Improve error message on missed browserslist

index.js

@@ -18,7 +18,7 @@ function BrowserslistUpdateError(message) {
 BrowserslistUpdateError.prototype = Error.prototype
 
 // Check if HADOOP_HOME is set to determine if this is running in a Hadoop environment
-const IsHadoopExists = !! process.env.HADOOP_HOME
+const IsHadoopExists = !!process.env.HADOOP_HOME
 const yarnCommand = IsHadoopExists ? 'yarnpkg' : 'yarn'
 
 /* c8 ignore next 3 */
@@ -63,9 +63,13 @@ function detectLockfile() {
 function getLatestInfo(lock) {
  if (lock.mode === 'yarn') {
  if (lock.version === 1) {
- return JSON.parse(execSync(yarnCommand + ' info caniuse-lite --json').toString()).data
+ return JSON.parse(
+ execSync(yarnCommand + ' info caniuse-lite --json').toString()
+ ).data
  } else {
- return JSON.parse(execSync(yarnCommand + ' npm info caniuse-lite --json').toString())
+ return JSON.parse(
+ execSync(yarnCommand + ' npm info caniuse-lite --json').toString()
+ )
  }
  }
  if (lock.mode === 'pnpm') {
@@ -210,7 +214,8 @@ function updatePackageManually(print, lock, latest) {
  )
  writeFileSync(lock.file, lockfileData.content)
 
- let install = lock.mode === 'yarn' ? yarnCommand + ' add -W' : lock.mode + ' install'
+ let install =
+ lock.mode === 'yarn' ? yarnCommand + ' add -W' : lock.mode + ' install'
  print(
  'Installing new caniuse-lite version\n' +
  pico.yellow('$ ' + install + ' caniuse-lite') +
@@ -233,7 +238,8 @@ function updatePackageManually(print, lock, latest) {
  process.exit(1)
  } /* c8 ignore end */
 
- let del = lock.mode === 'yarn' ? yarnCommand + ' remove -W' : lock.mode + ' uninstall'
+ let del =
+ lock.mode === 'yarn' ? yarnCommand + ' remove -W' : lock.mode + ' uninstall'
  print(
  'Cleaning package.json dependencies from caniuse-lite\n' +
  pico.yellow('$ ' + del + ' caniuse-lite') +
@@ -243,7 +249,7 @@ function updatePackageManually(print, lock, latest) {
 }
 
 function updateWith(print, cmd) {
- print( 'Updating caniuse-lite version\n' + pico.yellow('$ ' + cmd) + '\n' )
+ print('Updating caniuse-lite version\n' + pico.yellow('$ ' + cmd) + '\n')
  try {
  execSync(cmd)
  } catch (e) /* c8 ignore start */ {
@@ -297,15 +303,24 @@ module.exports = function updateDB(print = defaultPrint) {
  }
 
  if (listError) {
- print(
- pico.red(
- '\n' +
- listError.stack +
- '\n\n' +
- 'Problem with browser list retrieval.\n' +
- 'Target browser changes won’t be shown.\n'
+ if (listError.message.includes("Cannot find module 'browserslist'")) {
+ print(
+ pico.gray(
+ 'Install `browserslist` to your direct dependencies ' +
+ 'to see target browser changes\n'
+ )
  )
- )
+ } else {
+ print(
+ pico.red(
+ '\n' +
+ listError.stack +
+ '\n\n' +
+ 'Problem with browser list retrieval.\n' +
+ 'Target browser changes won’t be shown.\n'
+ )
+ )
+ }
  } else {
  let changes = diffBrowsers(oldList, newList)
  if (changes) {