feat(explain): add workspaces support

- Add highlight style for workspaces items in human output
- Add ability to filter results by workspace using `-w` config
- Added tests and docs

Fixes: npm/statusboard#300

docs/content/commands/npm-explain.md

@@ -65,6 +65,28 @@ Whether or not to output JSON data, rather than the normal output.
 
 Not supported by all npm commands.
 
+#### `workspace`
+
+* Default:
+* Type: String (can be set multiple times)
+
+Enable running a command in the context of the configured workspaces of the
+current project while filtering by running only the workspaces defined by
+this configuration option.
+
+Valid values for the `workspace` config are either:
+
+* Workspace names
+* Path to a workspace directory
+* Path to a parent workspace directory (will result to selecting all of the
+  nested workspaces)
+
+When set for the `npm init` command, this may be set to the folder of a
+workspace which does not yet exist, to create the folder and set it up as a
+brand new workspace within the project.
+
+This value is not exported to the environment for child processes.
+
 <!-- AUTOGENERATED CONFIG DESCRIPTIONS END -->
 
 ### See Also

lib/explain.js

@@ -5,9 +5,9 @@ const npa = require('npm-package-arg')
 const semver = require('semver')
 const { relative, resolve } = require('path')
 const validName = require('validate-npm-package-name')
-const BaseCommand = require('./base-command.js')
+const ArboristWorkspaceCmd = require('./workspaces/arborist-cmd.js')
 
-class Explain extends BaseCommand {
+class Explain extends ArboristWorkspaceCmd {
   static get description () {
     return 'Explain installed packages'
   }
@@ -24,7 +24,10 @@ class Explain extends BaseCommand {
 
   /* istanbul ignore next - see test/lib/load-all-commands.js */
   static get params () {
-    return ['json']
+    return [
+      'json',
+      'workspace',
+    ]
   }
 
   /* istanbul ignore next - see test/lib/load-all-commands.js */
@@ -43,10 +46,18 @@ class Explain extends BaseCommand {
     const arb = new Arborist({ path: this.npm.prefix, ...this.npm.flatOptions })
     const tree = await arb.loadActual()
 
+    if (this.workspaces && this.workspaces.length)
+      this.filterSet = arb.workspaceDependencySet(tree, this.workspaces)
+
     const nodes = new Set()
     for (const arg of args) {
-      for (const node of this.getNodes(tree, arg))
-        nodes.add(node)
+      for (const node of this.getNodes(tree, arg)) {
+        const filteredOut = this.filterSet
+          && this.filterSet.size > 0
+          && !this.filterSet.has(node)
+        if (!filteredOut)
+          nodes.add(node)
+      }
     }
     if (nodes.size === 0)
       throw `No dependencies found matching ${args.join(', ')}`
@@ -80,7 +91,7 @@ class Explain extends BaseCommand {
     // if it's just a name, return packages by that name
     const { validForOldPackages: valid } = validName(arg)
     if (valid)
-      return tree.inventory.query('name', arg)
+      return tree.inventory.query('packageName', arg)
 
     // if it's a location, get that node
     const maybeLoc = arg.replace(/\\/g, '/').replace(/\/+$/, '')

lib/utils/explain-dep.js

@@ -7,19 +7,24 @@ const nocolor = {
   cyan: s => s,
   magenta: s => s,
   blue: s => s,
+  green: s => s,
 }
 
+const { relative } = require('path')
+
 const explainNode = (node, depth, color) =>
   printNode(node, color) +
-  explainDependents(node, depth, color)
+  explainDependents(node, depth, color) +
+  explainLinksIn(node, depth, color)
 
 const colorType = (type, color) => {
-  const { red, yellow, cyan, magenta, blue } = color ? chalk : nocolor
+  const { red, yellow, cyan, magenta, blue, green } = color ? chalk : nocolor
   const style = type === 'extraneous' ? red
     : type === 'dev' ? yellow
     : type === 'optional' ? cyan
     : type === 'peer' ? magenta
     : type === 'bundled' ? blue
+    : type === 'workspace' ? green
     : /* istanbul ignore next */ s => s
   return style(type)
 }
@@ -34,8 +39,9 @@ const printNode = (node, color) => {
     optional,
     peer,
     bundled,
+    isWorkspace,
   } = node
-  const { bold, dim } = color ? chalk : nocolor
+  const { bold, dim, green } = color ? chalk : nocolor
   const extra = []
   if (extraneous)
     extra.push(' ' + bold(colorType('extraneous', color)))
@@ -52,10 +58,23 @@ const printNode = (node, color) => {
   if (bundled)
     extra.push(' ' + bold(colorType('bundled', color)))
 
-  return `${bold(name)}@${bold(version)}${extra.join('')}` +
+  const pkgid = isWorkspace
+    ? green(`${name}@${version}`)
+    : `${bold(name)}@${bold(version)}`
+
+  return `${pkgid}${extra.join('')}` +
     (location ? dim(`\n${location}`) : '')
 }
 
+const explainLinksIn = ({ linksIn }, depth, color) => {
+  if (!linksIn || !linksIn.length || depth <= 0)
+    return ''
+
+  const messages = linksIn.map(link => explainNode(link, depth - 1, color))
+  const str = '\n' + messages.join('\n')
+  return str.split('\n').join('\n  ')
+}
+
 const explainDependents = ({ name, dependents }, depth, color) => {
   if (!dependents || !dependents.length || depth <= 0)
     return ''
@@ -88,18 +107,23 @@ const explainDependents = ({ name, dependents }, depth, color) => {
 
 const explainEdge = ({ name, type, bundled, from, spec }, depth, color) => {
   const { bold } = color ? chalk : nocolor
+  const dep = type === 'workspace'
+    ? bold(relative('.', spec.slice('file:'.length)))
+    : `${bold(name)}@"${bold(spec)}"`
+  const fromMsg = ` from ${explainFrom(from, depth, color)}`
+
   return (type === 'prod' ? '' : `${colorType(type, color)} `) +
     (bundled ? `${colorType('bundled', color)} ` : '') +
-    `${bold(name)}@"${bold(spec)}" from ` +
-    explainFrom(from, depth, color)
+    `${dep}${fromMsg}`
 }
 
 const explainFrom = (from, depth, color) => {
   if (!from.name && !from.version)
     return 'the root project'
 
   return printNode(from, color) +
-    explainDependents(from, depth - 1, color)
+    explainDependents(from, depth - 1, color) +
+    explainLinksIn(from, depth - 1, color)
 }
 
 module.exports = { explainNode, printNode, explainEdge }

tap-snapshots/test/lib/utils/explain-dep.js.test.cjs

@@ -199,3 +199,29 @@ exports[`test/lib/utils/explain-dep.js TAP prodDep > print nocolor 1`] = `
 [email protected]
 node_modules/prod-dep
 `
+
+exports[`test/lib/utils/explain-dep.js TAP workspaces > explain color deep 1`] = `
+[[email protected]
+a
+  [[email protected]
+  node_modules/a
+    workspace test/lib/utils/tap-testdir-explain-dep/ws-project/a from the root project
+`
+
+exports[`test/lib/utils/explain-dep.js TAP workspaces > explain nocolor shallow 1`] = `
+[email protected]
+a
+  [email protected]
+  node_modules/a
+    workspace test/lib/utils/tap-testdir-explain-dep/ws-project/a from the root project
+`
+
+exports[`test/lib/utils/explain-dep.js TAP workspaces > print color 1`] = `
+[[email protected]
+a
+`
+
+exports[`test/lib/utils/explain-dep.js TAP workspaces > print nocolor 1`] = `
+[email protected]
+a
+`

tap-snapshots/test/lib/utils/npm-usage.js.test.cjs

@@ -430,7 +430,7 @@ All commands:
                     npm explain <folder | specifier>
                     
                     Options:
-                    [--json]
+                    [--json] [-w|--workspace <workspace-name> [-w|--workspace <workspace-name> ...]]
                     
                     alias: why
                     

test/lib/explain.js

@@ -175,3 +175,129 @@ t.test('explain some nodes', t => {
   })
   t.end()
 })
+
+t.test('workspaces', async t => {
+  npm.localPrefix = npm.prefix = t.testdir({
+    'package.json': JSON.stringify({
+      name: 'workspaces-project',
+      version: '1.0.0',
+      workspaces: ['packages/*'],
+      dependencies: {
+        abbrev: '^1.0.0',
+      },
+    }),
+    node_modules: {
+      a: t.fixture('symlink', '../packages/a'),
+      b: t.fixture('symlink', '../packages/b'),
+      c: t.fixture('symlink', '../packages/c'),
+      once: {
+        'package.json': JSON.stringify({
+          name: 'once',
+          version: '1.0.0',
+          dependencies: {
+            wrappy: '2.0.0',
+          },
+        }),
+      },
+      abbrev: {
+        'package.json': JSON.stringify({
+          name: 'abbrev',
+          version: '1.0.0',
+        }),
+      },
+      wrappy: {
+        'package.json': JSON.stringify({
+          name: 'wrappy',
+          version: '2.0.0',
+        }),
+      },
+    },
+    packages: {
+      a: {
+        'package.json': JSON.stringify({
+          name: 'a',
+          version: '1.0.0',
+          dependencies: {
+            once: '1.0.0',
+          },
+        }),
+      },
+      b: {
+        'package.json': JSON.stringify({
+          name: 'b',
+          version: '1.0.0',
+          dependencies: {
+            abbrev: '^1.0.0',
+          },
+        }),
+      },
+      c: {
+        'package.json': JSON.stringify({
+          name: 'c',
+          version: '1.0.0',
+        }),
+      },
+    },
+  })
+
+  await new Promise((res, rej) => {
+    explain.exec(['wrappy'], err => {
+      if (err)
+        rej(err)
+
+      t.strictSame(
+        OUTPUT,
+        [['[email protected] depth=Infinity color=true']],
+        'should explain workspaces deps'
+      )
+      OUTPUT.length = 0
+      res()
+    })
+  })
+
+  await new Promise((res, rej) => {
+    explain.execWorkspaces(['wrappy'], ['a'], err => {
+      if (err)
+        rej(err)
+
+      t.strictSame(
+        OUTPUT,
+        [
+          ['[email protected] depth=Infinity color=true'],
+        ],
+        'should explain deps when filtering to a single ws'
+      )
+      OUTPUT.length = 0
+      res()
+    })
+  })
+
+  await new Promise((res, rej) => {
+    explain.execWorkspaces(['abbrev'], [], err => {
+      if (err)
+        rej(err)
+
+      t.strictSame(
+        OUTPUT,
+        [
+          ['[email protected] depth=Infinity color=true'],
+        ],
+        'should explain deps of workspaces only'
+      )
+      OUTPUT.length = 0
+      res()
+    })
+  })
+
+  await new Promise((res, rej) => {
+    explain.execWorkspaces(['abbrev'], ['a'], err => {
+      t.equal(
+        err,
+        'No dependencies found matching abbrev',
+        'should throw usage if dep not found within filtered ws'
+      )
+
+      res()
+    })
+  })
+})

test/lib/utils/explain-dep.js

@@ -1,8 +1,7 @@
+const { resolve } = require('path')
 const t = require('tap')
-const npm = {}
-const { explainNode, printNode } = t.mock('../../../lib/utils/explain-dep.js', {
-  '../../../lib/npm.js': npm,
-})
+const { explainNode, printNode } = require('../../../lib/utils/explain-dep.js')
+const testdir = t.testdir({})
 
 const cases = {
   prodDep: {
@@ -204,9 +203,32 @@ cases.manyDeps = {
   ],
 }
 
+cases.workspaces = {
+  name: 'a',
+  version: '1.0.0',
+  location: 'a',
+  isWorkspace: true,
+  dependents: [],
+  linksIn: [
+    {
+      name: 'a',
+      version: '1.0.0',
+      location: 'node_modules/a',
+      isWorkspace: true,
+      dependents: [
+        {
+          type: 'workspace',
+          name: 'a',
+          spec: `file:${resolve(testdir, 'ws-project', 'a')}`,
+          from: { location: resolve(testdir, 'ws-project') },
+        },
+      ],
+    },
+  ],
+}
+
 for (const [name, expl] of Object.entries(cases)) {
   t.test(name, t => {
-    npm.color = true
     t.matchSnapshot(printNode(expl, true), 'print color')
     t.matchSnapshot(printNode(expl, false), 'print nocolor')
     t.matchSnapshot(explainNode(expl, Infinity, true), 'explain color deep')