Implement sendSessionData config option

The `sendSessionData` config option allows the user to decide if they
want to send session data to AppSignal. Its default value is `true`.

`Span#setSampleData()` now checks if the `sendSessionData` option is
enabled when sending `session_data` to decide if they're going to be
sent to AppSignal or not.

packages/nodejs/.changesets/skipsessiondata-config-opt-is-now-available.md

@@ -0,0 +1,7 @@
+---
+bump: "patch"
+type: "add"
+---
+
+The `sendSessionData` config option is now available. When set to `false`, it prevents the
+integration from sending session data to AppSignal.

packages/nodejs/src/__tests__/span.test.ts

@@ -192,7 +192,7 @@ describe(".setSampleData()", () => {
     jest.clearAllMocks()
   })
 
-  it("calls the extension with the desired data if sendParams is active", () => {
+  it("calls the extension with the desired params data if sendParams is active", () => {
     new BaseClient({ ...DEFAULT_OPTS })
 
     const rootSpan = new RootSpan()
@@ -209,7 +209,7 @@ describe(".setSampleData()", () => {
     )
   })
 
-  it("does not call the extension with the desired data if sendParams is inactive", () => {
+  it("does not call the extension with the desired params data if sendParams is inactive", () => {
     new BaseClient({ ...DEFAULT_OPTS, sendParams: false })
 
     const rootSpan = new RootSpan()
@@ -221,4 +221,32 @@ describe(".setSampleData()", () => {
 
     expect(spanMock).not.toHaveBeenCalled()
   })
+
+  it("calls the extension with the desired session data if sendSessionData is active", () => {
+    new BaseClient({ ...DEFAULT_OPTS })
+
+    const rootSpan = new RootSpan()
+    const spanMock = jest
+      .spyOn(span, "setSpanSampleData")
+      .mockImplementation(() => {})
+
+    rootSpan.setSampleData("session_data", sampleData)
+
+    expect(spanMock).toHaveBeenCalledWith(
+      {},
+      "session_data",
+      Data.generate(sampleData)
+    )
+  })
+
+  it("does not call the extension with the desired session data if sendSessionData is inactive", () => {
+    new BaseClient({ ...DEFAULT_OPTS, sendSessionData: false })
+
+    const rootSpan = new RootSpan()
+    const spanMock = jest.spyOn(span, "setSpanSampleData")
+
+    rootSpan.setSampleData("session_data", sampleData)
+
+    expect(spanMock).not.toHaveBeenCalled()
+  })
 })

packages/nodejs/src/span.ts

@@ -125,8 +125,10 @@ export class BaseSpan implements Span {
           HashMapValue | Array<HashMapValue> | HashMap<HashMapValue> | undefined
         >
   ): this {
+    const clientConfig = BaseClient.config.data
     if (!key || !data) return this
-    if (key == "params" && !BaseClient.config.data.sendParams) return this
+    if (key == "params" && !clientConfig.sendParams) return this
+    if (key == "session_data" && !clientConfig.sendSessionData) return this
 
     try {
       span.setSpanSampleData(this._ref, key, Data.generate(data))