fix: defined() when parameter is array

@xen-orchestra/defined/.USAGE.md

@@ -8,10 +8,10 @@ defined(undefined, 'foo', 42)
 // Returns 'foo'
 
 defined([undefined, null, 10])
-// Returns [undefined, null, 10]
+// Returns null
 
 defined([undefined, undefined], [undefined, undefined, 10])
-// Returns [undefined, undefined]
+// Returns 10
 
 defined(() => 'bar', 42)
 // Returns 'bar'

@xen-orchestra/defined/README.md

@@ -26,10 +26,10 @@ defined(undefined, 'foo', 42)
 // Returns 'foo'
 
 defined([undefined, null, 10])
-// Returns [undefined, null, 10]
+// Returns null
 
 defined([undefined, undefined], [undefined, undefined, 10])
-// Returns [undefined, undefined]
+// Returns 10
 
 defined(() => 'bar', 42)
 // Returns 'bar'

@xen-orchestra/defined/defined.test.mjs

@@ -8,11 +8,11 @@ describe('Utilities to help handling (possibly) undefined values', () => {
     assert.deepStrictEqual(defined(undefined, 'foo', 42), expected)
   })
   it('should return first non undefined value in array', () => {
-    const expected = [undefined, null, 10]
+    const expected = null
     assert.deepStrictEqual(defined([undefined, null, 10]), expected)
   })
   it('should return first non undefined value in arrays', () => {
-    const expected = [undefined, undefined, undefined]
+    const expected = 10
     assert.deepStrictEqual(defined([undefined, undefined, undefined], [undefined, undefined, 10]), expected)
   })
   it('should return first non undefined value in function', () => {

@xen-orchestra/defined/index.js

@@ -14,15 +14,11 @@
 // ])
 // ```
 function defined() {
-  let args = arguments
-  let n = args.length
-  if (n === 1) {
-    args = arguments[0]
-    n = args.length
-  }
+  const args = [...arguments].flat()
+  const n = args.length
 
   for (let i = 0; i < n; ++i) {
-    let arg = arguments[i]
+    let arg = args[i]
     if (typeof arg === 'function') {
       arg = get(arg)
     }