fix(web-api): add channel_id to canvases.create method

.changeset/three-turtles-battle.md

@@ -0,0 +1,5 @@
+---
+"@slack/web-api": patch
+---
+
+fix(web-api): add channel_id to canvases.create method

packages/web-api/src/types/request/canvas.ts

@@ -65,12 +65,13 @@ export interface CanvasesAccessSetArguments extends CanvasID, Partial<ChannelIDs
 
 // https://docs.slack.dev/reference/methods/canvases.create
 export type CanvasesCreateArguments = OptionalArgument<
-  TokenOverridable & {
-    /** @description Title of the newly created canvas. */
-    title?: string;
-    /** @description Structure describing the type and contents of the Canvas being created. */
-    document_content?: DocumentContent;
-  }
+  TokenOverridable &
+    Partial<ChannelID> & {
+      /** @description Title of the newly created canvas. */
+      title?: string;
+      /** @description Structure describing the type and contents of the Canvas being created. */
+      document_content?: DocumentContent;
+    }
 >;
 
 // https://docs.slack.dev/reference/methods/canvases.sections.lookup

packages/web-api/test/types/methods/canvas.test-d.ts

@@ -51,6 +51,20 @@ expectError(
 // -- happy path
 expectAssignable<Parameters<typeof web.canvases.create>>([]); // no arg ok
 expectAssignable<Parameters<typeof web.canvases.create>>([{}]); // all optional args
+expectAssignable<Parameters<typeof web.canvases.create>>([{ title: 'My canvas' }]); // with title
+expectAssignable<Parameters<typeof web.canvases.create>>([
+  {
+    document_content: {
+      type: 'markdown',
+      markdown: '# Hello', // with document_content
+    },
+  },
+]);
+expectAssignable<Parameters<typeof web.canvases.create>>([
+  {
+    channel_id: 'C1234', // with channel_id
+  },
+]);
 
 // canvases.sections.lookup
 // -- sad path