fix: #3180 fix type definitions of function add and multiply to a…

…llow

  more than two arguments

HISTORY.md

@@ -2,6 +2,8 @@
 
 # unpublished changes since 12.4.1
 
+- Fix: #3180 fix type definitions of functions `add` and `multiply` to allow
+  more than two arguments. 
 - Docs: correct the docs about `traverse` returning void (#3177). 
   Thanks @rohildshah.
 

test/typescript-tests/testTypes.ts

@@ -79,6 +79,10 @@ Basic usage examples
   math.pow(m2by2, 2)
   const angle = 0.2
   math.add(math.pow(math.sin(angle), 2), math.pow(math.cos(angle), 2))
+  math.add(2, 3, 4)
+  math.add(2, 3, math.bignumber(4))
+  math.multiply(2, 3, 4)
+  math.multiply(2, 3, math.bignumber(4))
 
   // std and variance check
 

types/index.d.ts

@@ -1036,7 +1036,9 @@ export interface MathJsInstance extends MathJsFactory {
    * @returns Sum of x and y
    */
   add<T extends MathType>(x: T, y: T): T
+  add<T extends MathType>(...values: T[]): T
   add(x: MathType, y: MathType): MathType
+  add(...values: MathType[]): MathType
 
   /**
    * Calculate the cubic root of a value.
@@ -1283,6 +1285,8 @@ export interface MathJsInstance extends MathJsFactory {
   multiply(x: Unit, y: Unit): Unit
   multiply(x: number, y: number): number
   multiply(x: MathType, y: MathType): MathType
+  multiply<T extends MathType>(...values: T[]): T
+  multiply(...values: MathType[]): MathType
 
   /**
    * Calculate the norm of a number, vector or matrix. The second