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Update LocalFolder removal behavior #856

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Update expected behavior when .remove() and .removeEntry() methods are used on a LocalFolder directory handle and handles to its contents

@LuHuangMSFT
Update removal behavior
b61d7ec 
Update expected behavior when .remove() and .removeEntry() methods are used on a LocalFolder directory handle and handles to its contents
@LuHuangMSFT LuHuangMSFT self-assigned this Aug 27, 2024
@LuHuangMSFT LuHuangMSFT added the LocalFolder Access Store PWA access to LocalFolder storage label Aug 27, 2024
HowardWolosky
HowardWolosky requested changes Aug 28, 2024
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Some questions/clarifications on these updates

LocalFolder/explainer.md Outdated
| `.removeEntry(...)` on OPFS root handle, selecting `LocalFolder`'s name| Will clear `LocalFolder` contents but leave the `LocalFolder` directory unchanged. |
| `.remove()` on `LocalFolder`'s handle | Will clear `LocalFolder` contents but leave the `LocalFolder` directory unchanged. |
| `.remove()` on OPFS root handle | Will not enumerate or clear `LocalFolder` even if the [`recursive`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry#recursive) option is used. |
| `.removeEntry(...)` on OPFS root handle, selecting `LocalFolder`'s name| Will not enumerate or clear `LocalFolder` even if the `recursive` option is used. |
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Will it throw an exception? What happens?

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Added a line saying no exception will be thrown.

LocalFolder/explainer.md Outdated
@@ -74,7 +74,9 @@ The LocalFolder entry within the OPFS root directory can be found under the name

#### Deletion

A `FileSystemHandle` to `LocalFolder` or its contents will allow their [`remove()`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/remove) and [`removeEntry(...)`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry) methods to successfully delete files and directories. Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.
Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.
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Will you clarify here if an exception is thrown if the LocalFolder entry is attempted to be deleted?

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Documented in table. Reorganized to bring table up to this section. Added link to examples below.

LocalFolder/explainer.md Outdated
A `FileSystemHandle` to `LocalFolder` or its contents will allow their [`remove()`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/remove) and [`removeEntry(...)`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry) methods to successfully delete files and directories. Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.
Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.

Both [`FileSystemHandle: remove()`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/remove) and [`FileSystemDirectoryHandle: removeEntry(...)`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry) methods can be used on child handles to delete files and directories within the `LocalFolder` directory. Only `FileSystemDirectoryHandle: removeEntry(...)` should be used on the `LocalFolder` root directory handle.
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What benefit is gained from calling removeEntry on LocalFolder?

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Removed this paragraph as it offers no additional information. There is no benefit to calling removeEntry on LocalFolder vs. iterating handles under LocalFolder and calling remove() on each.

LuHuangMSFT
LuHuangMSFT commented Oct 5, 2024
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Addressed feedback

LocalFolder/explainer.md Outdated
@@ -74,7 +74,9 @@ The LocalFolder entry within the OPFS root directory can be found under the name

#### Deletion

A `FileSystemHandle` to `LocalFolder` or its contents will allow their [`remove()`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/remove) and [`removeEntry(...)`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry) methods to successfully delete files and directories. Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.
Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.
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Documented in table. Reorganized to bring table up to this section. Added link to examples below.

LocalFolder/explainer.md Outdated
A `FileSystemHandle` to `LocalFolder` or its contents will allow their [`remove()`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/remove) and [`removeEntry(...)`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry) methods to successfully delete files and directories. Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.
Contents in `LocalFolder` can be deleted while the `LocalFolder` entry cannot itself be deleted - this is to mimic the effects of the WinRT [`ClearAsync(...)`](https://learn.microsoft.com/en-us/uwp/api/windows.storage.applicationdata.clearasync?view=winrt-22621#windows-storage-applicationdata-clearasync(windows-storage-applicationdatalocality)) API.

Both [`FileSystemHandle: remove()`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemHandle/remove) and [`FileSystemDirectoryHandle: removeEntry(...)`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry) methods can be used on child handles to delete files and directories within the `LocalFolder` directory. Only `FileSystemDirectoryHandle: removeEntry(...)` should be used on the `LocalFolder` root directory handle.
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Removed this paragraph as it offers no additional information. There is no benefit to calling removeEntry on LocalFolder vs. iterating handles under LocalFolder and calling remove() on each.

LocalFolder/explainer.md Outdated
| `.removeEntry(...)` on OPFS root handle, selecting `LocalFolder`'s name| Will clear `LocalFolder` contents but leave the `LocalFolder` directory unchanged. |
| `.remove()` on `LocalFolder`'s handle | Will clear `LocalFolder` contents but leave the `LocalFolder` directory unchanged. |
| `.remove()` on OPFS root handle | Will not enumerate or clear `LocalFolder` even if the [`recursive`](https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle/removeEntry#recursive) option is used. |
| `.removeEntry(...)` on OPFS root handle, selecting `LocalFolder`'s name| Will not enumerate or clear `LocalFolder` even if the `recursive` option is used. |
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Added a line saying no exception will be thrown.

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@Amax662 Amax662 Amax662 approved these changes

@diekus diekus Awaiting requested review from diekus

@HowardWolosky HowardWolosky Awaiting requested review from HowardWolosky

@kyerebo kyerebo Awaiting requested review from kyerebo

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