Polyfill fetch with cross-fetch library (#6)

to be compatible with Node version <20

package.json

@@ -47,6 +47,7 @@
     "@koa/router": "^12.0.0",
     "@solid/access-token-verifier": "^2.0.5",
     "bcryptjs": "^2.4.3",
+    "cross-fetch": "^4.0.0",
     "dotenv": "^16.0.0",
     "koa": "^2.14.2",
     "koa-helmet": "^7.0.2",

src/controllers/integration.ts

@@ -1,4 +1,5 @@
 import { compare, hash } from 'bcryptjs'
+import fetch from 'cross-fetch'
 import crypto from 'crypto'
 import { Middleware } from 'koa'
 import { pick } from 'lodash'

src/helpers.ts

@@ -4,6 +4,7 @@ import {
   generateDpopKeyPair,
 } from '@inrupt/solid-client-authn-core'
 import { expect } from 'chai'
+import fetch from 'cross-fetch'
 import * as uuid from 'uuid'
 
 type Credentials = { email: string; password: string }

src/test/integration-finish.spec.ts

@@ -1,5 +1,6 @@
 import { expect } from 'chai'
 import * as cheerio from 'cheerio'
+import fetch from 'cross-fetch'
 import { describe } from 'mocha'
 import Mail from 'nodemailer/lib/mailer'
 import { SinonSandbox, SinonSpy, createSandbox } from 'sinon'

src/test/integration-start.spec.ts

@@ -1,4 +1,5 @@
 import { expect } from 'chai'
+import fetch from 'cross-fetch'
 import { describe } from 'mocha'
 import Mail from 'nodemailer/lib/mailer'
 import { SinonSandbox, SinonSpy, createSandbox } from 'sinon'

src/test/notification.spec.ts

@@ -1,5 +1,6 @@
 import { expect } from 'chai'
 import * as cheerio from 'cheerio'
+import fetch from 'cross-fetch'
 import { describe } from 'mocha'
 import Mail from 'nodemailer/lib/mailer'
 import { SinonSandbox, SinonSpy, createSandbox } from 'sinon'

src/test/status.spec.ts

@@ -1,5 +1,6 @@
 import { expect } from 'chai'
 import * as cheerio from 'cheerio'
+import fetch from 'cross-fetch'
 import { describe } from 'mocha'
 import Mail from 'nodemailer/lib/mailer'
 import { SinonSandbox, SinonSpy, createSandbox } from 'sinon'