diff --git a/package-lock.json b/package-lock.json
index abedffa..f91e2ed 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1367,9 +1367,9 @@
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@@ -1380,6 +1380,14 @@
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+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
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+        }
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@@ -1434,14 +1442,13 @@
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+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
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-        "picomatch": "^2.0.4"
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@@ -1616,6 +1623,14 @@
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+        }
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@@ -2094,6 +2109,17 @@
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+          "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
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+          "dev": true,
+          "optional": true,
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@@ -2114,6 +2140,13 @@
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+          "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz",
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@@ -2121,6 +2154,13 @@
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@@ -2643,9 +2683,9 @@
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+      "version": "1.3.565",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.565.tgz",
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@@ -3222,11 +3262,15 @@
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+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
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+      "optional": true,
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+        "nan": "^2.12.1"
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@@ -3940,24 +3984,6 @@
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@@ -4082,38 +4108,6 @@
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@@ -4279,26 +4273,6 @@
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@@ -4464,14 +4438,6 @@
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         "ws": "^5.2.0",
         "xml-name-validator": "^3.0.0"
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@@ -4578,14 +4544,6 @@
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@@ -4664,6 +4622,14 @@
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         "pify": "^4.0.1",
         "semver": "^5.6.0"
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+          "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
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+          "dev": true
+        }
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@@ -5030,11 +4996,13 @@
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@@ -5345,14 +5313,6 @@
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@@ -5382,9 +5342,9 @@
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+      "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+      "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
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@@ -5423,6 +5383,12 @@
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       "dev": true
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+      "version": "1.19.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.19.1.tgz",
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@@ -5754,14 +5720,6 @@
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@@ -5925,27 +5883,6 @@
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@@ -6685,6 +6622,12 @@
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       "dev": true
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+      "version": "3.9.7",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
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+    },
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@@ -6942,29 +6885,6 @@
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@@ -6993,17 +6913,6 @@
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@@ -7037,6 +6946,13 @@
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+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
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@@ -7086,6 +7002,14 @@
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+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
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+          "dev": true
+        }
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@@ -7152,6 +7076,25 @@
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+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
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+          "dev": true,
+          "requires": {
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+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "os-locale": "^3.1.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^2.0.0",
+            "set-blocking": "^2.0.0",
+            "string-width": "^3.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.0"
+          }
         }
       }
     },
@@ -7297,22 +7240,21 @@
       "dev": true
     },
     "yargs": {
-      "version": "13.2.4",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
-      "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
       "requires": {
         "cliui": "^5.0.0",
         "find-up": "^3.0.0",
         "get-caller-file": "^2.0.1",
-        "os-locale": "^3.1.0",
         "require-directory": "^2.1.1",
         "require-main-filename": "^2.0.0",
         "set-blocking": "^2.0.0",
         "string-width": "^3.0.0",
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.0"
+        "yargs-parser": "^13.1.2"
       }
     },
     "yargs-parser": {
diff --git a/package.json b/package.json
index dac280b..9c01f47 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,9 @@
     "prebuild": "npm run clean",
     "build": "webpack",
     "test": "jest --config ./jest.config.js && jest --config ./jest.compiled.config.js",
-    "test:build": "npm run build && npm run test"
+    "test:build": "npm run build && npm run test",
+    "format": "prettier --write '{src,__mocks__,tests}/**/*.{js,json,ts,tsx}'",
+    "check-types": "tsc"
   },
   "repository": {
     "type": "git",
@@ -42,8 +44,16 @@
     "babel-loader": "8.0.6",
     "bignumber.js": "8.1.1",
     "jest": "24.9.0",
+    "prettier": "1.19.1",
+    "typescript": "^3.3.4000",
     "webpack": "4.40.2",
     "webpack-cli": "3.3.9",
     "webpack-node-externals": "1.7.2"
+  },
+  "prettier": {
+    "singleQuote": true,
+    "arrowParens": "always",
+    "tabWidth": 2,
+    "printWidth": 100
   }
 }
diff --git a/src/accounting/helpers.ts b/src/accounting/helpers.ts
index b9d3df7..1fa92e3 100644
--- a/src/accounting/helpers.ts
+++ b/src/accounting/helpers.ts
@@ -2,22 +2,23 @@ import { Map as IMap, List } from 'immutable';
 import moment from 'moment';
 import { BigNumber } from 'bignumber.js';
 
+import { ITransaction } from '../types';
 import { InvalidParamError } from '../errors';
 
-export const transactionIsBuy = (transaction: IMap<any, any>) => {
+export const transactionIsBuy = (transaction: ITransaction) => {
   return transaction.get('side').toUpperCase() !== 'SELL';
 };
 
-export const transactionFeeCode = (transaction: IMap<any, any>) => {
+export const transactionFeeCode = (transaction: ITransaction) => {
   const feeCode = transaction.get('fee_code');
   return feeCode ? feeCode.toUpperCase() : feeCode;
 };
 
-export const transactionHasFee = (transaction: IMap<any, any>) => {
+export const transactionHasFee = (transaction: ITransaction) => {
   return Boolean(transactionFeeCode(transaction)) && Boolean(transaction.get('fee_amount'));
 };
 
-export const transactionUnixNumber = (transaction: IMap<any, any>) => {
+export const transactionUnixNumber = (transaction: ITransaction) => {
   const txMoment = moment.utc(transaction.get('timestamp'), moment.ISO_8601);
   if (!txMoment.isValid()) {
     throw new InvalidParamError(
diff --git a/src/types.ts b/src/types.ts
index bf6b9dd..8938b7a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -83,7 +83,7 @@ export interface TaxRepoortOptionsConfig {
   decimalPlaces: number;
 }
 
-export type Transactions = Array<
+export type Transaction =
   | TradeInput
   | DepositInput
   | WithdrawalInput
@@ -94,8 +94,22 @@ export type Transactions = Array<
   | CompoundRedeemInput
   | CompoundRepayBorrowInput
   | CompoundLiquidateBorrow_BorrowerInput
-  | CompoundLiquidateBorrow_LiquidatorInput
->;
+  | CompoundLiquidateBorrow_LiquidatorInput;
+
+export type Transactions = Transaction[];
+
+export type ITransaction =
+  | Trade
+  | Deposit
+  | Withdrawal
+  | Income
+  | Lost
+  | CompoundMint
+  | CompoundBorrow
+  | CompoundRedeem
+  | CompoundRepayBorrow
+  | CompoundLiquidateBorrow_Borrower
+  | CompoundLiquidateBorrow_Liquidator;
 
 export interface TaxReportOptions {
   transactions: Transactions;