Implement host API for big decimal equals (#476)

* Implement host api for big decimal equals

* Add test cases for big decimal equals

* Use boolean type conversion

---------

Co-authored-by: neeraj <neeraj.rtly@gmail.com>

packages/graph-node/src/loader.ts

@@ -478,7 +478,23 @@ export const instantiate = async (
 
         return powResultBigDecimal;
       },
+      'bigDecimal.equals': async (x: number, y: number) => {
+        // Create decimal x string.
+        const xBigDecimal = await BigDecimal.wrap(x);
+        const xStringPtr = await xBigDecimal.toString();
+        const xDecimalString = __getString(xStringPtr);
+        const xDecimal = new GraphDecimal(xDecimalString);
 
+        // Create decimal y string.
+        const yBigDecimal = await BigDecimal.wrap(y);
+        const yStringPtr = await yBigDecimal.toString();
+        const yDecimalString = __getString(yStringPtr);
+
+        // Perform the decimal equal operation.
+        const isEqual = xDecimal.equals(yDecimalString);
+
+        return isEqual;
+      },
       'bigInt.fromString': async (s: number) => {
         const string = __getString(s);
 

packages/graph-node/src/numbers.test.ts

@@ -638,4 +638,22 @@ describe('numbers wasm tests', () => {
       expect(__getString(ptr)).to.equal(expected);
     });
   });
+
+  describe('should execute bigDecimal equals API', () => {
+    let testBigDecimalEquals: any, __newString: any;
+
+    before(() => {
+      ({ testBigDecimalEquals, __newString } = exports);
+    });
+
+    it('should check given bigDecimals are equal', async () => {
+      const ptr = await testBigDecimalEquals(await __newString('231543212.2132354'), await __newString('231543212.2132354'));
+      expect(Boolean(ptr)).to.equal(true);
+    });
+
+    it('should check given bigDecimals are not equal', async () => {
+      const ptr = await testBigDecimalEquals(await __newString('231543212.2132354'), await __newString('54652.65645'));
+      expect(Boolean(ptr)).to.equal(false);
+    });
+  });
 });