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Repository rules to fetch third-party npm packages

Load these with,

load("@aspect_rules_js//npm:npm_import.bzl", "npm_translate_lock", "npm_import")

These use Bazel's downloader to fetch the packages. You can use this to redirect all fetches through a store like Artifactory.

See <https://blog.aspect.dev/configuring-bazels-downloader> for more info about how it works and how to configure it.

npm_translate_lock is the primary user-facing API. It uses the lockfile format from pnpm because it gives us reliable semantics for how to dynamically lay out node_modules trees on disk in bazel-out.

To create pnpm-lock.yaml, consider using pnpm import to preserve the versions pinned by your existing package-lock.json or yarn.lock file.

If you don't have an existing lock file, you can run npx pnpm install --lockfile-only.

Advanced users may want to directly fetch a package from npm rather than start from a lockfile. npm_import does this.

npm_import

npm_import(name, package, version, deps, extra_build_content, transitive_closure, root_package,
           link_workspace, link_packages, lifecycle_hooks, lifecycle_hooks_execution_requirements,
           lifecycle_hooks_env, integrity, url, commit, patch_args, patches, custom_postinstall,
           npm_auth, npm_auth_basic, npm_auth_username, npm_auth_password, bins, run_lifecycle_hooks,
           lifecycle_hooks_no_sandbox, kwargs)

Import a single npm package into Bazel.

Normally you'd want to use npm_translate_lock to import all your packages at once. It generates npm_import rules. You can create these manually if you want to have exact control.

Bazel will only fetch the given package from an external registry if the package is required for the user-requested targets to be build/tested.

This is a repository rule, which should be called from your WORKSPACE file or some .bzl file loaded from it. For example, with this code in WORKSPACE:

npm_import(
    name = "npm__at_types_node_15.12.2",
    package = "@types/node",
    version = "15.12.2",
    integrity = "sha512-zjQ69G564OCIWIOHSXyQEEDpdpGl+G348RAKY0XXy9Z5kU9Vzv1GMNnkar/ZJ8dzXB3COzD9Mo9NtRZ4xfgUww==",
)

> This is similar to Bazel rules in other ecosystems named "_import" like > apple_bundle_import, scala_import, java_import, and py_import. > go_repository is also a model for this rule.

The name of this repository should contain the version number, so that multiple versions of the same package don't collide. (Note that the npm ecosystem always supports multiple versions of a library depending on where it is required, unlike other languages like Go or Python.)

To consume the downloaded package in rules, it must be "linked" into the link package in the package's BUILD.bazel file:

load("@npm__at_types_node__15.12.2__links//:defs.bzl", npm_link_types_node = "npm_link_imported_package")

npm_link_types_node(name = "node_modules")

This links @types/node into the node_modules of this package with the target name :node_modules/@types/node.

A :node_modules/@types/node/dir filegroup target is also created that provides the the directory artifact of the npm package. This target can be used to create entry points for binary target or to access files within the npm package.

NB: You can choose any target name for the link target but we recommend using the node_modules/@scope/name and node_modules/name convention for readability.

When using npm_translate_lock, you can link all the npm dependencies in the lock file for a package:

load("@npm//:defs.bzl", "npm_link_all_packages")

npm_link_all_packages(name = "node_modules")

This creates :node_modules/name and :node_modules/@scope/name targets for all direct npm dependencies in the package. It also creates :node_modules/name/dir and :node_modules/@scope/name/dir filegroup targets that provide the the directory artifacts of their npm packages. These target can be used to create entry points for binary target or to access files within the npm package.

If you have a mix of npm_link_all_packages and npm_link_imported_package functions to call you can pass the npm_link_imported_package link functions to the imported_links attribute of npm_link_all_packages to link them all in one call. For example,

load("@npm//:defs.bzl", "npm_link_all_packages")
load("@npm__at_types_node__15.12.2__links//:defs.bzl", npm_link_types_node = "npm_link_imported_package")

npm_link_all_packages(
    name = "node_modules",
    imported_links = [
        npm_link_types_node,
    ]
)

This has the added benefit of adding the imported_links to the convienence :node_modules target which includes all direct dependencies in that package.

NB: You can pass an name to npm_link_all_packages and this will change the targets generated to "{name}/@scope/name" and "{name}/name". We recommend using "node_modules" as the convention for readability.

To change the proxy URL we use to fetch, configure the Bazel downloader:

  1. Make a file containing a rewrite rule like

    rewrite (registry.nodejs.org)/(.*) artifactory.build.internal.net/artifactory/$1/$2

  2. To understand the rewrites, see UrlRewriterConfig in Bazel sources.

  3. Point bazel to the config with a line in .bazelrc like common --experimental_downloader_config=.bazel_downloader_config

Read more about the downloader config: <https://blog.aspect.dev/configuring-bazels-downloader>

PARAMETERS

Name Description Default Value
name Name for this repository rule none
package Name of the npm package, such as acorn or @types/node none
version Version of the npm package, such as 8.4.0 none
deps A dict other npm packages this one depends on where the key is the package name and value is the version {}
extra_build_content Additional content to append on the generated BUILD file at the root of the created repository, either as a string or a list of lines similar to <https://github.com/bazelbuild/bazel-skylib/blob/main/docs/write_file_doc.md>. ""
transitive_closure A dict all npm packages this one depends on directly or transitively where the key is the package name and value is a list of version(s) depended on in the closure. {}
root_package The root package where the node_modules virtual store is linked to. Typically this is the package that the pnpm-lock.yaml file is located when using npm_translate_lock. ""
link_workspace The workspace name where links will be created for this package.

This is typically set in rule sets and libraries that are to be consumed as external repositories so links are created in the external repository and not the user workspace.

Can be left unspecified if the link workspace is the user workspace.		 ""
link_packages Dict of paths where links may be created at for this package to a list of link aliases to link as in each package. If aliases are an empty list this indicates to link as the package name.

Defaults to {} which indicates that links may be created in any package as specified by the direct attribute of the generated npm_link_package.		 {}
lifecycle_hooks List of lifecycle hook package.json scripts to run for this package if they exist. []
lifecycle_hooks_execution_requirements Execution requirements when running the lifecycle hooks.

For example:

 lifecycle_hooks_execution_requirements: ["no-sandbox', "requires-network"]


This defaults to ["no-sandbox"] to limit the overhead of sandbox creation and copying the output TreeArtifact out of the sandbox.		 ["no-sandbox"]
lifecycle_hooks_env Environment variables set for the lifecycle hooks action for this npm package if there is one.

Environment variables are defined by providing an array of "key=value" entries.

For example:

 lifecycle_hooks_env: ["PREBULT_BINARY=https://downloadurl"],
[]
integrity Expected checksum of the file downloaded, in Subresource Integrity format. This must match the checksum of the file downloaded.

This is the same as appears in the pnpm-lock.yaml, yarn.lock or package-lock.json file.

It is a security risk to omit the checksum as remote files can change.

At best omitting this field will make your build non-hermetic.

It is optional to make development easier but should be set before shipping.		 ""
url Optional url for this package. If unset, a default npm registry url is generated from the package name and version.

May start with git+ssh:// to indicate a git repository. For example,

 git+ssh://git@github.com/org/repo.git


If url is configured as a git repository, the commit attribute must be set to the desired commit.		 ""
commit Specific commit to be checked out if url is a git repository. ""
patch_args Arguments to pass to the patch tool.

-p1 will usually be needed for patches generated by git.		 ["-p0"]
patches Patch files to apply onto the downloaded npm package. []
custom_postinstall Custom string postinstall script to run on the installed npm package. Runs after any existing lifecycle hooks if run_lifecycle_hooks is True. ""
npm_auth Auth token to authenticate with npm. When using Bearer authentication. ""
npm_auth_basic Auth token to authenticate with npm. When using Basic authentication.

This is typically the base64 encoded string "username:password".		 ""
npm_auth_username Auth username to authenticate with npm. When using Basic authentication. ""
npm_auth_password Auth password to authenticate with npm. When using Basic authentication. ""
bins Dictionary of node_modules/.bin binary files to create mapped to their node entry points.

This is typically derived from the "bin" attribute in the package.json file of the npm package being linked.

For example:

 bins = {     "foo": "./foo.js",     "bar": "./bar.js", }


In the future, this field may be automatically populated by npm_translate_lock from information in the pnpm lock file. That feature is currently blocked on pnpm/pnpm#5131.		 {}
run_lifecycle_hooks If True, runs preinstall, install, postinstall and 'prepare' lifecycle hooks declared in this package.

Deprecated. Use lifecycle_hooks instead.		 None
lifecycle_hooks_no_sandbox If True, adds "no-sandbox" to lifecycle_hooks_execution_requirements.

Deprecated. Add "no-sandbox" to lifecycle_hooks_execution_requirements instead.		 None
kwargs Internal use only none

npm_translate_lock

npm_translate_lock(name, pnpm_lock, npm_package_lock, yarn_lock, update_pnpm_lock, preupdate, npmrc,
                   use_home_npmrc, data, patches, patch_args, custom_postinstalls, prod,
                   public_hoist_packages, dev, no_optional, run_lifecycle_hooks, lifecycle_hooks,
                   lifecycle_hooks_envs, lifecycle_hooks_exclude,
                   lifecycle_hooks_execution_requirements, lifecycle_hooks_no_sandbox, bins,
                   verify_node_modules_ignored, quiet, link_workspace, pnpm_version, package_json,
                   warn_on_unqualified_tarball_url, kwargs)

Repository macro to generate starlark code from a lock file.

In most repositories, it would be an impossible maintenance burden to manually declare all of the npm_import rules. This helper generates an external repository containing a helper starlark module repositories.bzl, which supplies a loadable macro npm_repositories. That macro creates an npm_import for each package.

The generated repository also contains BUILD files declaring targets for the packages listed as dependencies or devDependencies in package.json, so you can declare dependencies on those packages without having to repeat version information.

This macro creates a pnpm external repository, if the user didn't create a repository named "pnpm" prior to calling npm_translate_lock. rules_js currently only uses this repository when npm_package_lock or yarn_lock are used. Set pnpm_version to None to inhibit this repository creation.

For more about how to use npm_translate_lock, read pnpm and rules_js.

PARAMETERS

Name Description Default Value
name The repository rule name none
pnpm_lock The pnpm-lock.yaml file. None
npm_package_lock The package-lock.json file written by npm install.

Only one of npm_package_lock or yarn_lock may be set.		 None
yarn_lock The yarn.lock file written by yarn install.

Only one of npm_package_lock or yarn_lock may be set.		 None
update_pnpm_lock When True, the pnpm lock file will be updated automatically when any of its inputs have changed since the last update.

Defaults to True when one of npm_package_lock or yarn_lock are set. Otherwise it defaults to False.

Read more: using update_pnpm_lock		 None
preupdate Node.js scripts to run in this repository rule before auto-updating the pnpm lock file.

Scripts are run sequentially in the order they are listed. The working directory is set to the root of the external repository. Make sure all files required by preupdate scripts are added to the data attribute.

A preupdate script could, for example, transform resolutions in the root package.json file from a format that yarn understands such as @foo/**/bar to the equivalent @foo/*>bar that pnpm understands so that resolutions are compatible with pnpm when running pnpm import to update the pnpm lock file.

Only needed when update_pnpm_lock is True. Read more: using update_pnpm_lock		 []
npmrc The .npmrc file, if any, to use.

When set, the .npmrc file specified is parsed and npm auth tokens and basic authentication configuration specified in the file are passed to the Bazel downloader for authentication with private npm registries.

In a future release, pnpm settings such as public-hoist-patterns will be used.		 None
use_home_npmrc Use the $HOME/.npmrc file (or $USERPROFILE/.npmrc when on Windows) if it exists.

Settings from home .npmrc are merged with settings loaded from the .npmrc file specified in the npmrc attribute, if any. Where there are conflicting settings, the home .npmrc values will take precedence.

WARNING: The repository rule will not be invalidated by changes to the home .npmrc file since there is no way to specify this file as an input to the repository rule. If changes are made to the home .npmrc you can force the repository rule to re-run and pick up the changes by running: bazel sync --only={name} where name is the name of the npm_translate_lock you want to re-run.

Because of the repository rule invalidation issue, using the home .npmrc is not recommended. .npmrc settings should generally go in the npmrc in your repository so they are shared by all developers. The home .npmrc should be reserved for authentication settings for private npm repositories.		 None
data Data files required by this repository rule when auto-updating the pnpm lock file.

Only needed when update_pnpm_lock is True. Read more: using update_pnpm_lock		 []
patches A map of package names or package names with their version (e.g., "my-package" or "my-package@v1.2.3") to a label list of patches to apply to the downloaded npm package. Multiple matches are additive.

Read more: patching		 {}
patch_args A map of package names or package names with their version (e.g., "my-package" or "my-package@v1.2.3") to a label list arguments to pass to the patch tool. The most specific match wins.

Read more: patching		 {"*": ["-p0"]}
custom_postinstalls A map of package names or package names with their version (e.g., "my-package" or "my-package@v1.2.3") to a custom postinstall script to apply to the downloaded npm package after its lifecycle scripts runs. If the version is left out of the package name, the script will run on every version of the npm package. If a custom postinstall scripts exists for a package as well as for a specific version, the script for the versioned package will be appended with && to the non-versioned package script.

For example,

 custom_postinstalls = {     "@foo/bar": "echo something > somewhere.txt",     "fum@0.0.1": "echo something_else > somewhere_else.txt", },


Custom postinstalls are additive and joined with && when there are multiple matches for a package. More specific matches are appended to previous matches.		 {}
prod If True, only install dependencies but not devDependencies. False
public_hoist_packages A map of package names or package names with their version (e.g., "my-package" or "my-package@v1.2.3") to a list of Bazel packages in which to hoist the package to the top-level of the node_modules tree when linking.

This is similar to setting https://pnpm.io/npmrc#public-hoist-pattern in an .npmrc file outside of Bazel, however, wild-cards are not yet supported and npm_translate_lock will fail if there are multiple versions of a package that are to be hoisted.

 public_hoist_packages = {     "@foo/bar": [""] # link to the root package in the WORKSPACE     "fum@0.0.1": ["some/sub/package"] },


List of public hoist packages are additive when there are multiple matches for a package. More specific matches are appended to previous matches.		 {}
dev If True, only install devDependencies False
no_optional If True, optionalDependencies are not installed.

Currently npm_translate_lock behaves differently from pnpm in that is downloads all optionaDependencies while pnpm doesn't download optionalDependencies that are not needed for the platform pnpm is run on. See pnpm/pnpm#3672 for more context.		 False
run_lifecycle_hooks Sets a default value for lifecycle_hooks if * not already set. Set this to False to disable lifecycle hooks. True
lifecycle_hooks A dict of package names to list of lifecycle hooks to run for that package.

By default the preinstall, install and postinstall hooks are run if they exist. This attribute allows the default to be overridden for packages to run prepare.

List of hooks are not additive. The most specific match wins.

Read more: lifecycles		 {}
lifecycle_hooks_envs Environment variables set for the lifecycle hooks actions on npm packages. The environment variables can be defined per package by package name or globally using "*". Variables are declared as key/value pairs of the form "key=value". Multiple matches are additive.

Read more: lifecycles		 {}
lifecycle_hooks_exclude A list of package names or package names with their version (e.g., "my-package" or "my-package@v1.2.3") to not run any lifecycle hooks on.

Equivalent to adding <value>: [] to lifecycle_hooks.

Read more: lifecycles		 []
lifecycle_hooks_execution_requirements Execution requirements applied to the preinstall, install and postinstall lifecycle hooks on npm packages.

The execution requirements can be defined per package by package name or globally using "*".

Execution requirements are not additive. The most specific match wins.

Read more: lifecycles		 {}
lifecycle_hooks_no_sandbox If True, a "no-sandbox" execution requirement is added to all lifecycle hooks unless overridden by lifecycle_hooks_execution_requirements.

Equivalent to adding "*": ["no-sandbox"] to lifecycle_hooks_execution_requirements.

This defaults to True to limit the overhead of sandbox creation and copying the output TreeArtifacts out of the sandbox.

Read more: lifecycles		 True
bins Binary files to create in node_modules/.bin for packages in this lock file.

For a given package, this is typically derived from the "bin" attribute in the package.json file of that package.

For example:

 bins = {     "@foo/bar": {         "foo": "./foo.js",         "bar": "./bar.js"     }, }


Dicts of bins not additive. The most specific match wins.

In the future, this field may be automatically populated from information in the pnpm lock file. That feature is currently blocked on pnpm/pnpm#5131.		 {}
verify_node_modules_ignored node_modules folders in the source tree should be ignored by Bazel.

This points to a .bazelignore file to verify that all nested node_modules directories pnpm will create are listed.

See bazelbuild/bazel#8106		 None
quiet Set to False to print info logs and output stdout & stderr of pnpm lock update actions to the console. True
link_workspace The workspace name where links will be created for the packages in this lock file.

This is typically set in rule sets and libraries that vendor the starlark generated by npm_translate_lock so the link_workspace passed to npm_import is set correctly so that links are created in the external repository and not the user workspace.

Can be left unspecified if the link workspace is the user workspace.		 None
pnpm_version pnpm version to use when generating the @pnpm repository. Set to None to not create this repository. "7.17.1"
package_json Deprecated.

Add all package.json files that are part of the workspace to data instead.		 None
warn_on_unqualified_tarball_url Deprecated. Will be removed in next major release. None
kwargs Internal use only none

pnpm_repository

pnpm_repository(name, pnpm_version)

Import https://npmjs.com/package/pnpm and provide a js_binary to run the tool.

Useful as a way to run exactly the same pnpm as Bazel does, for example with: bazel run -- @pnpm//:pnpm --dir $PWD

PARAMETERS

Name Description Default Value
name name of the resulting external repository none
pnpm_version version of pnpm, see https://www.npmjs.com/package/pnpm?activeTab=versions "7.17.1"