reimplement github action in typescript

src/cache.ts

@@ -0,0 +1,29 @@
+import * as core from "@actions/core"
+import restore from "cache/lib/restore"
+import save from "cache/lib/save"
+
+// TODO: ensure dir exists, have access, etc
+const getCacheDir = (): string => `${process.env.HOME}/.cache/golangci-lint`
+
+const setCacheInputs = (): void => {
+  process.env.INPUT_KEY = `golangci-lint.analysis-cache`
+  process.env.INPUT_PATH = getCacheDir()
+}
+
+export async function restoreCache(): Promise<void> {
+  const startedAt = Date.now()
+  setCacheInputs()
+
+  // Tell golangci-lint to use our cache directory.
+  process.env.GOLANGCI_LINT_CACHE = getCacheDir()
+
+  await restore()
+  core.info(`Restored golangci-lint analysis cache in ${Date.now() - startedAt}ms`)
+}
+
+export async function saveCache(): Promise<void> {
+  const startedAt = Date.now()
+  setCacheInputs()
+  await save()
+  core.info(`Saved golangci-lint analysis cache in ${Date.now() - startedAt}ms`)
+}