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Usage:

ncu --doctor
ncu --no-doctor
ncu -d

Iteratively installs upgrades and runs tests to identify breaking upgrades. Reverts broken upgrades and updates package.json with working upgrades.

Add -u to execute (modifies your package file, lock file, and node_modules)

To be more precise:

1. Runs npm install and npm test to ensure tests are currently passing.
2. Runs ncu -u to optimistically upgrade all dependencies.
3. If tests pass, hurray!
4. If tests fail, restores package file and lock file.
5. For each dependency, install upgrade and run tests.
6. Prints broken upgrades with test error.
7. Saves working upgrades to package.json.

Additional options:

Example:

$ ncu --doctor -u
Running tests before upgrading
npm install
npm run test
Upgrading all dependencies and re-running tests
ncu -u
npm install
npm run test
Tests failed
Identifying broken dependencies
npm install
npm install --no-save react@16.0.0
npm run test
  ✓ react 15.0.0 → 16.0.0
npm install --no-save react-redux@7.0.0
npm run test
  ✗ react-redux 6.0.0 → 7.0.0

/projects/myproject/test.js:13
  throw new Error('Test failed!')
  ^

npm install --no-save react-dnd@11.1.3
npm run test
  ✓ react-dnd 10.0.0 → 11.1.3
Saving partially upgraded package.json

Filters out upgrades based on a user provided function.

filterResults runs after new versions are fetched, in contrast to filter and filterVersion, which run before. This allows you to filter out upgrades with filterResults based on how the version has changed (e.g. a major version change).

Only available in .ncurc.js or when importing npm-check-updates as a module.

/** Filter out non-major version updates.
  @param {string} packageName        The name of the dependency.
  @param {string} current            Current version declaration (may be a range).
  @param {SemVer[]} currentSemver    Current version declaration in semantic versioning format (may be a range).
  @param {string} upgraded           Upgraded version.
  @param {SemVer} upgradedSemver     Upgraded version in semantic versioning format.
  @returns {boolean}                 Return true if the upgrade should be kept, otherwise it will be ignored.
*/
filterResults: (packageName, { current, currentSemver, upgraded, upgradedSemver }) => {
  const currentMajor = parseInt(currentSemver?.[0]?.major, 10)
  const upgradedMajor = parseInt(upgradedSemver?.major, 10)
  if (currentMajor && upgradedMajor) {
    return currentMajor < upgradedMajor
  }
  return true
}

For the SemVer type definition, see: https://git.coolaj86.com/coolaj86/semver-utils.js#semverutils-parse-semverstring

Usage:

ncu --format [value]

Modify the output formatting or show additional information. Specify one or more comma-delimited values.

Customize how packages are divided into groups when using --format group.

Only available in .ncurc.js or when importing npm-check-updates as a module.

/**
  @param name             The name of the dependency.
  @param defaultGroup     The predefined group name which will be used by default.
  @param currentSpec      The current version range in your package.json.
  @param upgradedSpec     The upgraded version range that will be written to your package.json.
  @param upgradedVersion  The upgraded version number returned by the registry.
  @returns                A predefined group name ('major' | 'minor' | 'patch' | 'majorVersionZero' | 'none') or a custom string to create your own group.
*/
groupFunction: (name, defaultGroup, currentSpec, upgradedSpec, upgradedVersion) => {
  if (name === 'typescript' && defaultGroup === 'minor') {
    return 'major'
  }
  if (name.startsWith('@myorg/')) {
    return 'My Org'
  }
  return defaultGroup
}

Usage:

ncu --packageManager [s]
ncu -p [s]

Specifies the package manager to use when looking up version numbers.

$ ncu --packageManager staticRegistry --registry ./my-registry.json

{
  "prettier": "2.7.1",
  "typescript": "4.7.4"
}

Usage:

ncu --peer
ncu --no-peer

Check peer dependencies of installed packages and filter updates to compatible versions.

Example:

The following example demonstrates how --peer works, and how it uses peer dependencies from upgraded modules.

The package ncu-test-peer-update has two versions published:

• 1.0.0 has peer dependency "ncu-test-return-version": "1.0.x"
• 1.1.0 has peer dependency "ncu-test-return-version": "1.1.x"

Our test app has the following dependencies:

"ncu-test-peer-update": "1.0.0",
"ncu-test-return-version": "1.0.0"

The latest versions of these packages are:

"ncu-test-peer-update": "1.1.0",
"ncu-test-return-version": "2.0.0"

With --peer:

ncu upgrades packages to the highest version that still adheres to the peer dependency constraints:

ncu-test-peer-update     1.0.0  →  1.1.0
ncu-test-return-version  1.0.0  →  1.1.0

Without --peer:

As a comparison: without using the --peer option, ncu will suggest the latest versions, ignoring peer dependencies:

ncu-test-peer-update     1.0.0  →  1.1.0
ncu-test-return-version  1.0.0  →  2.0.0

Usage:

ncu --registry [uri]
ncu -r [uri]

Specify the registry to use when looking up package version numbers.

When --packageManager staticRegistry is set, --registry must specify a path to a JSON registry file.

Usage:

ncu --target [value]
ncu -t [value]

Determines the version to upgrade to. (default: "latest")

You can also specify a custom function in your .ncurc.js file, or when importing npm-check-updates as a module:

/** Upgrade major version zero to the next minor version, and everything else to latest.
  @param dependencyName The name of the dependency.
  @param parsedVersion A parsed Semver object from semver-utils.
    (See https://git.coolaj86.com/coolaj86/semver-utils.js#semverutils-parse-semverstring)
  @returns One of the valid target values (specified in the table above).
*/
target: (dependencyName, [{ semver, version, operator, major, minor, patch, release, build }]) => {
  if (major === '0') return 'minor'
  return 'latest'
}