/** Run an npm spawn with 022 added to the process umask, keeping any stricter bits, then put the
 *  previous umask back as soon as the spawn call returns. The child takes its umask when it is
 *  created. Under a umask of 0002, npm makes group-writable directories, files and bin targets,
 *  and its own `--umask` setting leaves package directories and bin targets group-writable. */
export declare function withInstallUmask<T>(spawn: () => T): T;
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