fix: some cleanup

lib/fetch/body.js

@@ -276,7 +276,7 @@ const methods = {
         throw new TypeError('locked')
       }
 
-      // NOTE: stream.isDisturbed hasn't landed on Node 16.x yet.
+      // Compat.
       stream[kBodyUsed] = true
 
       for await (const chunk of stream) {

lib/fetch/file.js

@@ -67,7 +67,11 @@ class File extends Blob {
   }
 
   get [Symbol.toStringTag] () {
-    return 'File'
+    if (!(this instanceof File)) {
+      throw new TypeError('Illegal invocation')
+    }
+
+    return this.constructor.name
   }
 }
 

lib/fetch/formdata.js

@@ -20,16 +20,19 @@ class FormData {
     if (!(this instanceof FormData)) {
       throw new TypeError('Illegal invocation')
     }
+
     if (args.length < 2) {
       throw new TypeError(
         `Failed to execute 'append' on 'FormData': 2 arguments required, but only ${args.length} present.`
       )
     }
+
     if (args.length === 3 && !isBlobLike(args[1])) {
       throw new TypeError(
         "Failed to execute 'append' on 'FormData': parameter 2 is not of type 'Blob'"
       )
     }
+
     const name = toUSVString(args[0])
     const filename = args.length === 3 ? toUSVString(args[2]) : undefined
 
@@ -48,11 +51,13 @@ class FormData {
     if (!(this instanceof FormData)) {
       throw new TypeError('Illegal invocation')
     }
+
     if (args.length < 1) {
       throw new TypeError(
         `Failed to execute 'delete' on 'FormData': 1 arguments required, but only ${args.length} present.`
       )
     }
+
     const name = toUSVString(args[0])
 
     // The delete(name) method steps are to remove all entries whose name
@@ -71,11 +76,13 @@ class FormData {
     if (!(this instanceof FormData)) {
       throw new TypeError('Illegal invocation')
     }
+
     if (args.length < 1) {
       throw new TypeError(
         `Failed to execute 'get' on 'FormData': 1 arguments required, but only ${args.length} present.`
       )
     }
+
     const name = toUSVString(args[0])
 
     // 1. If there is no entry whose name is name in this’s entry list,
@@ -94,11 +101,13 @@ class FormData {
     if (!(this instanceof FormData)) {
       throw new TypeError('Illegal invocation')
     }
+
     if (args.length < 1) {
       throw new TypeError(
         `Failed to execute 'getAll' on 'FormData': 1 arguments required, but only ${args.length} present.`
       )
     }
+
     const name = toUSVString(args[0])
 
     // 1. If there is no entry whose name is name in this’s entry list,
@@ -114,11 +123,13 @@ class FormData {
     if (!(this instanceof FormData)) {
       throw new TypeError('Illegal invocation')
     }
+
     if (args.length < 1) {
       throw new TypeError(
         `Failed to execute 'has' on 'FormData': 1 arguments required, but only ${args.length} present.`
       )
     }
+
     const name = toUSVString(args[0])
 
     // The has(name) method steps are to return true if there is an entry
@@ -130,11 +141,13 @@ class FormData {
     if (!(this instanceof FormData)) {
       throw new TypeError('Illegal invocation')
     }
+
     if (args.length < 2) {
       throw new TypeError(
         `Failed to execute 'set' on 'FormData': 2 arguments required, but only ${args.length} present.`
       )
     }
+
     if (args.length === 3 && !isBlobLike(args[1])) {
       throw new TypeError(
         "Failed to execute 'set' on 'FormData': parameter 2 is not of type 'Blob'"
@@ -169,22 +182,38 @@ class FormData {
   }
 
   get [Symbol.toStringTag] () {
-    return 'FormData'
+    if (!(this instanceof FormData)) {
+      throw new TypeError('Illegal invocation')
+    }
+
+    return this.constructor.name
   }
 
   * entries () {
+    if (!(this instanceof FormData)) {
+      throw new TypeError('Illegal invocation')
+    }
+
     for (const pair of this) {
       yield pair
     }
   }
 
   * keys () {
+    if (!(this instanceof FormData)) {
+      throw new TypeError('Illegal invocation')
+    }
+
     for (const [key] of this) {
       yield key
     }
   }
 
   * values () {
+    if (!(this instanceof FormData)) {
+      throw new TypeError('Illegal invocation')
+    }
+
     for (const [, value] of this) {
       yield value
     }
@@ -214,7 +243,7 @@ function makeEntry (name, value, filename) {
 
   // 3. If value is a Blob object and not a File object, then set value to a new File
   // object, representing the same bytes, whose name attribute value is "blob".
-  if (isBlobLike(value) && !(isFileLike(value))) {
+  if (isBlobLike(value) && !isFileLike(value)) {
     value = value instanceof Blob
       ? new File([value], 'blob')
       : new FileLike(value, 'blob')
@@ -227,7 +256,7 @@ function makeEntry (name, value, filename) {
   // Do we just override the name attribute? Since it says "if value is (now)"
   // does that mean that this lives inside the previous condition? In which case
   // creating one more File instance doesn't make much sense....
-  if (isFileLike(value) && filename) {
+  if (isFileLike(value) && filename != null) {
     value = value instanceof File
       ? new File([value], filename)
       : new FileLike(value, filename)

test/fetch/file.js

@@ -5,6 +5,6 @@ const { File, FileLike } = require('../../lib/fetch/file')
 
 test('Symbol.toStringTag', (t) => {
   t.plan(2)
-  t.equal(File.prototype[Symbol.toStringTag], 'File')
-  t.equal(FileLike.prototype[Symbol.toStringTag], 'File')
+  t.equal(new File()[Symbol.toStringTag], 'File')
+  t.equal(new FileLike()[Symbol.toStringTag], 'File')
 })