fix: register aliases from Root CLI when mounted via cli.command()

.changeset/fix-root-cli-command-aliases.md

@@ -0,0 +1,5 @@
+---
+"incur": patch
+---
+
+Fixed Root CLIs created with `Cli.create` and `aliases` not registering those aliases as command aliases when mounted via `cli.command()`.

src/Cli.test.ts

@@ -4617,4 +4617,15 @@ describe('command aliases', () => {
     const { output } = await serve(makeAliasedCli(), ['exten'])
     expect(output).toMatch(/did you mean.*extension/i)
   })
+
+  test('root CLI aliases register as command aliases', async () => {
+    const update = Cli.create('update', {
+      aliases: ['upgrade'],
+      description: 'Update packages',
+      run: () => ({ result: 'updated' }),
+    })
+    const cli = Cli.create('pkg').command(update)
+    const { output } = await serve(cli, ['upgrade'])
+    expect(output).toContain('updated')
+  })
 })

src/Cli.ts

@@ -252,6 +252,9 @@ export function create(
       const mountedRootDef = toRootDefinition.get(nameOrCli)
       if (mountedRootDef) {
         commands.set(nameOrCli.name, mountedRootDef)
+        const rootAliases = toRootAliases.get(nameOrCli)
+        if (rootAliases)
+          for (const a of rootAliases) commands.set(a, { _alias: true, target: nameOrCli.name })
         return cli
       }
       const sub = nameOrCli as Cli
@@ -308,6 +311,7 @@ export function create(
   }
 
   if (rootDef) toRootDefinition.set(cli as unknown as Root, rootDef)
+  if (rootDef && def.aliases) toRootAliases.set(cli as unknown as Root, def.aliases)
   if (def.options) toRootOptions.set(cli, def.options)
   if (def.config !== undefined) toConfigEnabled.set(cli, true)
   if (def.outputPolicy) toOutputPolicy.set(cli, def.outputPolicy)
@@ -2414,6 +2418,9 @@ export const toConfigEnabled = new WeakMap<Cli, boolean>()
 /** @internal Maps CLI instances to their output policy. */
 const toOutputPolicy = new WeakMap<Cli, OutputPolicy>()
 
+/** @internal Maps root CLI instances to their command aliases. */
+const toRootAliases = new WeakMap<Root, string[]>()
+
 /** @internal Sentinel symbol for `ok()` and `error()` return values. */
 const sentinel = Symbol.for('incur.sentinel')