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changes.md

File metadata and controls

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This file enumerates the changes that were made to the API surface between the Origin Trial as shipped in Chrome 83, and what is or will be available in Chrome 86.

File Picker API entry points

Before (in Origin Trial)

let file1 = await window.chooseFileSystemEntries(
    {type: 'open-file'});
let files = await window.chooseFileSystemEntries(
    {type: 'open-file', multiple: true});
let file2 = await window.chooseFileSystemEntries(
    {type: 'save-file'});
let dir = window.chooseFileSystemEntries(
    {type: 'open-directory'});

After (in Chrome M86)

let [file1] = await window.showOpenFilePicker();
let files = await window.showOpenFilePicker({multiple: true});
let file2 = await window.showSaveFilePicker();
let dir = await window.showDirectoryPicker();

Specifying accepted file types

Before (in Origin Trial)

await window.chooseFileSystemEntries({
  accepts: [
    {
      description: 'Text Files',
      mimeTypes: ['text/plain', 'text/html'],
      extensions: ['txt', 'text', 'html', 'htm']
    },
    {
      description: 'Images',
      mimeTypes: ['image/*'],
      extensions: ['png', 'gif', 'jpeg', 'jpg']
    }
  ]
});

After (in Chrome M86)

await window.showOpenFilePicker({
  types: [
    {
      description: 'Text Files',
      accept: {
        'text/plain': ['.txt', '.text'],
        'text/html': ['.html', '.htm']
      }
    },
    {
      description: 'Images',
      accept: {
        'image/*': ['.png', '.gif', '.jpeg', '.jpg']
      }
    }
  ]
});

Determining if a handle is a file or directory

Before (in Origin Trial)

if (handle.isFile) {
  // handle is a file
} else if (handle.isDirectory) {
  // handle is a directory
} else {
  // can't happen
}

After (in Chrome M86)

switch (handle.kind) {
  case 'file':
    // handle is a file
    break;
  case 'directory':
    // handle is a directory
    break;
  default:
    // can't happen
}

Getting children of a directory

Before (in Origin Trial)

let file1 = parent.getFile('name');
let file2 = parent.getFile('name2', {create: true});
let dir1 = parent.getDirectory('dir1');
let dir2 = parent.getDirectory('dir2', {create: true});

After (in Chrome M86)

let file1 = parent.getFileHandle('name');
let file2 = parent.getFileHandle('name2', {create: true});
let dir1 = parent.getDirectoryHandle('dir1');
let dir2 = parent.getDirectoryHandle('dir2', {create: true});

Directory iteration

Before (in Origin Trial)

for await (let handle of parent.getEntries()) {
  // Use handle and/or handle.name
}

After (in Chrome M86)

for await (let handle of parent.values()) { /* ... */ }
for await (let [name, handle] of parent) { /* ... */ }
for await (let [name, handle] of parent.entries()) { /* ... */ }
for await (let name of parent.keys()) { /* ... */ }

Changes to permissions

Before (in Origin Trial)

await handle.queryPermission();
await handle.queryPermission({writable: false});
await handle.requestPermission();
await handle.requestPermission({writable: false});

After (in Chrome M86)

await handle.queryPermission();
await handle.queryPermission({mode: 'read'});
await handle.requestPermission();
await handle.requestPermission({mode: 'read'});

Before (in Origin Trial)

await handle.queryPermission({writable: true});
await handle.requestPermission({writable: true});

After (in Chrome M86)

await handle.queryPermission({mode: 'readwrite'});
await handle.requestPermission({mode: 'readwrite'});

Origin Private/Sandboxed File System

Before (in Origin Trial)

let root = await FileSystemDirectoryHandle.getSystemDirectory(type: 'sandbox');

After (in Chrome M86)

let root = await navigator.storage.getDirectory();