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This is the template that rush init generates for the monorepo .npmrc file:


# Rush uses this file to configure the NPM package registry during installation.  It is applicable
# to PNPM, NPM, and Yarn package managers.  It is used by operations such as "rush install",
# "rush update", and the "install-run.js" scripts.
# NOTE: The "rush publish" command uses .npmrc-publish instead.
# Before invoking the package manager, Rush will copy this file to the folder where installation
# is performed.  The copied file will omit any config lines that reference environment variables
# that are undefined in that session; this avoids problems that would otherwise result due to
# a missing variable being replaced by an empty string.
# * * * SECURITY WARNING * * *
# It is NOT recommended to store authentication tokens in a text file on a lab machine, because
# other unrelated processes may be able to read the file.  Also, the file may persist indefinitely,
# for example if the machine loses power.  A safer practice is to pass the token via an
# environment variable, which can be referenced from .npmrc using ${} expansion.  For example:

.npmrc file precedence

Regular Rush operations perform the following lookup:

  1. To support unusual situations, NPM config environment variables take precedence over any .npmrc settings. The environment variable name is prefixed by npm_config_. For example, setting the npm_config_registry variable will override the registry setting in .npmrc. Nonstandard name patterns like npm_config_@example:registry are also accepted by NPM’s design.
  2. Typically settings come from a temporary .npmrc file that Rush copies into the working directory for the operation. The file is copied from common/config/rush/.npmrc, but omitting any lines that reference undefined environment variables (as explained above). For most operations, the working directory will be common/temp.
  3. If the package manager cannot find a setting via 1 or 2, then the user’s ~/.npmrc is consulted. Individual users typically store their authentication tokens in this file.

The above rules also apply for helpers scripts such as install-run.js.

The rush publish command uses a different file .npmrc-publish with its own rules. See this documentation for details.

The above rules do not apply if the package manager is invoked directly (instead of via Rush). For example, npm publish is invoked from the shell, then the package manager’s usual precedence will apply instead. Generally this practice is discouraged in a Rush repo, but if used, you may need to create additional .npmrc files.

See also