feat: update streaming dependencies to support react-native (#895)

Author: AllanZhengYP

Diff for: packages/chunked-blob-reader-rn/.gitignore

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+/node_modules/
+/build/
+/coverage/
+/docs/
+*.tsbuildinfo
+*.tgz
+*.log
+package-lock.json

Diff for: packages/chunked-blob-reader-rn/.npmignore

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

Diff for: packages/chunked-blob-reader-rn/LICENSE

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Diff for: packages/chunked-blob-reader-rn/README.md

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+# @aws-sdk/chunked-blob-reader-rn
+
+[![NPM version](https://img.shields.io/npm/v/@aws-sdk/chunked-blob-reader-rn/preview.svg)](https://www.npmjs.com/package/@aws-sdk/chunked-blob-reader-rn)
+[![NPM downloads](https://img.shields.io/npm/dm/@aws-sdk/chunked-blob-reader-rn.svg)](https://www.npmjs.com/package/@aws-sdk/chunked-blob-reader-rn)

Diff for: packages/chunked-blob-reader-rn/jest.config.js

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

Diff for: packages/chunked-blob-reader-rn/package.json

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+{
+  "name": "@aws-sdk/chunked-blob-reader-rn",
+  "version": "1.0.0-alpha.0",
+  "scripts": {
+    "prepublishOnly": "tsc",
+    "pretest": "tsc -p tsconfig.test.json",
+    "test": "jest"
+  },
+  "main": "./build/index.js",
+  "types": "./build/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",
+    "@aws-sdk/util-base64-browser": "^1.0.0-alpha.2"
+  },
+  "devDependencies": {
+    "@types/jest": "^24.0.12",
+    "jest": "^24.7.1",
+    "typescript": "~3.4.0"
+  }
+}

Diff for: packages/chunked-blob-reader-rn/src/index.spec.ts

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+import { blobReader } from "./index";
+
+describe("blobReader", () => {
+  it("reads an entire blob", async () => {
+    const longMessage: number[] = [];
+    for (let i = 0; i < 1024 * 1024 * 5; i += 4) {
+      longMessage.push(102, 111, 111, 32); // 'foo '
+    }
+    const blob = new Blob([Uint8Array.from(longMessage)]);
+
+    let totalBytes = 0;
+
+    await blobReader(blob, chunk => {
+      totalBytes += chunk.byteLength;
+    });
+
+    expect(totalBytes).toBe(1024 * 1024 * 5);
+  });
+
+  it("respects the chunk size", async () => {
+    const message = new Uint8Array(100);
+    message.fill(0);
+
+    const blob = new Blob([message]);
+
+    const chunkSizes: number[] = [];
+
+    await blobReader(
+      blob,
+      chunk => {
+        chunkSizes.push(chunk.byteLength);
+      },
+      12 // chunk size in bytes
+    );
+
+    expect(chunkSizes.length).toBe(9);
+
+    for (let i = 0; i < chunkSizes.length; i++) {
+      if (i < chunkSizes.length - 1) {
+        expect(chunkSizes[i]).toBe(12);
+      } else {
+        expect(chunkSizes[i]).toBe(4);
+      }
+    }
+  });
+});

Diff for: packages/chunked-blob-reader-rn/src/index.ts

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+import { fromBase64 } from "@aws-sdk/util-base64-browser";
+export function blobReader(
+  blob: Blob,
+  onChunk: (chunk: Uint8Array) => void,
+  chunkSize: number = 1024 * 1024
+): Promise<void> {
+  return new Promise((resolve, reject) => {
+    const fileReader = new FileReader();
+
+    fileReader.onerror = reject;
+    fileReader.onabort = reject;
+
+    const size = blob.size;
+    let totalBytesRead = 0;
+
+    const read = () => {
+      if (totalBytesRead >= size) {
+        resolve();
+        return;
+      }
+      fileReader.readAsDataURL(
+        blob.slice(totalBytesRead, Math.min(size, totalBytesRead + chunkSize))
+      );
+    };
+
+    fileReader.onload = event => {
+      const result = (event.target as any).result;
+      // reference: https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL
+      // response from readAsDataURL is always prepended with "data:*/*;base64,"
+      const dataOffset = result.indexOf(",") + 1;
+      const data = result.substring(dataOffset);
+      const decoded = fromBase64(data);
+      onChunk(decoded);
+      totalBytesRead += decoded.byteLength;
+      // read the next block
+      read();
+    };
+
+    // kick off the read
+    read();
+  });
+}

Diff for: packages/chunked-blob-reader-rn/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "commonjs",
+    "declaration": true,
+    "strict": true,
+    "sourceMap": true,
+    "downlevelIteration": true,
+    "importHelpers": true,
+    "noEmitHelpers": true,
+    "lib": [
+      "dom",
+      "es5",
+      "es2015.promise",
+      "es2015.collection",
+      "es2015.iterable",
+      "es2015.symbol.wellknown"
+    ],
+    "rootDir": "./src",
+    "outDir": "./build",
+    "incremental": true
+  }
+}

Diff for: packages/chunked-blob-reader-rn/tsconfig.test.json

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+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "sourceMap": false,
+    "inlineSourceMap": true,
+    "inlineSources": true,
+    "rootDir": "./src",
+    "outDir": "./build",
+    "incremental": true
+  }
+}