feat: expo user agent

package.json

@@ -29,7 +29,8 @@
     "prepare": "bob build",
     "example": "yarn --cwd example",
     "pods": "cd example && pod-install --quiet",
-    "bootstrap": "yarn example && yarn && yarn pods"
+    "bootstrap": "yarn example && yarn && yarn pods",
+    "postinstall": "node src/postInstall.js"
   },
   "keywords": [
     "react-native",

src/postInstall.js

@@ -0,0 +1,43 @@
+const fs = require('fs');
+
+// set package.json file paths
+const expoPJsonFile = `${__dirname}/../../customerio-expo-plugin/package.json`;
+const rnPJsonFile = `${__dirname}/../package.json`;
+
+// check if expo plugin is installed
+if (fs.existsSync(expoPJsonFile)) {
+  // try and catch to revent errors
+  try {
+    // read package.json file for current package
+    const rnPJson = fs.readFileSync(rnPJsonFile, 'utf8');
+
+    // import expo plugin's package.json
+    const expoPJson = require(expoPJsonFile);
+
+    // set regular expression for expo version
+    const expoVersionSnippet = `"expoVersion": "${expoPJson.version}"`;
+    const versionRegEx = new RegExp(expoVersionSnippet);
+
+    // split package.json lines into array
+    const lines = rnPJson.split('\n');
+
+    const missingMmatch = rnPJson.match(versionRegEx);
+    const expoVersionRegex = /"expoVersion": ".*"/;
+    const existatch = rnPJson.match(expoVersionRegex);
+
+    // check if expoVersion key exists in current package and it has not been set already
+    if (existatch && !missingMmatch) {
+      const index = lines.findIndex((line) => expoVersionRegex.test(line));
+
+      // set react native SDK expoVersion to current version in expo plugin package
+      const content = [
+        ...lines.slice(0, index),
+        `  ${expoVersionSnippet},`,
+        ...lines.slice(index + 1),
+      ];
+
+      // save react native SDK package.json file
+      fs.writeFileSync(rnPJsonFile, content.join('\n'), 'utf8');
+    }
+  } catch (error) {} // do nothing if this operation fails
+}