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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | 4x 4x 7x 7x 7x 7x 7x 7x 7x 4x 2x 2x 2x 2x | import { open, writeFile, close, fdatasync, WriteFileOptions } from "fs";
export interface WriteFileAndFlushOptions {
encoding: BufferEncoding;
mode: string | number | null | undefined;
flag: string;
}
export const writeFileAndFlush = (
path: string,
data: string | NodeJS.ArrayBufferView,
options: WriteFileAndFlushOptions | BufferEncoding,
callback: (err?: NodeJS.ErrnoException | null) => void
) => {
// If options passed in as a string convert to WriteFileAndFlushOptions
const writeOptions: WriteFileOptions =
typeof options === "string"
? { encoding: options, mode: 0o666, flag: "w" }
: {
...options,
mode: options.mode ?? 0o666,
};
// Open the file with same flags and mode as fs.writeFile()
open(path, writeOptions.flag, writeOptions.mode, (openError, fd) => {
Iif (openError) {
return callback(openError);
}
// It is valid to pass a fd handle to fs.writeFile() and this will keep the handle open!
return writeFile(fd, data, writeOptions, (writeError) => {
Iif (writeError) {
return close(fd, () => callback(writeError)); // still need to close the handle on error!
}
// Flush contents (not metadata) of the file to disk
return fdatasync(fd, (syncError) => {
return close(fd, (closeError) => callback(syncError || closeError)); // make sure to carry over the fdatasync error if any!
});
});
});
};
export const writeFileAndFlushAsync = (
path: string,
data: string | NodeJS.ArrayBufferView,
options: WriteFileAndFlushOptions | BufferEncoding = "utf8"
) => {
return new Promise<void>((resolve, reject) => {
writeFileAndFlush(path, data, options, (err) => {
Iif (err) {
return reject(err);
}
return resolve();
});
});
};
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