improve typing (#105)

* improve typing

* bug fix

* don't test cjs

file.js

@@ -1,6 +1,6 @@
 import Blob from './index.js';
 
-export default class File extends Blob {
+const _File = class File extends Blob {
   #lastModified = 0;
   #name = '';
 
@@ -8,7 +8,7 @@ export default class File extends Blob {
    * @param {*[]} fileBits
    * @param {string} fileName
    * @param {{lastModified?: number, type?: string}} options
-   */ // @ts-ignore
+   */// @ts-ignore
   constructor(fileBits, fileName, options = {}) {
     if (arguments.length < 2) {
       throw new TypeError(`Failed to construct 'File': 2 arguments required, but only ${arguments.length} present.`);
@@ -33,4 +33,6 @@ export default class File extends Blob {
   }
 }
 
-export { File };
+/** @type {typeof globalThis.File} */// @ts-ignore
+export const File = _File;
+export default File;

from.js

@@ -1,8 +1,9 @@
 import {statSync, createReadStream, promises as fs} from 'fs';
 import {basename} from 'path';
+import {MessageChannel} from 'worker_threads';
+
 import File from './file.js';
 import Blob from './index.js';
-import {MessageChannel} from 'worker_threads';
 
 const {stat} = fs;
 
@@ -37,6 +38,7 @@ const fileFrom = (path, type) => stat(path).then(stat => fromFile(stat, path, ty
  */
 const fileFromSync = (path, type) => fromFile(statSync(path), path, type);
 
+// @ts-ignore
 const fromBlob = (stat, path, type = '') => new Blob([new BlobDataItem({
 	path,
 	size: stat.size,
@@ -44,6 +46,7 @@ const fromBlob = (stat, path, type = '') => new Blob([new BlobDataItem({
 	start: 0
 })], {type});
 
+// @ts-ignore
 const fromFile = (stat, path, type = '') => new File([new BlobDataItem({
 	path,
 	size: stat.size,

index.js

@@ -1,6 +1,6 @@
 
 // TODO (jimmywarting): in the feature use conditional loading with top level await (requires 14.x)
-// Node has recently added whatwg stream into core, want to use that instead when it becomes available.
+// Node has recently added whatwg stream into core
 
 import './streams.cjs';
 
@@ -21,8 +21,8 @@ async function * toIterator (parts, clone = true) {
 				while (position !== end) {
 					const size = Math.min(end - position, POOL_SIZE);
 					const chunk = part.buffer.slice(position, position + size);
-					yield new Uint8Array(chunk);
 					position += chunk.byteLength;
+					yield new Uint8Array(chunk);
 				}
 			} else {
 				yield part;
@@ -42,7 +42,7 @@ async function * toIterator (parts, clone = true) {
 	}
 }
 
-export default class Blob {
+const _Blob = class Blob {
 
 	/** @type {Array.<(Blob|Uint8Array)>} */
 	#parts = [];
@@ -69,7 +69,7 @@ export default class Blob {
 			} else if (element instanceof Blob) {
 				part = element;
 			} else {
-				part = new TextEncoder().encode(String(element));
+				part = new TextEncoder().encode(element);
 			}
 
 			size += ArrayBuffer.isView(part) ? part.byteLength : part.size;
@@ -224,10 +224,12 @@ export default class Blob {
 	}
 }
 
-Object.defineProperties(Blob.prototype, {
+Object.defineProperties(_Blob.prototype, {
 	size: {enumerable: true},
 	type: {enumerable: true},
 	slice: {enumerable: true}
 });
 
-export { Blob };
+/** @type {typeof globalThis.Blob} */
+export const Blob = _Blob;
+export default Blob;

streams.cjs

@@ -1,10 +1,12 @@
+/* c8 ignore start */
 // 64 KiB (same size chrome slice theirs blob into Uint8array's)
 const POOL_SIZE = 65536;
 
 if (!globalThis.ReadableStream) {
   try {
-    Object.assign(globalThis, require('streasm/web'))
+    Object.assign(globalThis, require('stream/web'))
   } catch (error) {
+		// TODO: Remove when only supporting node >= 16.5.0
     Object.assign(globalThis, require('web-streams-polyfill/dist/ponyfill.es2018.js'))
   }
 }
@@ -32,3 +34,4 @@ try {
 		}
 	}
 } catch (error) {}
+/* c8 ignore end */

test.js

@@ -350,3 +350,15 @@ test('can slice zero sized blobs', async t => {
 	const txt = await blob.slice(0, 0).text();
 	t.is(txt, '');
 });
+
+test('returns a readable stream', t => {
+	const stream = new File([], '').stream();
+	t.true(typeof stream.getReader === 'function');
+});
+
+test('checking instanceof blob#stream', async t => {
+	// eslint-disable-next-line node/no-unsupported-features/es-syntax
+	const {ReadableStream} = await import('stream/web').catch(_ => import('web-streams-polyfill/dist/ponyfill.es2018.js'));
+	const stream = new File([], '').stream();
+	t.true(stream instanceof ReadableStream);
+});