Fix eventprops trait (#579)

* fix event-properties and traits type

* undefined properties

Co-authored-by: Seth Silesky <silesky@users.noreply.github.com>

Author: silesky

.changeset/popular-beds-design.md

@@ -0,0 +1,5 @@
+---
+'@segment/analytics-next': patch
+---
+
+Fix SegmentEvent and EventProperties and add tests

packages/browser/src/browser/__tests__/typedef-tests/analytics-browser.ts

@@ -74,4 +74,40 @@ export default {
       assertIs<Promise<User>>(grpResult)
     }
   },
+  'Identify should work with spread objects ': () => {
+    const user = {
+      name: 'john',
+      id: 12345,
+    }
+    const { id, ...traits } = user
+    void AnalyticsBrowser.load({ writeKey: 'foo' }).identify('foo', traits)
+  },
+  'Track should work with spread objects': () => {
+    const user = {
+      name: 'john',
+      id: 12345,
+    }
+    const { id, ...traits } = user
+    void AnalyticsBrowser.load({ writeKey: 'foo' }).track('foo', traits)
+  },
+  'Identify should work with generic objects ': () => {
+    const user = {
+      name: 'john',
+      id: 12345,
+    }
+    void AnalyticsBrowser.load({ writeKey: 'foo' }).identify('foo', user)
+  },
+  'Context should have a key allowing arbitrary properties': async () => {
+    const [_, ctx] = await AnalyticsBrowser.load({ writeKey: 'foo' })
+    const properties = ctx.event.properties!
+
+    properties.category.baz = 'hello'
+  },
+  'Track should allow undefined properties': () => {
+    type User = {
+      name?: string
+      thing: 123
+    }
+    void AnalyticsBrowser.load({ writeKey: 'foo' }).track('foo', {} as User)
+  },
 }

packages/browser/src/core/events/interfaces.ts

@@ -100,26 +100,10 @@ interface AnalyticsContext {
   [key: string]: any
 }
 
-// "object" is not ideal, but with JSONObject, we ran into at least one bad edge case around index sig.
+// This is not ideal, but it works with all the edge cases
+export type Traits = Record<string, any>
 
-/**
- * An object literal representing traits
- * - identify: https://segment.com/docs/connections/spec/identify/#traits
- * - group: https://segment.com/docs/connections/spec/group/#traits
- * @example
- *  { name: "john", age: 25 }
- */
-export type Traits = object & JSONObject // intersection adds an index signature
-
-/**
- * An object literal representing Segment event properties
- * - track: https://segment.com/docs/connections/spec/track/#properties
- * - page: https://segment.com/docs/connections/spec/page/#properties
- * - screen: https://segment.com/docs/connections/spec/screen/#properties
- * @example
- *  { artistID: 2435325, songID: 13532532 }
- */
-export type EventProperties = object & JSONObject // intersection adds an index signature
+export type EventProperties = Record<string, any>
 
 export interface SegmentEvent {
   messageId?: string
@@ -129,9 +113,22 @@ export interface SegmentEvent {
   // page specific
   category?: string
   name?: string
-
+  /**
+   * An object literal representing Segment event properties
+   * - track: https://segment.com/docs/connections/spec/track/#properties
+   * - page: https://segment.com/docs/connections/spec/page/#properties
+   * - screen: https://segment.com/docs/connections/spec/screen/#properties
+   * @example
+   *  { artistID: 2435325, songID: 13532532 }
+   */
   properties?: EventProperties
-
+  /**
+   * An object literal representing traits
+   * - identify: https://segment.com/docs/connections/spec/identify/#traits
+   * - group: https://segment.com/docs/connections/spec/group/#traits
+   * @example
+   *  { name: "john", age: 25 }
+   */
   traits?: Traits
 
   integrations?: Integrations