Use new json2csv api

Author: ScriptSmith

package-lock.json

@@ -47,7 +47,7 @@
         "fp-ts": "^2.5.3",
         "io-ts": "^2.1.3",
         "io-ts-excess": "^1.0.1",
-        "json2csv": "^4.5.4",
+        "json2csv": "^5.0.0",
         "lodash": "^4.17.15",
         "puppeteer": "^2.1.1",
         "tmp": "^0.1.0",
@@ -67,7 +67,7 @@
         "@types/concat-stream": "^1.6.0",
         "@types/express": "^4.17.6",
         "@types/jest": "^25.2.1",
-        "@types/json2csv": "^4.5.1",
+        "@types/json2csv": "^5.0.0",
         "@types/node": "^13.11.1",
         "@types/puppeteer": "^2.0.1",
         "@types/tmp": "^0.1.0",

package.json

@@ -1,6 +1,6 @@
 import axios from "axios";
 import * as fs from "fs";
-import * as json2csv from "json2csv";
+import {Parser, transforms} from "json2csv";
 import * as winston from "winston";
 
 interface IDownload {
@@ -50,7 +50,7 @@ export async function download(
  * Save list of posts to a CSV file
  */
 export async function toCSV(posts: object[], filePath: string) {
-    const parser = new json2csv.Parser({flatten: true});
+    const parser = new Parser({transforms: [transforms.flatten()]});
     const csv = parser.parse(posts);
     fs.writeFileSync(filePath, csv);
 }