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@emotion/memoize

@emotion/memoize is a simple and efficient memoization utility function that caches the results of expensive function calls based on string arguments. It provides a lightweight caching mechanism to avoid redundant calculations for functions that accept string parameters.

Package Information

Package Name: @emotion/memoize
Package Type: npm
Language: TypeScript
Installation: npm install @emotion/memoize

Core Imports

import memoize from "@emotion/memoize";

For CommonJS:

const memoize = require("@emotion/memoize");

Basic Usage

import memoize from "@emotion/memoize";

// Define a function that performs expensive computation
function expensiveComputation(input: string): string {
  console.log(`Computing for: ${input}`);
  return input.toUpperCase().repeat(3);
}

// Create a memoized version
const memoizedCompute = memoize(expensiveComputation);

// First call - computation is performed
const result1 = memoizedCompute("hello"); // Logs: "Computing for: hello"
console.log(result1); // "HELLOHELLOHELLO"

// Second call with same input - result is cached
const result2 = memoizedCompute("hello"); // No log - cached result used
console.log(result2); // "HELLOHELLOHELLO"

// Different input - computation is performed
const result3 = memoizedCompute("world"); // Logs: "Computing for: world"
console.log(result3); // "WORLDWORLDWORLD"

// Note: Each memoized function maintains its own cache throughout its lifetime
// The cache uses Object.create(null) to prevent prototype pollution

Capabilities

Memoization Function

Creates a memoized version of a function that caches results based on string arguments.

/**
 * Creates a memoized version of a function that caches results based on string arguments
 * @param fn - Function to memoize that takes a string argument and returns a value
 * @returns Memoized function with the same signature as the input function
 */
function memoize<V>(fn: (arg: string) => V): (arg: string) => V;

Parameters:

fn: A function that accepts a single string argument and returns a value of type V

Returns:

A memoized version of the input function that maintains an internal cache

Type Safety:

The memoized function preserves the exact input and output types of the original function
Generic type parameter V represents the return type of the memoized function

Caching Behavior:

Uses Object.create(null) for the internal cache to avoid prototype pollution
Cache keys are the string arguments passed to the function
Results are cached indefinitely (no expiration or size limits)
Each memoized function maintains its own separate cache instance
Cache persists for the lifetime of the memoized function
Memory usage grows with unique string arguments; consider the function's usage pattern

Usage Examples:

// String transformation
const memoizedUpperCase = memoize((str: string) => str.toUpperCase());
console.log(memoizedUpperCase("hello")); // "HELLO"

// Complex computation returning objects
const memoizedParser = memoize((json: string) => JSON.parse(json));
const obj = memoizedParser('{"name": "John", "age": 30}');

// Function returning arrays
const memoizedSplit = memoize((str: string) => str.split(","));
const parts = memoizedSplit("a,b,c"); // ["a", "b", "c"]

// CSS processing example (common use case in emotion ecosystem)
const memoizedCSSProcessor = memoize((css: string) => {
  // Expensive CSS processing logic
  return css.replace(/\s+/g, " ").trim();
});

Type Information

The memoize function uses TypeScript generics to ensure type safety. The generic type parameter V represents the return type of the function being memoized, preserving the exact type through the memoization process. No additional types are exported by this package.