ttypescript
Over TypeScript tool for custom transformers in tsconfig.json
- Status
- UnmaintainedNo commits in 1160 days.
- Last checked
- Checked · Oct 13, 2026
- License
- Open source
- Pricing
- Free tier · from $0
What it is
ttypescript is an extension over TypeScript that allows the use of custom transformers specified in the tsconfig.json file, enhancing the capabilities of TypeScript.
ttypescript stands out by providing an easy way to extend TypeScript with custom transformers, making it ideal for projects that require additional type checking or syntax transformations without altering the core TypeScript environment.
When it fits — and when it doesn’t
A good fit for
Developers who need to extend TypeScript functionality without modifying core TypeScript
Projects requiring custom syntax or transformations in their TypeScript codebase
Teams working on complex projects where additional type checking is beneficial
Look elsewhere if
Users looking for a complete IDE solution (ttypescript is a library extension)
Developers who prefer not to modify tsconfig.json for project setup
Known weaknesses
Each one links to the public issue, changelog or docs page it came from, where we have one.
- 01
Steep learning curve for non-TypeScript developers
Requires deep understanding of TypeScript's compiler API and custom transformers.
- 02
Limited documentation and community support
The project relies heavily on the core TypeScript documentation, lacking detailed guides for ttypescript-specific features.
- 03
Performance overhead due to transformer execution
Custom transformers can introduce significant build-time overhead, especially in large projects with many files.
- 04
Complex setup and configuration
Integrating ttypescript requires modifying tsconfig.json and potentially setting up additional scripts or configurations for transformer management.
What it does well
Allows the use of custom transformers in tsconfig.json
Extends TypeScript capabilities without modifying core TypeScript
Supports integration with existing TypeScript projects
Pricing
- Free tier
- YesOpen source — free to use
- Paid from
- $0
- Model
- Flat rate
- Enterprise plan
- No
Pricing not independently confirmed — check the vendor’s page.
Performance benchmarks
How Fast Is It?
Set up ttypescript
Setup steps, common gotchas and what to check after 30 days.
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