kulshekhar/ts-jest

A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript.

7,078

Stars

almost 10 years

Age

Published reviews

Questions

Continuity30% of headline—

Activity on 2 of 90 tracked days in the last 90 and 0 of 30 in the last 30.

Activity pulse

Closure30% of headline—

Merged 0 of 0 PRs opened and closed 0 of 0 issues opened over the last 90 tracked days — PR flow carries 55% of this component, issue flow 45%.

PRs merged (90d)PRs opened (90d)Issues closed (90d)Issues opened (90d)

Shipping20% of headline—

5 releases in the last 180 days, 2 in the last 90 and 0 in the last 30 — a steady cadence scores highest.

Releases

Liveness10% of headline—

Last push 1 days ago — freshness decays as pushes age (roughly halves every 83 days without a push).

Repository

Support burden10% of headline—

Open-issue load isn't tracked for this repo yet.

Open issues Stargazers

Adoption confidence0

Modeled — how confidently teams are adopting this repo. Stargazers

Maintenance quality0

Modeled from PR/issue responsiveness and upkeep signals. Activity pulse

Risk score0

Modeled — lower is better; adoption and continuity risk. Repository

Stays active (30d)0%

Modeled chance the repo stays active over 30 days. Activity pulse

Stays active (90d)0%

Modeled chance the repo stays active over 90 days. Activity pulse

Release rhythm (180d)0

Regularity of releases over the last 180 days. Releases

Maintainer bus risk (90d)0%

Modeled — lower is better; concentration of commits in few maintainers. Contributors graph

Javascript Source Maps

Project Overview

ts-jest is a Jest transformer that compiles TypeScript in Jest pipelines with source map support.

Install jest, typescript, ts-jest, and @types/jest, then run npx ts-jest config:init.

Key Challenges Addressed

It addresses TypeScript/Jest integration friction and improves debugging trace readability.

Your team can migrate JavaScript tests incrementally while keeping established Jest commands and conventions.

Getting Started

Install jest, typescript, ts-jest, and @types/jest, then run npx ts-jest config:init.

Your team should confirm environment prerequisites and CI runtime alignment before scaling usage.

Features and Use Cases

Your team can migrate JavaScript tests incrementally while keeping established Jest commands and conventions.

It is tightly coupled to Jest and TypeScript versions, so coordinated upgrades are required.

Ecosystem and Dependencies

It is tightly coupled to Jest and TypeScript versions, so coordinated upgrades are required.

Architecturally, ts-jest operates at Jest's transformation boundary before test execution.

Architectural Overview

Architecturally, ts-jest operates at Jest's transformation boundary before test execution.

Pros are compatibility and low migration disruption; cons are version-coupling and maintenance coordination.

Pros and Cons

Pros are compatibility and low migration disruption; cons are version-coupling and maintenance coordination.

Your team gets clear strengths and clear operational constraints, so fit depends on your testing scope.

Comparison and Alternatives

Measured 90-day trends for this project and its alternatives.

Weekly star gains

Ts Jest Vitest Playwright Cypress

Full metrics details

GitHub GraphQL current stargazer cohort, reconstructed from starredAt events and totalCount retrieved in one stable pagination walk. GitHub does not expose historical unstar events, so this is not an exact ledger of past star counts.

Ts Jest

180 observed daily rows. Missing days are not fabricated.

Date	Value

Vitest

151 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

180 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

157 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly total

Vitest Playwright Cypress

Full metrics details

GitHub API observation. Historical values render only when the source provides a real observation for that day.

Vitest

GitHub API observation. Historical values render only when the source provides a real observation for that day.

179 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub API observation. Historical values render only when the source provides a real observation for that day.

177 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub API observation. Historical values render only when the source provides a real observation for that day.

68 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly total

Vitest Playwright Cypress

Full metrics details

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

Vitest

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

179 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

177 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

68 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly total

Vitest Playwright Cypress

Full metrics details

GitHub API observation. Historical values render only when the source provides a real observation for that day.

Vitest

GitHub API observation. Historical values render only when the source provides a real observation for that day.

179 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub API observation. Historical values render only when the source provides a real observation for that day.

177 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub API observation. Historical values render only when the source provides a real observation for that day.

68 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly total

Vitest Playwright Cypress

Full metrics details

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

Vitest

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

179 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

177 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

68 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly total

Vitest Playwright Cypress

Full metrics details

GitHub API observation. Historical values render only when the source provides a real observation for that day.

Vitest

GitHub API observation. Historical values render only when the source provides a real observation for that day.

179 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub API observation. Historical values render only when the source provides a real observation for that day.

177 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub API observation. Historical values render only when the source provides a real observation for that day.

68 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly average

Ts Jest Vitest Playwright Cypress

Full metrics details

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

Ts Jest

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Vitest

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub Search pull-request totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly average

Ts Jest Vitest Playwright Cypress

Full metrics details

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

Ts Jest

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Vitest

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub Search issue totals queried for exact UTC days; rolling values are sums of proven daily counts.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly total

Ts Jest Vitest Playwright Cypress

Full metrics details

GitHub release published_at events bucketed by UTC day; drafts are excluded.

Ts Jest

GitHub release published_at events bucketed by UTC day; drafts are excluded.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Vitest

GitHub release published_at events bucketed by UTC day; drafts are excluded.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Playwright

GitHub release published_at events bucketed by UTC day; drafts are excluded.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Cypress

GitHub release published_at events bucketed by UTC day; drafts are excluded.

180 observed daily rows. Missing days are not fabricated.

Date	Value

Weekly average

Ts Jest Vitest Playwright Cypress

Full metrics details

Derived only from GitHub GraphQL starredAt events after daily star totals are reconciled.

Ts Jest

Derived only from GitHub GraphQL starredAt events after daily star totals are reconciled.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.40 × Hot today + 0.40 × Hot week + 0.20 × Breakout.

Same-day multiplier = stars 1d ÷ max(1, stars 7d ÷ 7)
Weekly multiplier = stars 7d ÷ max(1, stars 30d ÷ 30 × 7)
Fortnight multiplier = stars 14d ÷ max(1, stars 90d ÷ 90 × 14)
Hot today = clamp(70 × log-scale(stars 1d, 1000) + 30 × breakout-scale(same-day, 4))
Hot week = clamp(75 × log-scale(stars 7d, 5000) + 25 × breakout-scale(weekly, 3))
Breakout = clamp(35 × breakout-scale(same-day, 4) + 40 × breakout-scale(weekly, 3) + 25 × breakout-scale(fortnight, 2.5))

Date	Stars	Stars 1d	Stars 7d	Stars 14d	Stars 30d	Stars 90d	Same-day multiplier	Weekly multiplier	Fortnight multiplier	Hot today	Hot week	Breakout	Stored score

Vitest

Derived only from GitHub GraphQL starredAt events after daily star totals are reconciled.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.40 × Hot today + 0.40 × Hot week + 0.20 × Breakout.

Same-day multiplier = stars 1d ÷ max(1, stars 7d ÷ 7)
Weekly multiplier = stars 7d ÷ max(1, stars 30d ÷ 30 × 7)
Fortnight multiplier = stars 14d ÷ max(1, stars 90d ÷ 90 × 14)
Hot today = clamp(70 × log-scale(stars 1d, 1000) + 30 × breakout-scale(same-day, 4))
Hot week = clamp(75 × log-scale(stars 7d, 5000) + 25 × breakout-scale(weekly, 3))
Breakout = clamp(35 × breakout-scale(same-day, 4) + 40 × breakout-scale(weekly, 3) + 25 × breakout-scale(fortnight, 2.5))

Date	Stars	Stars 1d	Stars 7d	Stars 14d	Stars 30d	Stars 90d	Same-day multiplier	Weekly multiplier	Fortnight multiplier	Hot today	Hot week	Breakout	Stored score

Playwright

Derived only from GitHub GraphQL starredAt events after daily star totals are reconciled.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.40 × Hot today + 0.40 × Hot week + 0.20 × Breakout.

Same-day multiplier = stars 1d ÷ max(1, stars 7d ÷ 7)
Weekly multiplier = stars 7d ÷ max(1, stars 30d ÷ 30 × 7)
Fortnight multiplier = stars 14d ÷ max(1, stars 90d ÷ 90 × 14)
Hot today = clamp(70 × log-scale(stars 1d, 1000) + 30 × breakout-scale(same-day, 4))
Hot week = clamp(75 × log-scale(stars 7d, 5000) + 25 × breakout-scale(weekly, 3))
Breakout = clamp(35 × breakout-scale(same-day, 4) + 40 × breakout-scale(weekly, 3) + 25 × breakout-scale(fortnight, 2.5))

Date	Stars	Stars 1d	Stars 7d	Stars 14d	Stars 30d	Stars 90d	Same-day multiplier	Weekly multiplier	Fortnight multiplier	Hot today	Hot week	Breakout	Stored score

Cypress

Derived only from GitHub GraphQL starredAt events after daily star totals are reconciled.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.40 × Hot today + 0.40 × Hot week + 0.20 × Breakout.

Same-day multiplier = stars 1d ÷ max(1, stars 7d ÷ 7)
Weekly multiplier = stars 7d ÷ max(1, stars 30d ÷ 30 × 7)
Fortnight multiplier = stars 14d ÷ max(1, stars 90d ÷ 90 × 14)
Hot today = clamp(70 × log-scale(stars 1d, 1000) + 30 × breakout-scale(same-day, 4))
Hot week = clamp(75 × log-scale(stars 7d, 5000) + 25 × breakout-scale(weekly, 3))
Breakout = clamp(35 × breakout-scale(same-day, 4) + 40 × breakout-scale(weekly, 3) + 25 × breakout-scale(fortnight, 2.5))

Date	Stars	Stars 1d	Stars 7d	Stars 14d	Stars 30d	Stars 90d	Same-day multiplier	Weekly multiplier	Fortnight multiplier	Hot today	Hot week	Breakout	Stored score

Weekly average

Ts Jest Vitest Playwright Cypress

Full metrics details

Derived from the displayed continuity, closure, shipping, liveness, and support-burden components.

Ts Jest

Derived from the displayed continuity, closure, shipping, liveness, and support-burden components.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.30 × Continuity + 0.30 × Closure + 0.20 × Shipping + 0.10 × Liveness + 0.10 × Support burden.

Continuity = 35% active ratio 90d + 20% active ratio 30d + 15% PR efficiency 90d + 10% PR efficiency 30d + 10% liveness + 10% observed-history coverage
Closure = 55% PR merge efficiency 90d + 45% issue close efficiency 90d
Shipping = 100 × (20% × release ratio 30d + 30% × release ratio 90d + 50% × release ratio 180d); ratios are releases ÷ 2, 6, and 12, capped at 1
Support burden = 100 − 2 × open issues per 1,000 stars
Liveness = 100 × exp(−pushed days ago ÷ 120)

Stars, issues, pull requests, and releases are daily observations. Pushed-days and license are repository snapshot-derived inputs and are not independent historical GitHub events.

Date	Issues opened	Issues closed	PRs opened	PRs merged	Releases	Stars	Open issues	Pushed days ago	Continuity	Closure	Shipping	Liveness	Support burden	License	Observed days	Missing days	Needs healing	Stored score

Vitest

Derived from the displayed continuity, closure, shipping, liveness, and support-burden components.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.30 × Continuity + 0.30 × Closure + 0.20 × Shipping + 0.10 × Liveness + 0.10 × Support burden.

Continuity = 35% active ratio 90d + 20% active ratio 30d + 15% PR efficiency 90d + 10% PR efficiency 30d + 10% liveness + 10% observed-history coverage
Closure = 55% PR merge efficiency 90d + 45% issue close efficiency 90d
Shipping = 100 × (20% × release ratio 30d + 30% × release ratio 90d + 50% × release ratio 180d); ratios are releases ÷ 2, 6, and 12, capped at 1
Support burden = 100 − 2 × open issues per 1,000 stars
Liveness = 100 × exp(−pushed days ago ÷ 120)

Stars, issues, pull requests, and releases are daily observations. Pushed-days and license are repository snapshot-derived inputs and are not independent historical GitHub events.

Date	Issues opened	Issues closed	PRs opened	PRs merged	Releases	Stars	Open issues	Pushed days ago	Continuity	Closure	Shipping	Liveness	Support burden	License	Observed days	Missing days	Needs healing	Stored score

Playwright

Derived from the displayed continuity, closure, shipping, liveness, and support-burden components.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.30 × Continuity + 0.30 × Closure + 0.20 × Shipping + 0.10 × Liveness + 0.10 × Support burden.

Continuity = 35% active ratio 90d + 20% active ratio 30d + 15% PR efficiency 90d + 10% PR efficiency 30d + 10% liveness + 10% observed-history coverage
Closure = 55% PR merge efficiency 90d + 45% issue close efficiency 90d
Shipping = 100 × (20% × release ratio 30d + 30% × release ratio 90d + 50% × release ratio 180d); ratios are releases ÷ 2, 6, and 12, capped at 1
Support burden = 100 − 2 × open issues per 1,000 stars
Liveness = 100 × exp(−pushed days ago ÷ 120)

Stars, issues, pull requests, and releases are daily observations. Pushed-days and license are repository snapshot-derived inputs and are not independent historical GitHub events.

Date	Issues opened	Issues closed	PRs opened	PRs merged	Releases	Stars	Open issues	Pushed days ago	Continuity	Closure	Shipping	Liveness	Support burden	License	Observed days	Missing days	Needs healing	Stored score

Cypress

Derived from the displayed continuity, closure, shipping, liveness, and support-burden components.

180 observed daily rows. Missing days are not fabricated.

Per-day formula: 0.30 × Continuity + 0.30 × Closure + 0.20 × Shipping + 0.10 × Liveness + 0.10 × Support burden.

Continuity = 35% active ratio 90d + 20% active ratio 30d + 15% PR efficiency 90d + 10% PR efficiency 30d + 10% liveness + 10% observed-history coverage
Closure = 55% PR merge efficiency 90d + 45% issue close efficiency 90d
Shipping = 100 × (20% × release ratio 30d + 30% × release ratio 90d + 50% × release ratio 180d); ratios are releases ÷ 2, 6, and 12, capped at 1
Support burden = 100 − 2 × open issues per 1,000 stars
Liveness = 100 × exp(−pushed days ago ÷ 120)

Stars, issues, pull requests, and releases are daily observations. Pushed-days and license are repository snapshot-derived inputs and are not independent historical GitHub events.

Date	Issues opened	Issues closed	PRs opened	PRs merged	Releases	Stars	Open issues	Pushed days ago	Continuity	Closure	Shipping	Liveness	Support burden	License	Observed days	Missing days	Needs healing	Stored score

Alternatives often compared are Vitest, Playwright, and Cypress.

Project	Repo	Adoption confidence (~6mo)	PRs merged (~6mo)	Star growth (~6mo)
ts-jest	https://github.com/kulshekhar/ts-jest	{{BAR10_ADOPTION_CONFIDENCE_365D:kulshekhar/ts-jest}} {{ADOPTION_CONFIDENCE_365D:kulshekhar/ts-jest}}	{{BAR10_PRS_MERGED_365D:kulshekhar/ts-jest}} {{PRS_MERGED_365D:kulshekhar/ts-jest}}	{{BAR10_STAR_GROWTH_365D:kulshekhar/ts-jest}} {{STAR_GROWTH_365D:kulshekhar/ts-jest}}
Vitest	https://github.com/vitest-dev/vitest	{{BAR10_ADOPTION_CONFIDENCE_365D:vitest-dev/vitest}} {{ADOPTION_CONFIDENCE_365D:vitest-dev/vitest}}	{{BAR10_PRS_MERGED_365D:vitest-dev/vitest}} {{PRS_MERGED_365D:vitest-dev/vitest}}	{{BAR10_STAR_GROWTH_365D:vitest-dev/vitest}} {{STAR_GROWTH_365D:vitest-dev/vitest}}
Playwright	https://github.com/microsoft/playwright	{{BAR10_ADOPTION_CONFIDENCE_365D:microsoft/playwright}} {{ADOPTION_CONFIDENCE_365D:microsoft/playwright}}	{{BAR10_PRS_MERGED_365D:microsoft/playwright}} {{PRS_MERGED_365D:microsoft/playwright}}	{{BAR10_STAR_GROWTH_365D:microsoft/playwright}} {{STAR_GROWTH_365D:microsoft/playwright}}
Cypress	https://github.com/cypress-io/cypress	{{BAR10_ADOPTION_CONFIDENCE_365D:cypress-io/cypress}} {{ADOPTION_CONFIDENCE_365D:cypress-io/cypress}}	{{BAR10_PRS_MERGED_365D:cypress-io/cypress}} {{PRS_MERGED_365D:cypress-io/cypress}}	{{BAR10_STAR_GROWTH_365D:cypress-io/cypress}} {{STAR_GROWTH_365D:cypress-io/cypress}}

Best overall alternative: Vitest. It offers stronger default breadth for most teams.

Conclusion

ts-jest is strongest when Jest is a hard requirement in your team. Keep repository, docs, and discussions.

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kulshekhar/ts-jest

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Project Overview

Key Challenges Addressed

Getting Started

Features and Use Cases

Ecosystem and Dependencies

Architectural Overview

Pros and Cons

Comparison and Alternatives

GitHub stars

Ts Jest

Vitest

Playwright

Cypress

Issues opened

Vitest

Playwright

Cypress

Issues closed

Vitest

Playwright

Cypress

Pull requests opened

Vitest

Playwright

Cypress

Pull requests closed

Vitest

Playwright

Cypress

Pull requests merged

Vitest

Playwright

Cypress

Open/closed pull request ratio

Ts Jest

Vitest

Playwright

Cypress

Open/closed issues ratio

Ts Jest

Vitest

Playwright

Cypress

Releases

Ts Jest

Vitest

Playwright

Cypress

Hotness score

Ts Jest

Vitest

Playwright

Cypress

Reliability score

Ts Jest

Vitest

Playwright

Cypress

Conclusion

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