tar/dist/esm/get-write-flag.js

tar for node

// Get the appropriate flag to use for creating files
// We use fmap on Windows platforms for files less than
// 512kb.  This is a fairly low limit, but avoids making
// things slower in some cases.  Since most of what this
// library is used for is extracting tarballs of many
// relatively small files in npm packages and the like,
// it can be a big boost on Windows platforms.
import fs from 'fs';
const platform = process.env.__FAKE_PLATFORM__ || process.platform;
const isWindows = platform === 'win32';
/* c8 ignore start */
const { O_CREAT, O_NOFOLLOW, O_TRUNC, O_WRONLY } = fs.constants;
const UV_FS_O_FILEMAP = Number(process.env.__FAKE_FS_O_FILENAME__) ||
    fs.constants.UV_FS_O_FILEMAP ||
    0;
/* c8 ignore stop */
const fMapEnabled = isWindows && !!UV_FS_O_FILEMAP;
const fMapLimit = 512 * 1024;
const fMapFlag = UV_FS_O_FILEMAP | O_TRUNC | O_CREAT | O_WRONLY;
const noFollowFlag = !isWindows && typeof O_NOFOLLOW === 'number' ?
    O_NOFOLLOW | O_TRUNC | O_CREAT | O_WRONLY
    : null;
export const getWriteFlag = noFollowFlag !== null ? () => noFollowFlag
    : !fMapEnabled ? () => 'w'
        : (size) => (size < fMapLimit ? fMapFlag : 'w');
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