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const { resolve } = require('path')
const semver = require('semver')
const libnpmdiff = require('libnpmdiff')
const npa = require('npm-package-arg')
const Arborist = require('@npmcli/arborist')
const npmlog = require('npmlog')
const pacote = require('pacote')
const pickManifest = require('npm-pick-manifest')
const readPackageName = require('./utils/read-package-name.js')
const BaseCommand = require('./base-command.js')
class Diff extends BaseCommand {
static get description () {
return 'The registry diff command'
}
/* istanbul ignore next - see test/lib/load-all-commands.js */
static get name () {
return 'diff'
}
/* istanbul ignore next - see test/lib/load-all-commands.js */
static get usage () {
return [
'[...<paths>]',
]
}
/* istanbul ignore next - see test/lib/load-all-commands.js */
static get params () {
return [
'diff',
'diff-name-only',
'diff-unified',
'diff-ignore-all-space',
'diff-no-prefix',
'diff-src-prefix',
'diff-dst-prefix',
'diff-text',
'global',
'tag',
'workspace',
'workspaces',
]
}
exec (args, cb) {
this.diff(args).then(() => cb()).catch(cb)
}
execWorkspaces (args, filters, cb) {
this.diffWorkspaces(args, filters).then(() => cb()).catch(cb)
}
async diff (args) {
const specs = this.npm.config.get('diff').filter(d => d)
if (specs.length > 2) {
throw new TypeError(
'Can\'t use more than two --diff arguments.\n\n' +
`Usage:\n${this.usage}`
)
}
// diffWorkspaces may have set this already
if (!this.prefix)
this.prefix = this.npm.prefix
// this is the "top" directory, one up from node_modules
// in global mode we have to walk one up from globalDir because our
// node_modules is sometimes under ./lib, and in global mode we're only ever
// walking through node_modules (because we will have been given a package
// name already)
if (this.npm.config.get('global'))
this.top = resolve(this.npm.globalDir, '..')
else
this.top = this.prefix
const [a, b] = await this.retrieveSpecs(specs)
npmlog.info('diff', { src: a, dst: b })
const res = await libnpmdiff([a, b], {
...this.npm.flatOptions,
diffFiles: args,
where: this.top,
})
return this.npm.output(res)
}
async diffWorkspaces (args, filters) {
await this.setWorkspaces(filters)
for (const workspacePath of this.workspacePaths) {
this.top = workspacePath
this.prefix = workspacePath
await this.diff(args)
}
}
// get the package name from the packument at `path`
// throws if no packument is present OR if it does not have `name` attribute
async packageName (path) {
let name
try {
name = await readPackageName(this.prefix)
} catch (e) {
npmlog.verbose('diff', 'could not read project dir package.json')
}
if (!name)
throw this.usageError('Needs multiple arguments to compare or run from a project dir.\n')
return name
}
async retrieveSpecs ([a, b]) {
if (a && b) {
const specs = await this.convertVersionsToSpecs([a, b])
return this.findVersionsByPackageName(specs)
}
// no arguments, defaults to comparing cwd
// to its latest published registry version
if (!a) {
const pkgName = await this.packageName(this.prefix)
return [
`${pkgName}@${this.npm.config.get('tag')}`,
`file:${this.prefix}`,
]
}
// single argument, used to compare wanted versions of an
// installed dependency or to compare the cwd to a published version
let noPackageJson
let pkgName
try {
pkgName = await readPackageName(this.prefix)
} catch (e) {
npmlog.verbose('diff', 'could not read project dir package.json')
noPackageJson = true
}
const missingPackageJson = this.usageError('Needs multiple arguments to compare or run from a project dir.\n')
// using a valid semver range, that means it should just diff
// the cwd against a published version to the registry using the
// same project name and the provided semver range
if (semver.validRange(a)) {
if (!pkgName)
throw missingPackageJson
return [
`${pkgName}@${a}`,
`file:${this.prefix}`,
]
}
// when using a single package name as arg and it's part of the current
// install tree, then retrieve the current installed version and compare
// it against the same value `npm outdated` would suggest you to update to
const spec = npa(a)
if (spec.registry) {
let actualTree
let node
try {
const opts = {
...this.npm.flatOptions,
path: this.top,
}
const arb = new Arborist(opts)
actualTree = await arb.loadActual(opts)
node = actualTree &&
actualTree.inventory.query('name', spec.name)
.values().next().value
} catch (e) {
npmlog.verbose('diff', 'failed to load actual install tree')
}
if (!node || !node.name || !node.package || !node.package.version) {
if (noPackageJson)
throw missingPackageJson
return [
`${spec.name}@${spec.fetchSpec}`,
`file:${this.prefix}`,
]
}
const tryRootNodeSpec = () =>
(actualTree && actualTree.edgesOut.get(spec.name) || {}).spec
const tryAnySpec = () => {
for (const edge of node.edgesIn)
return edge.spec
}
const aSpec = `file:${node.realpath}`
// finds what version of the package to compare against, if a exact
// version or tag was passed than it should use that, otherwise
// work from the top of the arborist tree to find the original semver
// range declared in the package that depends on the package.
let bSpec
if (spec.rawSpec)
bSpec = spec.rawSpec
else {
const bTargetVersion =
tryRootNodeSpec()
|| tryAnySpec()
// figure out what to compare against,
// follows same logic to npm outdated "Wanted" results
const packument = await pacote.packument(spec, {
...this.npm.flatOptions,
preferOnline: true,
})
bSpec = pickManifest(
packument,
bTargetVersion,
{ ...this.npm.flatOptions }
).version
}
return [
`${spec.name}@${aSpec}`,
`${spec.name}@${bSpec}`,
]
} else if (spec.type === 'directory') {
return [
`file:${spec.fetchSpec}`,
`file:${this.prefix}`,
]
} else
throw this.usageError(`Spec type ${spec.type} not supported.\n`)
}
async convertVersionsToSpecs ([a, b]) {
const semverA = semver.validRange(a)
const semverB = semver.validRange(b)
// both specs are semver versions, assume current project dir name
if (semverA && semverB) {
let pkgName
try {
pkgName = await readPackageName(this.prefix)
} catch (e) {
npmlog.verbose('diff', 'could not read project dir package.json')
}
if (!pkgName)
throw this.usageError('Needs to be run from a project dir in order to diff two versions.\n')
return [`${pkgName}@${a}`, `${pkgName}@${b}`]
}
// otherwise uses the name from the other arg to
// figure out the spec.name of what to compare
if (!semverA && semverB)
return [a, `${npa(a).name}@${b}`]
if (semverA && !semverB)
return [`${npa(b).name}@${a}`, b]
// no valid semver ranges used
return [a, b]
}
async findVersionsByPackageName (specs) {
let actualTree
try {
const opts = {
...this.npm.flatOptions,
path: this.top,
}
const arb = new Arborist(opts)
actualTree = await arb.loadActual(opts)
} catch (e) {
npmlog.verbose('diff', 'failed to load actual install tree')
}
return specs.map(i => {
const spec = npa(i)
if (spec.rawSpec)
return i
const node = actualTree
&& actualTree.inventory.query('name', spec.name)
.values().next().value
const res = !node || !node.package || !node.package.version
? spec.fetchSpec
: `file:${node.realpath}`
return `${spec.name}@${res}`
})
}
}
module.exports = Diff