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build/node_modules/mem/license
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MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
build/node_modules/mem/package.json
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{
"name": "mem",
"version": "8.1.1",
"description": "Memoize functions - An optimization used to speed up consecutive function calls by caching the result of calls with identical input",
"license": "MIT",
"repository": "sindresorhus/mem",
"funding": "https://github.com/sindresorhus/mem?sponsor=1",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "https://sindresorhus.com"
},
"engines": {
"node": ">=10"
},
"scripts": {
"test": "xo && npm run build && tsd && ava",
"build": "del-cli dist && tsc",
"prepack": "npm run build"
},
"main": "dist",
"types": "dist/index.d.ts",
"files": [
"dist/index.js",
"dist/index.d.ts"
],
"keywords": [
"memoize",
"function",
"mem",
"memoization",
"cache",
"caching",
"optimize",
"performance",
"ttl",
"expire",
"promise"
],
"dependencies": {
"map-age-cleaner": "^0.1.3",
"mimic-fn": "^3.1.0"
},
"devDependencies": {
"@ava/typescript": "^1.1.1",
"@sindresorhus/tsconfig": "^0.7.0",
"@types/serialize-javascript": "^4.0.0",
"ava": "^3.15.0",
"del-cli": "^3.0.1",
"delay": "^4.4.0",
"serialize-javascript": "^5.0.1",
"tsd": "^0.13.1",
"typescript": "^4.0.3",
"xo": "^0.38.2"
},
"ava": {
"files": [
"test.ts"
],
"timeout": "1m",
"typescript": {
"rewritePaths": {
"./": "dist/"
}
}
},
"xo": {
"rules": {
"@typescript-eslint/member-ordering": "off",
"@typescript-eslint/no-var-requires": "off",
"@typescript-eslint/no-empty-function": "off"
}
}
}
build/node_modules/mem/readme.md
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# mem
> [Memoize](https://en.wikipedia.org/wiki/Memoization) functions - An optimization used to speed up consecutive function calls by caching the result of calls with identical input
Memory is automatically released when an item expires or the cache is cleared.
By default, **only the first argument is considered** and it only works with [primitives](https://developer.mozilla.org/en-US/docs/Glossary/Primitive). If you need to cache multiple arguments or cache `object`s *by value*, have a look at alternative [caching strategies](#caching-strategy) below.
## Install
```
$ npm install mem
```
## Usage
```js
const mem = require('mem');
let i = 0;
const counter = () => ++i;
const memoized = mem(counter);
memoized('foo');
//=> 1
// Cached as it's the same argument
memoized('foo');
//=> 1
// Not cached anymore as the argument changed
memoized('bar');
//=> 2
memoized('bar');
//=> 2
// Only the first argument is considered by default
memoized('bar', 'foo');
//=> 2
```
##### Works fine with promise returning functions
```js
const mem = require('mem');
let i = 0;
const counter = async () => ++i;
const memoized = mem(counter);
(async () => {
console.log(await memoized());
//=> 1
// The return value didn't increase as it's cached
console.log(await memoized());
//=> 1
})();
```
```js
const mem = require('mem');
const got = require('got');
const delay = require('delay');
const memGot = mem(got, {maxAge: 1000});
(async () => {
await memGot('https://sindresorhus.com');
// This call is cached
await memGot('https://sindresorhus.com');
await delay(2000);
// This call is not cached as the cache has expired
await memGot('https://sindresorhus.com');
})();
```
### Caching strategy
By default, only the first argument is compared via exact equality (`===`) to determine whether a call is identical.
```js
const power = mem((a, b) => Math.power(a, b));
power(2, 2); // => 4, stored in cache with the key 2 (number)
power(2, 3); // => 4, retrieved from cache at key 2 (number), it's wrong
```
You will have to use the `cache` and `cacheKey` options appropriate to your function. In this specific case, the following could work:
```js
const power = mem((a, b) => Math.power(a, b), {
cacheKey: arguments_ => arguments_.join(',')
});
power(2, 2); // => 4, stored in cache with the key '2,2' (both arguments as one string)
power(2, 3); // => 8, stored in cache with the key '2,3'
```
More advanced examples follow.
#### Example: Options-like argument
If your function accepts an object, it won't be memoized out of the box:
```js
const heavyMemoizedOperation = mem(heavyOperation);
heavyMemoizedOperation({full: true}); // Stored in cache with the object as key
heavyMemoizedOperation({full: true}); // Stored in cache with the object as key, again
// The objects look the same but for JS they're two different objects
```
You might want to serialize or hash them, for example using `JSON.stringify` or something like [serialize-javascript](https://github.com/yahoo/serialize-javascript), which can also serialize `RegExp`, `Date` and so on.
```js
const heavyMemoizedOperation = mem(heavyOperation, {cacheKey: JSON.stringify});
heavyMemoizedOperation({full: true}); // Stored in cache with the key '[{"full":true}]' (string)
heavyMemoizedOperation({full: true}); // Retrieved from cache
```
The same solution also works if it accepts multiple serializable objects:
```js
const heavyMemoizedOperation = mem(heavyOperation, {cacheKey: JSON.stringify});
heavyMemoizedOperation('hello', {full: true}); // Stored in cache with the key '["hello",{"full":true}]' (string)
heavyMemoizedOperation('hello', {full: true}); // Retrieved from cache
```
#### Example: Multiple non-serializable arguments
If your function accepts multiple arguments that aren't supported by `JSON.stringify` (e.g. DOM elements and functions), you can instead extend the initial exact equality (`===`) to work on multiple arguments using [`many-keys-map`](https://github.com/fregante/many-keys-map):
```js
const ManyKeysMap = require('many-keys-map');
const addListener = (emitter, eventName, listener) => emitter.on(eventName, listener);
const addOneListener = mem(addListener, {
cacheKey: arguments_ => arguments_, // Use *all* the arguments as key
cache: new ManyKeysMap() // Correctly handles all the arguments for exact equality
});
addOneListener(header, 'click', console.log); // `addListener` is run, and it's cached with the `arguments` array as key
addOneListener(header, 'click', console.log); // `addListener` is not run again
addOneListener(mainContent, 'load', console.log); // `addListener` is run, and it's cached with the `arguments` array as key
```
Better yet, if your function’s arguments are compatible with `WeakMap`, you should use [`deep-weak-map`](https://github.com/futpib/deep-weak-map) instead of `many-keys-map`. This will help avoid memory leaks.
## API
### mem(fn, options?)
#### fn
Type: `Function`
Function to be memoized.
#### options
Type: `object`
##### maxAge
Type: `number`\
Default: `Infinity`
Milliseconds until the cache expires.
##### cacheKey
Type: `Function`\
Default: `arguments_ => arguments_[0]`\
Example: `arguments_ => JSON.stringify(arguments_)`
Determines the cache key for storing the result based on the function arguments. By default, **only the first argument is considered**.
A `cacheKey` function can return any type supported by `Map` (or whatever structure you use in the `cache` option).
Refer to the [caching strategies](#caching-strategy) section for more information.
##### cache
Type: `object`\
Default: `new Map()`
Use a different cache storage. Must implement the following methods: `.has(key)`, `.get(key)`, `.set(key, value)`, `.delete(key)`, and optionally `.clear()`. You could for example use a `WeakMap` instead or [`quick-lru`](https://github.com/sindresorhus/quick-lru) for a LRU cache.
Refer to the [caching strategies](#caching-strategy) section for more information.
### mem.decorator(options)
Returns a [decorator](https://github.com/tc39/proposal-decorators) to memoize class methods or static class methods.
Notes:
- Only class methods and getters/setters can be memoized, not regular functions (they aren't part of the proposal);
- Only [TypeScript’s decorators](https://www.typescriptlang.org/docs/handbook/decorators.html#parameter-decorators) are supported, not [Babel’s](https://babeljs.io/docs/en/babel-plugin-proposal-decorators), which use a different version of the proposal;
- Being an experimental feature, they need to be enabled with `--experimentalDecorators`; follow TypeScript’s docs.
#### options
Type: `object`
Same as options for `mem()`.
```ts
import mem = require('mem');
class Example {
index = 0
@mem.decorator()
counter() {
return ++this.index;
}
}
class ExampleWithOptions {
index = 0
@mem.decorator({maxAge: 1000})
counter() {
return ++this.index;
}
}
```
### mem.clear(fn)
Clear all cached data of a memoized function.
#### fn
Type: `Function`
Memoized function.
## Tips
### Cache statistics
If you want to know how many times your cache had a hit or a miss, you can make use of [stats-map](https://github.com/SamVerschueren/stats-map) as a replacement for the default cache.
#### Example
```js
const mem = require('mem');
const StatsMap = require('stats-map');
const got = require('got');
const cache = new StatsMap();
const memGot = mem(got, {cache});
(async () => {
await memGot('https://sindresorhus.com');
await memGot('https://sindresorhus.com');
await memGot('https://sindresorhus.com');
console.log(cache.stats);
//=> {hits: 2, misses: 1}
})();
```
## Related
- [p-memoize](https://github.com/sindresorhus/p-memoize) - Memoize promise-returning & async functions
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