refactor: env config (#769)

config/env.ts

@@ -0,0 +1,39 @@
+import Git from 'simple-git'
+import { isDevelopment } from 'std-env'
+
+export { version } from '../package.json'
+
+/**
+ * Environment variable `PULL_REQUEST` provided by Netlify.
+ * @see {@link https://docs.netlify.com/configure-builds/environment-variables/#git-metadata}
+ *
+ * Whether triggered by a GitHub PR
+ */
+export const isPR = process.env.PULL_REQUEST === 'true'
+
+/**
+ * Environment variable `CONTEXT` provided by Netlify.
+ * @see {@link https://docs.netlify.com/configure-builds/environment-variables/#build-metadata}
+ *
+ * Whether triggered by PR, `deploy-preview` or `dev`.
+ */
+export const isPreview = isPR || process.env.CONTEXT === 'deploy-preview' || process.env.CONTEXT === 'dev'
+
+const git = Git()
+export const getGitInfo = async () => {
+  const branch = await git.revparse(['--abbrev-ref', 'HEAD'])
+  const commit = await git.revparse(['HEAD'])
+  return { branch, commit }
+}
+
+export const getEnv = async () => {
+  const { commit, branch } = await getGitInfo()
+  const env = isDevelopment
+    ? 'dev'
+    : isPreview
+      ? 'preview'
+      : branch === 'main'
+        ? 'main'
+        : 'release'
+  return { commit, branch, env } as const
+}