"],
     ["esnext.intl", "lib.esnext.intl.d.ts"],
+    ["esnext.math", "lib.esnext.math.d.ts"],
     ["esnext.sharedmemory", "lib.esnext.sharedmemory.d.ts"],
     ["esnext.temporal", "lib.esnext.temporal.d.ts"],
     ["esnext.typedarrays", "lib.esnext.typedarrays.d.ts"],

src/lib/esnext.d.ts

@@ -9,3 +9,4 @@
 /// <reference lib="esnext.typedarrays" />
 /// <reference lib="esnext.temporal" />
 /// <reference lib="esnext.date" />
+/// <reference lib="esnext.math" />

src/lib/esnext.math.d.ts

@@ -0,0 +1,12 @@
+interface Math {
+    /**
+     * Returns the sum of the values in the iterable using a more precise
+     * summation algorithm than naive floating-point addition.
+     * Returns `-0` if the iterable is empty.
+     * @param numbers An iterable (such as an Array) of numbers.
+     * @throws {TypeError} If `numbers` is not iterable, or if any value
+     * in the iterable is not of type `number`.
+     * @throws {RangeError} If the iterable yields 2^53 or more values.
+     */
+    sumPrecise(numbers: Iterable<number>): number;
+}

src/lib/libs.json

@@ -93,6 +93,7 @@
         "esnext.disposable",
         "esnext.error",
         "esnext.intl",
+        "esnext.math",
         "esnext.sharedmemory",
         "esnext.temporal",
         "esnext.typedarrays",