SDK: Fix toUnits throwing error for values in scintific notation

Author: MananTank

packages/thirdweb/src/utils/units.test.ts

@@ -199,6 +199,19 @@ describe("toUnits", () => {
     expect(toUnits("69.59000000059", 9)).toMatchInlineSnapshot("69590000001n");
     expect(toUnits("69.59000002359", 9)).toMatchInlineSnapshot("69590000024n");
   });
+
+  it("scientific notation", () => {
+    // negative exponents
+    expect(toUnits("1e-18", 18)).toMatchInlineSnapshot("1n");
+    expect(toUnits("1e-16", 18)).toMatchInlineSnapshot("100n");
+    expect(toUnits("1.23456789012345e-7", 18)).toMatchInlineSnapshot(
+      "123456789012n",
+    );
+    // positive exponents
+    expect(toUnits("1.234e3", 18)).toMatchInlineSnapshot(
+      "1234000000000000000000n",
+    );
+  });
 });
 
 describe("toWei", () => {

packages/thirdweb/src/utils/units.ts

@@ -73,6 +73,10 @@ export function toEther(wei: bigint) {
  * @utils
  */
 export function toUnits(tokens: string, decimals: number): bigint {
+  if (tokens.includes("e")) {
+    tokens = Number(tokens).toFixed(decimals);
+  }
+
   let [integerPart, fractionPart = ""] = tokens.split(".") as [string, string];
   const prefix = integerPart.startsWith("-") ? "-" : "";
   if (prefix) {