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Gathering detailed insights and metrics for lazy-get-decorator

lazy-get-decorator - 3.0.0 | npmpackage.info

lazy-get-decorator

Lazily evaluates a getter on an object and caches the returned value

3.0.0

LGPL-3.0

TypeScript

23.35 kB

4.4

Installations

npm install lazy-get-decorator

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS, ESM

Node Version

20.8.1

NPM Version

10.1.0 Pull Requests

Open

2

Total

215

Closed

53

Merged

160

Issues

Open

0

Total

8

Closed

8

Releases

v3.0.0

Updated on Oct 20, 2023

2.2.1

Updated on Oct 22, 2022

2.2.0

Updated on Apr 21, 2019

2.1.0

Updated on Mar 08, 2019

2.0.0

Updated on Mar 02, 2019

1.2.2

Updated on Sep 05, 2018

View All 14 releases

Languages

TypeScript

JavaScript

TypeScript (96.33%)

JavaScript (3.67%)

Developer

Alorel

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

LGPL-3.0 License

32 Stars

430 Commits

1 Forks

3 Watchers

3 Branches

4 Contributors

Updated on Apr 17, 2025

Maintainers

View All 4 Contributors

Package Meta Information

Latest Version

3.0.0

Package Id

lazy-get-decorator@3.0.0

Unpacked Size

23.35 kB

Size

6.54 kB

File Count

NPM Version

10.1.0

Node Version

20.8.1

Published on

Oct 20, 2023

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

NaN

Compared to previous day

Last Week

NaN

Compared to previous week

Last Month

NaN

Compared to previous month

Last Year

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dev Dependencies

@alorel/eslint-config-base @alorel/eslint-config-typescript @types/chai @types/mocha @types/node @typescript-eslint/eslint-plugin @typescript-eslint/parser chai concurrently doctoc eslint mocha nyc source-map-support ts-node typescript

Lazy Get decorator

Getter decorator that memoises the return value

Installation
Usage
- Options
- Using the result selector
Compatibility
Migrating from v2

Installation

1npm install lazy-get-decorator

Usage

1import {LazyGetter} from 'lazy-get-decorator';
2
3class MyClass {
4  @LazyGetter(/* optional config */)
5  get foo(): number {
6    // ...
7  } 
8  
9  @LazyGetter(/* optional config */)
10  static get bar(): string {
11    // ...
12  }
13}

Options

All options are optional

Name	Type	Default	Description
`global`	`boolean`	`false`	If set to true, the lazy getter triggering on one class instance will end up saving the returned value on all class instances, current and future. Has no effect on static getters.
`select`	`<T, R>(this: T, output: R, self: T) => any`		A function to determine whether we should save the results (returning a truthy value) or continue calling the original getter (returning a falsy value). The default behaviour is to always save the 1st result.

Using the result selector

The following example will save the value only if the counter is 10 or above. The selector executes after the getter function, hence the offset of 1: the current value of 9 is returned and passed on to the result selector, but the counter value is already incremented at this point.

1class MyClass {
2  #counter = 0;
3  
4  @LazyGetter({select: v => v === 9})
5  get timesAccessed(): number {
6    return this.#counter++;
7  }
8}

Compatibility

The library's only goal is to be compatible with Typescript 5 decorators which, at the time of writing, use the 2022-03 stage 3 decorators proposal. If you need experimental TS decorators or can't use a suitable Babel transform just stick to v2 - there are no new features in this release.

Typescript has further gotchas depending on the compiler target you've set.

ES2022 and higher allows you to use a class' method as a result selector:

1class MyClass {
2  static shouldMemoiseStatic = false;
3  shouldMemoiseInstance = true;
4  
5  @LazyGetter({select: MyClass.bar})
6  static get foo() {}
7
8  @LazyGetter({select: MyClass.prototype.bar2})
9  get foo2() {}
10
11  static bar() {
12    return this.shouldMemoiseStatic;
13  }
14  
15  bar2() {
16    return this.shouldMemoiseInstance;
17  }
18}

Attempting to do this on ES2021 or lower will result in a runtime error as of Typescript 5.2.

Migrating from v2

The function signature has changed to accept an object instead of multiple arguments
makeNonConfigurable option removed
setProto option renamed to global
The only officially supported version is now the non-experimental decorators of Typescript 5 - see compatibility
The ability to reset a memoised getter has been removed.
- If you need to do this as part of your unit tests, use a different class every time. The library's test suites have a few variations of this pattern - creating classes through a helper function, running similar tests through a helper function that accepts a class
- If you need this at runtime then it's not a lazy getter you have - add whatever checks you need in your getter's logic and don't decorate it

No vulnerabilities found.

10

Dangerous-Workflow

Determines if the project's GitHub Action workflows avoid dangerous patterns.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

9

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

7

SAST

Determines if the project uses static code analysis.

3

Branch-Protection

Determines if the default and release branches are protected with GitHub's branch protection settings.

3

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

1

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

Reason

dependency not pinned by hash detected -- score normalized to 1

Details

Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/codeql.yml:25: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/codeql.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/codeql.yml:28: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/codeql.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/codeql.yml:34: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/codeql.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/codeql.yml:37: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/codeql.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:157: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:170: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:197: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: third-party GitHubAction not pinned by hash: .github/workflows/core.yml:204: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: third-party GitHubAction not pinned by hash: .github/workflows/core.yml:227: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:17: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:42: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: third-party GitHubAction not pinned by hash: .github/workflows/core.yml:53: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:70: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: third-party GitHubAction not pinned by hash: .github/workflows/core.yml:84: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: third-party GitHubAction not pinned by hash: .github/workflows/core.yml:90: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/core.yml:120: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Warn: third-party GitHubAction not pinned by hash: .github/workflows/core.yml:127: update your workflow using https://app.stepsecurity.io/secureworkflow/Alorel/typescript-lazy-get-decorator/core.yml/master?enable=pin
Info: 0 out of 11 GitHub-owned GitHubAction dependencies pinned
Info: 0 out of 6 third-party GitHubAction dependencies pinned
Info: 1 out of 1 npmCommand dependencies pinned

0

Maintained

Determines if the project is "actively maintained".

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

Score

4.4

/10

Last Scanned on 2025-07-07

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