From 999aeadebff91657f1d88242dea53e8bb1a4778e Mon Sep 17 00:00:00 2001
From: ryan-bennett <ryan.bennett.au@gmail.com>
Date: Wed, 17 Mar 2021 09:45:44 +1000
Subject: [PATCH] Added decimaljs.light for item caculation

---
 itemsize.js       |  4 +++-
 package-lock.json | 11 +++++++++++
 package.json      |  1 +
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/itemsize.js b/itemsize.js
index e5c5e7e..6526631 100644
--- a/itemsize.js
+++ b/itemsize.js
@@ -2,6 +2,7 @@ const BASE_LOGICAL_SIZE_OF_NESTED_TYPES = 1
 const LOGICAL_SIZE_OF_EMPTY_DOCUMENT = 3
 const { encode } = require('utf8')
 const atob = require('atob')
+const Decimal = require('decimal.js-light')
 
 // Inspired by https://zaccharles.github.io/dynamodb-calculator/ and adapted for node
 
@@ -31,7 +32,8 @@ const calculateAttributeSizeInBytes = (attribute) => {
 
 const calculateNumberSizeInBytes = (number) => {
   if (number === 0) return 1
-  const fixed = Number.parseFloat(number).toFixed()
+  const decimal = new Decimal(number)
+  const fixed = decimal.toFixed()
   let size = calculateFixedSizeInBytes(fixed.replace('-', '')) + 1
   if (fixed.startsWith('-')) size++
   if (size > 21) size = 21
diff --git a/package-lock.json b/package-lock.json
index ef5319e..6fb4da7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "@aws-sdk/util-dynamodb": "^3.7.0",
         "abstract-leveldown": "^6.3.0",
         "atob": "^2.1.2",
+        "decimal.js-light": "^2.5.1",
         "inherits": "^2.0.1",
         "through2": "^4.0.2",
         "utf8": "^3.0.0"
@@ -4654,6 +4655,11 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/decimal.js-light": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/decimal.js-light/-/decimal.js-light-2.5.1.tgz",
+      "integrity": "sha512-qIMFpTMZmny+MMIitAB6D7iVPEorVw6YQRWkvarTkT4tBeSLLiHzcwj6q0MmYSFCiVpiqPJTJEYIrpcPzVEIvg=="
+    },
     "node_modules/decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
@@ -18945,6 +18951,11 @@
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA="
     },
+    "decimal.js-light": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/decimal.js-light/-/decimal.js-light-2.5.1.tgz",
+      "integrity": "sha512-qIMFpTMZmny+MMIitAB6D7iVPEorVw6YQRWkvarTkT4tBeSLLiHzcwj6q0MmYSFCiVpiqPJTJEYIrpcPzVEIvg=="
+    },
     "decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
diff --git a/package.json b/package.json
index 9e7e0a0..74efe4a 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "@aws-sdk/util-dynamodb": "^3.7.0",
     "abstract-leveldown": "^6.3.0",
     "atob": "^2.1.2",
+    "decimal.js-light": "^2.5.1",
     "inherits": "^2.0.1",
     "through2": "^4.0.2",
     "utf8": "^3.0.0"