feat(inspect): add --rule and --plugin options for inspect command

packages/@vue/cli-service/lib/commands/inspect.js

@@ -83,6 +83,8 @@ module.exports = (api, options) => {
     usage: 'vue-cli-service inspect [options] [...paths]',
     options: {
       '--mode': 'specify env mode (default: development)',
+      '--rule': 'inspect a specific module rule',
+      '--plugin': 'inspect a specific plugin',
       '--verbose': 'show full function definitions in output'
     }
   }, args => {
@@ -94,7 +96,11 @@ module.exports = (api, options) => {
     const paths = args._
 
     let res
-    if (paths.length > 1) {
+    if (args.rule) {
+      res = config.module.rules.find(r => r.__ruleName === args.rule)
+    } else if (args.plugin) {
+      res = config.plugins.find(p => p.__pluginName === args.plugin)
+    } else if (paths.length > 1) {
       res = {}
       paths.forEach(path => {
         res[path] = get(config, path)
@@ -106,7 +112,7 @@ module.exports = (api, options) => {
     }
 
     const pluginRE = /(?:function|class) (\w+Plugin)/
-    console.log(stringify(res, (value, indent, stringify) => {
+    const output = stringify(res, (value, indent, stringify) => {
       // shorten long functions
       if (
         !args.verbose &&
@@ -151,7 +157,9 @@ module.exports = (api, options) => {
       }
 
       return stringify(value)
-    }, 2))
+    }, 2)
+
+    console.log(output)
   })
 }
 

packages/@vue/cli/bin/vue.js

@@ -68,6 +68,8 @@ program
 program
   .command('inspect [paths...]')
   .option('--mode <mode>')
+  .option('--rule <ruleName>', 'inspect a specific module rule')
+  .option('--plugin <pluginName>', 'inspect a specific plugin')
   .option('-v --verbose', 'Show full function definitions in output')
   .description('inspect the webpack config in a project with vue-cli-service')
   .action((paths, cmd) => {

packages/@vue/cli/lib/inspect.js

@@ -19,6 +19,8 @@ module.exports = function inspect (paths, args) {
       binPath,
       'inspect',
       ...(args.mode ? ['--mode', args.mode] : []),
+      ...(args.rule ? ['--rule', args.rule] : []),
+      ...(args.plugin ? ['--plugin', args.plugin] : []),
       ...(args.verbose ? ['--verbose'] : []),
       ...paths
     ], { cwd, stdio: 'inherit' })