feat: make flag deprecation warnings less noisy

src/command.ts

@@ -246,20 +246,23 @@ export default abstract class Command {
     const g: any = global
     g['http-call'] = g['http-call'] || {}
     g['http-call']!.userAgent = this.config.userAgent
-    this.checkForDeprecations()
+    this.warnIfCommandDeprecated()
   }
 
-  protected checkForDeprecations() {
+  protected warnIfFlagDeprecated(flags: Record<string, unknown>) {
+    for (const flag of Object.keys(flags)) {
+      const deprecated = this.ctor.flags[flag]?.deprecated
+      if (deprecated) {
+        this.warn(formatFlagDeprecationWarning(flag, deprecated))
+      }
+    }
+  }
+
+  protected warnIfCommandDeprecated(): void {
     if (this.ctor.state === 'deprecated') {
       const cmdName = toConfiguredId(this.ctor.id, this.config)
       this.warn(formatCommandDeprecationWarning(cmdName, this.ctor.deprecationOptions))
     }
-
-    for (const [flag, opts] of Object.entries(this.ctor.flags ?? {})) {
-      if (opts.deprecated) {
-        this.warn(formatFlagDeprecationWarning(flag, opts.deprecated))
-      }
-    }
   }
 
   protected async parse<F extends Interfaces.FlagOutput, G extends Interfaces.FlagOutput, A extends { [name: string]: any }>(options?: Interfaces.Input<F, G>, argv = this.argv): Promise<Interfaces.ParserOutput<F, G, A>> {
@@ -268,7 +271,10 @@ export default abstract class Command {
     // the spread operator doesn't work with getters so we have to manually add it here
     opts.flags = options?.flags
     opts.args = options?.args
-    return Parser.parse(argv, opts)
+    const results = await Parser.parse<F, G, A>(argv, opts)
+    this.warnIfFlagDeprecated(results.flags ?? {})
+
+    return results
   }
 
   protected async catch(err: Interfaces.CommandError): Promise<any> {

test/command/command.test.ts

@@ -246,18 +246,47 @@ describe('command', () => {
               version: '2.0.0',
             },
           }),
+          force: Flags.boolean(),
         }
 
         async run() {
+          await this.parse(CMD)
           this.log('running command')
         }
       }
-      await CMD.run([])
+      await CMD.run(['--name', 'astro'])
     })
     .do(ctx => expect(ctx.stderr).to.include('Warning: The "name" flag has been deprecated'))
     .it('shows warning for deprecated flags')
   })
 
+  describe('deprecated flags that are not provided', () => {
+    fancy
+    .stdout()
+    .stderr()
+    .do(async () => {
+      class CMD extends Command {
+        static flags = {
+          name: Flags.string({
+            deprecated: {
+              to: '--full-name',
+              version: '2.0.0',
+            },
+          }),
+          force: Flags.boolean(),
+        }
+
+        async run() {
+          await this.parse(CMD)
+          this.log('running command')
+        }
+      }
+      await CMD.run(['--force'])
+    })
+    .do(ctx => expect(ctx.stderr).to.not.include('Warning: The "name" flag has been deprecated'))
+    .it('does not show warning for deprecated flags if they are not provided')
+  })
+
   describe('deprecated state', () => {
     fancy
     .stdout()
@@ -273,7 +302,7 @@ describe('command', () => {
       await CMD.run([])
     })
     .do(ctx => expect(ctx.stderr).to.include('Warning: The "my:command" command has been deprecated'))
-    .it('shows warning for deprecated flags')
+    .it('shows warning for deprecated command')
   })
 
   describe('deprecated state with options', () => {
@@ -300,7 +329,7 @@ describe('command', () => {
       expect(ctx.stderr).to.include('in version 2.0.0')
       expect(ctx.stderr).to.include('Use "my:other:command" instead')
     })
-    .it('shows warning for deprecated flags')
+    .it('shows warning for deprecated command with custom options')
   })
 
   describe('stdout err', () => {