First concept

node_modules/next/dist/server/lib/revalidate.d.ts

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+/**
+ * The revalidate option used internally for pages. A value of `false` means
+ * that the page should not be revalidated. A number means that the page
+ * should be revalidated after the given number of seconds (this also includes
+ * `1` which means to revalidate after 1 second). A value of `0` is not a valid
+ * value for this option.
+ */
+export type Revalidate = number | false;
+export type SwrDelta = number;
+export declare function formatRevalidate({ revalidate, swrDelta, }: {
+    revalidate: Revalidate;
+    swrDelta?: SwrDelta;
+}): string;