1 files changed, 44 insertions, 0 deletions
diff --git a/packages/instant/src/util/assert.ts b/packages/instant/src/util/assert.ts
new file mode 100644
index 000000000..584d3d4b1
--- /dev/null
+++ b/packages/instant/src/util/assert.ts
@@ -0,0 +1,44 @@
+import { assert as sharedAssert } from '@0x/assert';
+import { schemas } from '@0x/json-schemas';
+import { assetDataUtils } from '@0x/order-utils';
+import { AssetProxyId, ObjectMap, SignedOrder } from '@0x/types';
+import * as _ from 'lodash';
+
+import { AssetMetaData } from '../types';
+
+export const assert = {
+    ...sharedAssert,
+    isValidLiquiditySource(variableName: string, liquiditySource: string | SignedOrder[]): void {
+        if (_.isString(liquiditySource)) {
+            sharedAssert.isUri(variableName, liquiditySource);
+            return;
+        }
+        sharedAssert.doesConformToSchema(variableName, liquiditySource, schemas.signedOrdersSchema);
+    },
+    isValidAssetMetaDataMap(variableName: string, metaDataMap: ObjectMap<AssetMetaData>): void {
+        _.forEach(metaDataMap, (metaData, assetData) => {
+            assert.isHexString(`key ${assetData} of ${variableName}`, assetData);
+            assert.isValidAssetMetaData(`${variableName}.${assetData}`, metaData);
+            const assetDataProxyId = assetDataUtils.decodeAssetProxyId(assetData);
+            assert.assert(
+                metaData.assetProxyId === assetDataProxyId,
+                `Expected meta data for assetData ${assetData} to have asset proxy id of ${assetDataProxyId}, but instead got ${
+                    metaData.assetProxyId
+                }`,
+            );
+        });
+    },
+    isValidAssetMetaData(variableName: string, metaData: AssetMetaData): void {
+        assert.isHexString(`${variableName}.assetProxyId`, metaData.assetProxyId);
+        if (!_.isUndefined(metaData.primaryColor)) {
+            assert.isString(`${variableName}.primaryColor`, metaData.primaryColor);
+        }
+        if (metaData.assetProxyId === AssetProxyId.ERC20) {
+            assert.isNumber(`${variableName}.decimals`, metaData.decimals);
+            assert.isString(`${variableName}.symbol`, metaData.symbol);
+        } else if (metaData.assetProxyId === AssetProxyId.ERC721) {
+            assert.isString(`${variableName}.name`, metaData.name);
+            assert.isUri(`${variableName}.imageUrl`, metaData.imageUrl);
+        }
+    },
+};