memo (@shadow-js/web/server)

The server twin of memo: nothing is reactive during a server render, so it computes once, on the first read, and returns the cached value on every later read.

The server twin of memo: nothing is reactive during a server render, so it computes once, on the first read, and returns the cached value on every later read. A call that throws is not cached (the next read runs fn again).

Import#

import { memo } from "@shadow-js/web/server";

Signature#

function memo<T>(fn: () => T): () => T

Parameters#

Name	Description
`fn`	The computation; runs untracked, on the first read.

Returns#

An accessor of the cached value.

Throws#

TypeError from the accessor when fn reads the accessor itself while it runs, instead of recursing. An error fn throws propagates from the read.

Examples#

import { memo } from "@shadow-js/web/server";

const items = [3, 1, 2];
const sorted = memo(() => [...items].sort());
sorted(); // [1, 2, 3], computed now
sorted(); // the same array, cached