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Env.ts
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Env.ts
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/**
* Copyright (c) 2018-present, heineiuo.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
type BufferEncoding = "ascii" | "utf8" | "utf-8" | "utf16le" | "ucs2" | "ucs-2" | "base64" | "latin1" | "binary" | "hex";
export interface Stats<T = number> {
isFile(): boolean;
isDirectory(): boolean;
isBlockDevice(): boolean;
isCharacterDevice(): boolean;
isSymbolicLink(): boolean;
isFIFO(): boolean;
isSocket(): boolean;
dev: T;
ino: T;
mode: T;
nlink: T;
uid: T;
gid: T;
rdev: T;
size: T;
blksize: T;
blocks: T;
atimeMs: T;
mtimeMs: T;
ctimeMs: T;
birthtimeMs: T;
atime: Date;
mtime: Date;
ctime: Date;
birthtime: Date;
}
export interface Dirent {
isFile(): boolean;
isDirectory(): boolean;
isBlockDevice(): boolean;
isCharacterDevice(): boolean;
isSymbolicLink(): boolean;
isFIFO(): boolean;
isSocket(): boolean;
name: string;
}
export interface FileHandle {
/**
* Gets the file descriptor for this file handle.
*/
readonly fd: number;
/**
* Asynchronously append data to a file, creating the file if it does not exist. The underlying file will _not_ be closed automatically.
* The `FileHandle` must have been opened for appending.
* @param data The data to write. If something other than a `Buffer` or `Uint8Array` is provided, the value is coerced to a string.
* @param options Either the encoding for the file, or an object optionally specifying the encoding, file mode, and flag.
* If `encoding` is not supplied, the default of `'utf8'` is used.
* If `mode` is not supplied, the default of `0o666` is used.
* If `mode` is a string, it is parsed as an octal integer.
* If `flag` is not supplied, the default of `'a'` is used.
*/
appendFile(data: any, options?: {
encoding?: string | null;
mode?: string | number;
flag?: string | number;
} | string | null): Promise<void>;
/**
* Asynchronous fchown(2) - Change ownership of a file.
*/
chown(uid: number, gid: number): Promise<void>;
/**
* Asynchronous fchmod(2) - Change permissions of a file.
* @param mode A file mode. If a string is passed, it is parsed as an octal integer.
*/
chmod(mode: string | number): Promise<void>;
/**
* Asynchronous fdatasync(2) - synchronize a file's in-core state with storage device.
*/
datasync(): Promise<void>;
/**
* Asynchronous fsync(2) - synchronize a file's in-core state with the underlying storage device.
*/
sync(): Promise<void>;
/**
* Asynchronously reads data from the file.
* The `FileHandle` must have been opened for reading.
* @param buffer The buffer that the data will be written to.
* @param offset The offset in the buffer at which to start writing.
* @param length The number of bytes to read.
* @param position The offset from the beginning of the file from which data should be read. If `null`, data will be read from the current position.
*/
read<TBuffer extends Uint8Array>(buffer: TBuffer, offset?: number | null, length?: number | null, position?: number | null): Promise<{
bytesRead: number;
buffer: TBuffer;
}>;
/**
* Asynchronously reads the entire contents of a file. The underlying file will _not_ be closed automatically.
* The `FileHandle` must have been opened for reading.
* @param options An object that may contain an optional flag.
* If a flag is not provided, it defaults to `'r'`.
*/
readFile(options?: {
encoding?: null;
flag?: string | number;
} | null): Promise<Uint8Array>;
/**
* Asynchronously reads the entire contents of a file. The underlying file will _not_ be closed automatically.
* The `FileHandle` must have been opened for reading.
* @param options An object that may contain an optional flag.
* If a flag is not provided, it defaults to `'r'`.
*/
readFile(options: {
encoding: BufferEncoding;
flag?: string | number;
} | BufferEncoding): Promise<string>;
/**
* Asynchronously reads the entire contents of a file. The underlying file will _not_ be closed automatically.
* The `FileHandle` must have been opened for reading.
* @param options An object that may contain an optional flag.
* If a flag is not provided, it defaults to `'r'`.
*/
readFile(options?: {
encoding?: string | null;
flag?: string | number;
} | string | null): Promise<string | Uint8Array>;
/**
* Asynchronous fstat(2) - Get file status.
*/
stat(): Promise<Stats>;
/**
* Asynchronous ftruncate(2) - Truncate a file to a specified length.
* @param len If not specified, defaults to `0`.
*/
truncate(len?: number): Promise<void>;
/**
* Asynchronously change file timestamps of the file.
* @param atime The last access time. If a string is provided, it will be coerced to number.
* @param mtime The last modified time. If a string is provided, it will be coerced to number.
*/
utimes(atime: string | number | Date, mtime: string | number | Date): Promise<void>;
/**
* Asynchronously writes `buffer` to the file.
* The `FileHandle` must have been opened for writing.
* @param buffer The buffer that the data will be written to.
* @param offset The part of the buffer to be written. If not supplied, defaults to `0`.
* @param length The number of bytes to write. If not supplied, defaults to `buffer.length - offset`.
* @param position The offset from the beginning of the file where this data should be written. If not supplied, defaults to the current position.
*/
write<TBuffer extends Uint8Array>(buffer: TBuffer, offset?: number | null, length?: number | null, position?: number | null): Promise<{
bytesWritten: number;
buffer: TBuffer;
}>;
/**
* Asynchronously writes `string` to the file.
* The `FileHandle` must have been opened for writing.
* It is unsafe to call `write()` multiple times on the same file without waiting for the `Promise`
* to be resolved (or rejected). For this scenario, `fs.createWriteStream` is strongly recommended.
* @param string A string to write. If something other than a string is supplied it will be coerced to a string.
* @param position The offset from the beginning of the file where this data should be written. If not supplied, defaults to the current position.
* @param encoding The expected string encoding.
*/
write(data: any, position?: number | null, encoding?: string | null): Promise<{
bytesWritten: number;
buffer: string;
}>;
/**
* Asynchronously writes data to a file, replacing the file if it already exists. The underlying file will _not_ be closed automatically.
* The `FileHandle` must have been opened for writing.
* It is unsafe to call `writeFile()` multiple times on the same file without waiting for the `Promise` to be resolved (or rejected).
* @param data The data to write. If something other than a `Buffer` or `Uint8Array` is provided, the value is coerced to a string.
* @param options Either the encoding for the file, or an object optionally specifying the encoding, file mode, and flag.
* If `encoding` is not supplied, the default of `'utf8'` is used.
* If `mode` is not supplied, the default of `0o666` is used.
* If `mode` is a string, it is parsed as an octal integer.
* If `flag` is not supplied, the default of `'w'` is used.
*/
writeFile(data: any, options?: {
encoding?: string | null;
mode?: string | number;
flag?: string | number;
} | string | null): Promise<void>;
/**
* Asynchronous close(2) - close a `FileHandle`.
*/
close(): Promise<void>;
}
export interface Env {
onExit(callback: () => void): void;
platform(): string;
// get current time
now(): number;
access(dbpath: string): Promise<void>;
mkdir(dbpath: string): Promise<void>;
rename(oldpath: string, newpath: string): Promise<void>;
readFile(dbpath: string): Promise<Uint8Array>;
readFile(dbpath: string, options?: {
encoding?: string;
}): Promise<string | Uint8Array>;
readFile(dbpath: string, bufferEncoding: "utf8"): Promise<string>;
writeFile(dbpath: string, content: Uint8Array | string): Promise<void>;
open(dbpath: string, flag: string): Promise<FileHandle>;
unlink(filename: string): Promise<void>;
unlinkSync(filename: string): void;
fstat(fd: FileHandle): Promise<Stats>;
readdir(dbpath: string): Promise<Dirent[]>;
getFileSize(filename: string): Promise<number>;
}