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Gathering detailed insights and metrics for @wistudent/jest-each-improved-types

@wistudent/jest-each-improved-types - 2.1.0 | npmpackage.info

@wistudent/jest-each-improved-types

Using recursive conditional types from typescript 4.1 to improve typings of table driven jest-each tests

2.1.0

TypeScript

5.12 kB

2.7

Installations

npm install @wistudent/jest-each-improved-types

Developer Guide

BETA

Typescript

Yes

Module System

CommonJS, ESM

Node Version

18.14.1

NPM Version

9.3.1 Pull Requests

Open

1

Total

279

Closed

33

Merged

245

Issues

Open

0

Total

0

Closed

0

Releases

v2.1.0

Updated on Feb 25, 2023

View All 1 releases

Languages

TypeScript

JavaScript

TypeScript (99.03%)

JavaScript (0.97%)

Developer

WIStudent

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

2 Stars

537 Commits

1 Watchers

2 Branches

1 Contributors

Updated on Feb 25, 2023

Maintainers

View All 1 Contributors

Package Meta Information

Latest Version

2.1.0

Package Id

@wistudent/jest-each-improved-types@2.1.0

Unpacked Size

5.12 kB

Size

1.92 kB

File Count

NPM Version

9.3.1

Node Version

18.14.1

Published on

Feb 25, 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

Peer Dependencies

@jest/globals @jest/types typescript

Dev Dependencies

@jest/globals @jest/types @tsd/typescript jest jest-runner-tsd

jest-each-improved-types

When using .each with the table notation, it is possible to set the type of the test function argument on the .each function as a generic argument:

1import {test, expect} from "@jest/globals";
2
3test.each<{a: string, b: number, expected: boolean}>`
4a      | b    | expected
5${'1'} | ${1} | ${true}
6${'1'} | ${2} | ${false}
7`('some test', ({a, b, expected}) => {
8  expect(a === `${b}`).toBe(expected)
9});

But this only sets the type for the test function argument, it does not ensure that the correct values were used inside the table. The following does not result in a typescript error:

1import {test, expect} from "@jest/globals";
2
3test.each<{a: string, b: number, expected: boolean}>`
4a            | b     | expected
5${undefined} | ${{}} | ${null}
6`('some test', ({a, b, expected}) => {
7  expect(a === `${b}`).toBe(expected)
8});

This package adds an additional way of providing type definitons to .each table tests that ensures that the values used inside the table are compatible with the provided typescript types. It does by reexporting @jest/globals and extending the type definition of the .each function.

1import {test, expect} from "@wistudent/jest-each-improved-types"
2
3test.each<[['a', string], ['b', number], ['expected', boolean]], 2>`
4a      | b    | expected
5${'1'} | ${1} | ${true}
6${'1'} | ${2} | ${false}
7`('some test', ({a, b, expected}) => {
8  expect(a === `${b}`).toBe(expected)
9});

Instead of using an interface as the generic argument, a tuple of Key-Type pairs and the number of rows is used. Using a value with the wrong type inside the table, or the number of values not being (Number of Key-Type pairs * Declared number of rows), will result in a typescript error.

No vulnerabilities found.

10

Dangerous-Workflow

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10

Binary-Artifacts

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5

Pinned-Dependencies

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2

Vulnerabilities

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0

Code-Review

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0

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0

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0

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0

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0

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0

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0

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Score

2.7

/10

Last Scanned on 2025-07-07

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