feat(next): BREAKING New curriculum package

curriculum/lib.js

@@ -0,0 +1,33 @@
+const invariant = require('invariant');
+
+const { getChallengesForLang } = require('./getChallenges');
+const { supportedLangs } = require('./utils');
+
+const promises = supportedLangs.map(lang => getChallengesForLang(lang));
+const curricula = Promise.all(promises).then(allLangCurriculum =>
+  allLangCurriculum.reduce(
+    (map, current, i) => ({ ...map, [supportedLangs[i]]: current }),
+    {}
+  )
+);
+
+function validateLang(lang) {
+  invariant(lang, 'Please provide a language');
+  invariant(
+    supportedLangs.includes(lang),
+    `${lang} is not supported
+
+  Supported languages: ${JSON.stringify(supportedLangs, null, 2)}
+
+  `
+  );
+}
+
+async function getCurriculum(lang) {
+  validateLang(lang);
+  const allCurriculum = await curricula;
+  const requested = allCurriculum[lang];
+  return requested;
+}
+
+exports.getChallengesForLang = getCurriculum;