feat(util-dynamodb): marshall to convert JavaScript object into DynamoDB Record

packages/util-dynamodb/.gitignore

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packages/util-dynamodb/.npmignore

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+/coverage/
+/docs/
+tsconfig.test.json
+*.tsbuildinfo
+
+*.spec.js
+*.spec.d.ts
+*.spec.js.map
+
+*.fixture.js
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+*.fixture.js.map

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packages/util-dynamodb/README.md

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+# @aws-sdk/util-dynamodb
+
+[![NPM version](https://img.shields.io/npm/v/@aws-sdk/util-dynamodb/beta.svg)](https://www.npmjs.com/package/@aws-sdk/util-dynamodb)
+[![NPM downloads](https://img.shields.io/npm/dm/@aws-sdk/util-dynamodb.svg)](https://www.npmjs.com/package/@aws-sdk/util-dynamodb)
+
+This package provides utilities to be used with `@aws-sdk/client-dynamodb`
+
+## Convert JavaScript object into DynamoDB Record
+
+```js
+const { DynamoDB } = require("@aws-sdk/client-dynamodb");
+const { marshall } = require("@aws-sdk/util-dynamodb");
+
+const client = new DynamoDB(clientParams);
+const params = {
+  TableName: "Table",
+  Item: marshall({
+    HashKey: "hashKey",
+    NumAttribute: 1,
+    BoolAttribute: true,
+    ListAttribute: [1, "two", false],
+    MapAttribute: { foo: "bar" },
+    NullAttribute: null,
+  }),
+};
+
+await client.putItem(params);
+```

packages/util-dynamodb/jest.config.js

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+const base = require("../../jest.config.base.js");
+
+module.exports = {
+  ...base,
+};

packages/util-dynamodb/package.json

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+{
+  "name": "@aws-sdk/util-dynamodb",
+  "version": "1.0.0-gamma.0",
+  "scripts": {
+    "prepublishOnly": "yarn build:cjs && yarn build:es",
+    "pretest": "yarn build:cjs",
+    "build:cjs": "tsc -p tsconfig.cjs.json",
+    "build:es": "tsc -p tsconfig.es.json",
+    "build": "yarn build:es && yarn build:cjs",
+    "test": "jest"
+  },
+  "main": "./dist/cjs/index.js",
+  "module": "./dist/es/index.js",
+  "types": "./dist/cjs/index.d.ts",
+  "author": {
+    "name": "AWS SDK for JavaScript Team",
+    "url": "https://aws.amazon.com/javascript/"
+  },
+  "license": "Apache-2.0",
+  "dependencies": {
+    "tslib": "^1.8.0"
+  },
+  "devDependencies": {
+    "@aws-sdk/client-dynamodb": "1.0.0-gamma.9",
+    "@types/jest": "^26.0.4",
+    "jest": "^26.1.0",
+    "typescript": "~4.0.2"
+  }
+}