Only send in amountAvailableToFill if it's a non-zero amount, add additional tests and nest, and put error into its own file

1 files changed, 16 insertions, 0 deletions

diff --git a/packages/asset-buyer/src/errors.ts b/packages/asset-buyer/src/errors.ts
new file mode 100644
index 000000000..ef05a5d0a
--- /dev/null
+++ b/packages/asset-buyer/src/errors.ts
@@ -0,0 +1,16 @@
+import { BigNumber } from '@0x/utils';
+
+import { AssetBuyerError } from './types';
+
+/**
+ * Error class representing insufficient asset liquidity
+ */
+export class InsufficientAssetLiquidityError extends Error {
+    public amountAvailableToFill?: BigNumber;
+    constructor(amountAvailableToFill?: BigNumber) {
+        super(AssetBuyerError.InsufficientAssetLiquidity);
+        this.amountAvailableToFill = amountAvailableToFill;
+        // Setting prototype so instanceof works.  See https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+        Object.setPrototypeOf(this, InsufficientAssetLiquidityError.prototype);
+    }
+}