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Last change
on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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| 1 | // Get the appropriate flag to use for creating files
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| 2 | // We use fmap on Windows platforms for files less than
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| 3 | // 512kb. This is a fairly low limit, but avoids making
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| 4 | // things slower in some cases. Since most of what this
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| 5 | // library is used for is extracting tarballs of many
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| 6 | // relatively small files in npm packages and the like,
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| 7 | // it can be a big boost on Windows platforms.
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| 8 | // Only supported in Node v12.9.0 and above.
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| 9 | const platform = process.env.__FAKE_PLATFORM__ || process.platform
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| 10 | const isWindows = platform === 'win32'
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| 11 | const fs = global.__FAKE_TESTING_FS__ || require('fs')
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| 12 |
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| 13 | /* istanbul ignore next */
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| 14 | const { O_CREAT, O_TRUNC, O_WRONLY, UV_FS_O_FILEMAP = 0 } = fs.constants
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| 15 |
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| 16 | const fMapEnabled = isWindows && !!UV_FS_O_FILEMAP
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| 17 | const fMapLimit = 512 * 1024
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| 18 | const fMapFlag = UV_FS_O_FILEMAP | O_TRUNC | O_CREAT | O_WRONLY
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| 19 | module.exports = !fMapEnabled ? () => 'w'
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| 20 | : size => size < fMapLimit ? fMapFlag : 'w'
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