fix: totally rework package installation to peer deps

bin/npm-template-check.js

@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+
+const check = require('../lib/check.js')
+
+const main = async () => {
+  const {
+    npm_config_local_prefix: root,
+  } = process.env
+
+  if (!root) {
+    throw new Error('This package requires npm >7.21.1')
+  }
+
+  const problems = await check(root)
+  if (problems.length) {
+    console.error('Some problems were detected:')
+    console.error()
+    console.error(problems.map((problem) => problem.message).join('\n'))
+    console.error()
+    console.error('To correct them:')
+    console.error(problems.map((problem) => problem.solution).join('\n'))
+    process.exitCode = 1
+  }
+}
+
+module.exports = main().catch((err) => {
+  console.error(err.stack)
+  process.exitCode = 1
+})

bin/postinstall.js

@@ -1,7 +1,6 @@
 #!/usr/bin/env node
 
 const copyContent = require('../lib/content/index.js')
-const installPackages = require('../lib/install.js')
 const patchPackage = require('../lib/package.js')
 
 const main = async () => {
@@ -20,8 +19,7 @@ const main = async () => {
     return
   }
 
-  await copyContent(root)
-  return installPackages(root)
+  return copyContent(root)
 }
 
 // we export the promise so it can be awaited in tests, coverage is disabled

lib/check.js

@@ -0,0 +1,95 @@
+const { join } = require('path')
+const fs = require('@npmcli/fs')
+
+const patchPackage = require('./package.js')
+
+const unwantedPackages = [
+  '@npmcli/lint',
+  'eslint-plugin-promise',
+  'eslint-plugin-standard',
+  'eslint-plugin-import',
+]
+
+const hasOwn = (obj, key) => Object.prototype.hasOwnProperty.call(obj, key)
+
+const check = async (root) => {
+  const pkgPath = join(root, 'package.json')
+  try {
+    var contents = await fs.readFile(pkgPath, { encoding: 'utf8' })
+  } catch (err) {
+    throw new Error('No package.json found')
+  }
+
+  const pkg = JSON.parse(contents)
+
+  const problems = []
+
+  const incorrectFields = []
+  // 1. ensure package.json changes have been applied
+  for (const [key, value] of Object.entries(patchPackage.changes)) {
+    if (!hasOwn(pkg, key)) {
+      incorrectFields.push({
+        name: key,
+        found: pkg[key],
+        expected: value,
+      })
+      continue
+    }
+
+    if (value && typeof value === 'object') {
+      for (const [subKey, subValue] of Object.entries(value)) {
+        if (!hasOwn(pkg[key], subKey) ||
+          pkg[key][subKey] !== subValue) {
+          incorrectFields.push({
+            name: `${key}.${subKey}`,
+            found: pkg[key][subKey],
+            expected: subValue,
+          })
+        }
+      }
+    } else {
+      if (pkg[key] !== patchPackage.changes[key]) {
+        incorrectFields.push({
+          name: key,
+          found: pkg[key],
+          expected: value,
+        })
+      }
+    }
+  }
+
+  if (incorrectFields.length) {
+    problems.push({
+      message: [
+        `The following package.json fields are incorrect:`,
+        ...incorrectFields.map((field) => {
+          const { name, found, expected } = field
+          return `  Field: "${name}" Expected: "${expected}" Found: "${found}"`
+        }),
+      ].join('\n'),
+      solution: 'npm rm @npmcli/template-oss && npm i -D @npmcli/template-oss',
+    })
+  }
+
+  // 2. ensure packages that should not be present are removed
+  const mustRemove = unwantedPackages.filter((name) => {
+    return hasOwn(pkg.dependencies || {}, name) ||
+      hasOwn(pkg.devDependencies || {}, name)
+  })
+
+  if (mustRemove.length) {
+    problems.push({
+      message: [
+        'The following unwanted packages were found:',
+        ...mustRemove,
+      ].join(' '),
+      solution: `npm rm ${mustRemove.join(' ')}`,
+    })
+  }
+
+  return problems
+}
+
+check.unwantedPackages = unwantedPackages
+
+module.exports = check

lib/package.js

@@ -9,6 +9,7 @@ const changes = {
   templateVersion: TEMPLATE_VERSION,
   scripts: {
     lint: `eslint '**/*.js'`,
+    postlint: 'npm-template-check',
     lintfix: 'npm run lint -- --fix',
     preversion: 'npm test',
     postversion: 'npm publish',

package.json

@@ -3,8 +3,13 @@
   "version": "1.0.2",
   "description": "templated files used in npm CLI team oss projects",
   "main": "lib/index.js",
+  "bin": {
+    "npm-template-check": "bin/npm-template-check.js"
+  },
   "scripts": {
+    "prelint": "ln -sf ../../bin/npm-template-check.js node_modules/.bin/npm-template-check",
     "lint": "eslint '**/*.js'",
+    "postlint": "npm-template-check",
     "lintfix": "npm run lint -- --fix",
     "preversion": "npm test",
     "postversion": "npm publish",
@@ -34,11 +39,14 @@
     "lib"
   ],
   "devDependencies": {
-    "@npmcli/eslint-config": "^1.0.0",
+    "@npmcli/eslint-config": "*",
     "eslint": "^7.32.0",
     "eslint-plugin-node": "^11.1.0",
-    "spawk": "^1.7.1",
+    "tap": "*"
+  },
+  "peerDependencies": {
+    "@npmcli/eslint-config": "^1.0.0",
     "tap": "^15.0.9"
   },
-  "templateVersion": "1.0.1"
+  "templateVersion": "1.0.2"
 }

test/postinstall.js

@@ -1,16 +1,12 @@
 const { basename, dirname, join, normalize } = require('path')
 const fs = require('@npmcli/fs')
-const spawk = require('spawk')
 const t = require('tap')
 
 const TEMPLATE_VERSION = require('../package.json').version
 
 const copyContents = require('../lib/content/index.js')
-const installPackages = require('../lib/install.js')
 const patchPackage = require('../lib/package.js')
 
-spawk.preventUnmatched()
-
 t.test('when npm_config_global is true, does nothing', async (t) => {
   // this is set by virtue of running tests with npm, save it and remove it
   const _env = process.env.npm_config_global
@@ -94,24 +90,9 @@ t.test('sets up a new project', async (t) => {
     process.env.npm_config_local_prefix = _prefix
   })
 
-  const uninstall = spawk.spawn('npm', (args) => {
-    return args[0] === 'uninstall' &&
-      installPackages.removeDeps.every((dep) => args.includes(dep))
-  }, { cwd: root })
-
-  const install = spawk.spawn('npm', (args) => {
-    return args[0] === 'install' &&
-      args[1] === '--save-dev' &&
-      installPackages.devDeps.every((dep) => args.includes(dep))
-  }, { cwd: root })
-
   // t.mock instead of require so the cache doesn't interfere
   await t.mock('../bin/postinstall.js')
 
-  // we mock the npm commands so this test doesn't take forever
-  t.ok(uninstall.called, 'ran uninstalls')
-  t.ok(install.called, 'ran installs')
-
   // verify file contents were copied
   const contents = await fs.readdir(root)
   for (const file in copyContents.content) {