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diff --git a/web/database/types/file-system.js b/web/database/types/file-system.js
new file mode 100644
--- /dev/null
+++ b/web/database/types/file-system.js
@@ -0,0 +1,118 @@
+// @flow
+
+declare interface Emscripten$FileSystemType {}
+
+interface Lookup {
+ +path: string;
+ +node: FSNode;
+}
+
+interface FSStream {}
+
+interface FSNode {}
+
+interface Stats {
+ +[key: string]: mixed;
+}
+
+export interface FS {
+ // paths
+ lookupPath(
+ path: string,
+ opts: { +parent: boolean, +follow: boolean },
+ ): Lookup;
+ getPath(node: FSNode): string;
+
+ // nodes
+ isFile(mode: number): boolean;
+ isDir(mode: number): boolean;
+ isLink(mode: number): boolean;
+ isChrdev(mode: number): boolean;
+ isBlkdev(mode: number): boolean;
+ isFIFO(mode: number): boolean;
+ isSocket(mode: number): boolean;
+
+ // devices
+ major(dev: number): number;
+ minor(dev: number): number;
+ makedev(ma: number, mi: number): number;
+ registerDevice(dev: number, ops: mixed): void;
+
+ // core
+ syncfs(populate: boolean, callback: (e: mixed) => void): void;
+ syncfs(callback: (e: mixed) => void, populate?: boolean): void;
+ mount(
+ type: Emscripten$FileSystemType,
+ opts: { +[key: string]: mixed },
+ mountpoint: string,
+ ): void;
+ unmount(mountpoint: string): void;
+
+ mkdir(path: string, mode?: number): mixed;
+ mkdev(path: string, mode?: number, dev?: number): void;
+ symlink(oldpath: string, newpath: string): void;
+ rename(old_path: string, new_path: string): void;
+ rmdir(path: string): void;
+ readdir(path: string): $ReadOnlyArray<string>;
+ unlink(path: string): void;
+ readlink(path: string): string;
+ stat(path: string, dontFollow?: boolean): Stats;
+ lstat(path: string): Stats;
+ chmod(path: string, mode: number, dontFollow?: boolean): void;
+ lchmod(path: string, mode: number): void;
+ fchmod(fd: number, mode: number): void;
+ chown(path: string, uid: number, gid: number, dontFollow?: boolean): void;
+ lchown(path: string, uid: number, gid: number): void;
+ fchown(fd: number, uid: number, gid: number): void;
+ truncate(path: string, len: number): void;
+ ftruncate(fd: number, len: number): void;
+ utime(path: string, atime: number, mtime: number): void;
+ open(
+ path: string,
+ flags: string,
+ mode?: number,
+ fd_start?: number,
+ fd_end?: number,
+ ): FSStream;
+ close(stream: FSStream): void;
+ llseek(stream: FSStream, offset: number, whence: number): number;
+ read(
+ stream: FSStream,
+ buffer: Uint8Array,
+ offset: number,
+ length: number,
+ position?: number,
+ ): number;
+ write(
+ stream: FSStream,
+ buffer: Uint8Array,
+ offset: number,
+ length: number,
+ position?: number,
+ canOwn?: boolean,
+ ): number;
+ allocate(stream: FSStream, offset: number, length: number): void;
+ readFile(
+ path: string,
+ opts: { +encoding: 'binary', +flags?: ?string },
+ ): Uint8Array;
+ readFile(path: string, opts: { +encoding: 'utf8', +flags?: ?string }): string;
+ writeFile(
+ path: string,
+ data: string | Uint8Array,
+ opts?: { +flags?: ?string },
+ ): void;
+
+ // module-level FS code
+ cwd(): string;
+ chdir(path: string): void;
+ init(
+ input: null | (() => number | null),
+ output: null | ((c: number) => void),
+ error: null | ((c: number) => void),
+ ): void;
+}
+
+declare export var MEMFS: Emscripten$FileSystemType;
+declare export var NODEFS: Emscripten$FileSystemType;
+declare export var IDBFS: Emscripten$FileSystemType;

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