feat: non-bufferring multipart body encoder

packages/ipfs-core-utils/package.json

@@ -11,6 +11,9 @@
     "src",
     "dist"
   ],
+  "browser": {
+    "./src/files/blob.js": "./src/files/blob.browser.js"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/ipfs/js-ipfs.git"
@@ -31,7 +34,8 @@
     "buffer": "^5.6.0",
     "cids": "^0.8.3",
     "err-code": "^2.0.0",
-    "ipfs-utils": "^2.2.2"
+    "ipfs-utils": "^2.2.2",
+    "web-file-polyfill": "^1.0.0"
   },
   "devDependencies": {
     "aegir": "^23.0.0",
@@ -41,4 +45,4 @@
     "dirty-chai": "^2.0.1",
     "it-all": "^1.0.1"
   }
-}
+}

packages/ipfs-core-utils/src/files/blob.browser.js

@@ -0,0 +1,25 @@
+// @ts-check
+'use strict'
+/* eslint-env browser */
+
+exports.Blob = Blob
+exports.File = File
+
+/**
+ * Universal blob reading function
+ * @param {Blob} blob
+ * @returns {AsyncIterable<Uint8Array>}
+ */
+const readBlob = async function * (blob) {
+  const { body } = new Response(blob)
+  const reader = body.getReader()
+  while (true) {
+    const next = await reader.read()
+    if (next.done) {
+      return
+    } else {
+      yield next.value
+    }
+  }
+}
+exports.readBlob = readBlob

packages/ipfs-core-utils/src/files/blob.js

@@ -0,0 +1,11 @@
+// @ts-check
+'use strict'
+
+// Electron in  renderer process has native `Blob` but it would not pick up
+// browser override. Therefor we do the runtime check and pick browser verison
+// if native Blob is available and node polyfill otherwise.
+if (typeof Blob === 'function') {
+  module.exports = require('./blob.browser')
+} else {
+  module.exports = require('./blob.node')
+}

packages/ipfs-core-utils/src/files/blob.node.js

@@ -0,0 +1,18 @@
+// @ts-check
+'use strict'
+
+const { Blob, File } = require('web-file-polyfill')
+
+/**
+ * Universal blob reading function
+ * @param {InstanceType<typeof window.Blob>} blob
+ * @returns {AsyncIterable<Uint8Array>}
+ */
+// eslint-disable-next-line require-await
+const readBlob = async function * BlobParts (blob) {
+  // @ts-ignore - https://github.com/microsoft/TypeScript/issues/29867
+  yield * blob.stream()
+}
+exports.readBlob = readBlob
+exports.Blob = Blob
+exports.File = File