Follow pattern used by EventMetadata instead

src/Slack/BlockKit/Builder.php

@@ -3,17 +3,22 @@
 namespace Illuminate\Notifications\Slack\BlockKit;
 
 
-use Illuminate\Notifications\Slack\Contracts\BuilderContract;
+use Illuminate\Contracts\Support\Arrayable;
 use JsonException;
 
-class Builder implements BuilderContract
+class Builder implements Arrayable
 {
-    protected string $payload = "[]";
-
-    public function payload(string $payload): self{
-        $this->payload = $payload;
+    public function __construct(
+        protected string $payload = "[]"
+    ){
+    }
 
-        return $this;
+    /**
+     * Fluently create a new Builder instance.
+     */
+    public static function make(string $payload): self
+    {
+        return new self($payload);
     }
 
     /**

src/Slack/SlackMessage.php

@@ -12,7 +12,6 @@
 use Illuminate\Notifications\Slack\BlockKit\Blocks\SectionBlock;
 use Illuminate\Notifications\Slack\BlockKit\Builder;
 use Illuminate\Notifications\Slack\Contracts\BlockContract;
-use Illuminate\Notifications\Slack\Contracts\BuilderContract;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Traits\Conditionable;
 use LogicException;
@@ -83,7 +82,7 @@ class SlackMessage implements Arrayable
      */
     protected ?bool $broadcastReply = null;
 
-    protected ?BuilderContract $builder = null;
+    protected ?Builder $builder = null;
 
     /**
      * Set the Slack channel the message should be sent to.
@@ -99,10 +98,8 @@ public function to(string $channel): self
     /**
      * Set the Block Kit Builder json payload.
      */
-    public function builder(BuilderContract|string $builder): self{
-        $this->builder = $builder instanceof BuilderContract
-            ? $builder
-            : (new Builder)->payload($builder);
+    public function builder(string $payload): self{
+        $this->builder = new Builder($payload);
 
         return $this;
     }

tests/Slack/Unit/BuilderTest.php

@@ -2,20 +2,16 @@
 
 namespace Illuminate\Tests\Notifications\Slack\Unit;
 
-use Illuminate\Notifications\Slack\BlockKit\Blocks\SectionBlock;
 use Illuminate\Notifications\Slack\BlockKit\Builder;
-use Illuminate\Notifications\Slack\BlockKit\Elements\ImageElement;
 use Illuminate\Tests\Notifications\Slack\TestCase;
 use JsonException;
-use LogicException;
 
 class BuilderTest extends TestCase
 {
     /** @test */
     public function it_is_arrayable_and_removes_the_blocks_key(): void
     {
-        $builder = new Builder();
-        $builder->payload(<<<JSON
+        $builder = new Builder(<<<JSON
             {
                 "blocks": [
                     {
@@ -59,8 +55,7 @@ public function it_throws_an_exception_if_payload_is_invalid_json(): void
     {
         $this->expectException(JsonException::class);
 
-        $builder = new Builder();
-        $builder->payload("!!!");
+        $builder = new Builder("!!!");
         $builder->toArray();
     }
 }