A tool to help migrate JavaScript code quickly and conveniently to TypeScript
TypeScript
5,621
205 commits
updated Jan 22, 2026
ts-migrate is a tool for helping migrate code to TypeScript. It takes a JavaScript, or a partial TypeScript, project in and gives a compiling TypeScript project out.
ts-migrate is intended to accelerate the TypeScript migration process. The resulting code will pass the build, but a followup is required to improve type safety. There will be lots of // @ts-expect-error, and any that will need to be fixed over time. In general, it is a lot nicer than starting from scratch.
ts-migrate is designed as a set of plugins so that it can be pretty customizable for different use-cases. Potentially, more plugins can be added for addressing things like improvements of type quality or libraries-related things (like prop-types in React).
Plugins are combined into migration configs. We currently have two main migration configs:
These configs can be moved out of the default script, and people can add custom configs with a different set of plugins for their needs.
You can find instructions on how to install and run ts-migrate in the main package. If you find any issues or have ideas for improvements, we welcome your contributions!
Check out the blog post about ts-migrate!
| Folder | Version | Package |
|---|---|---|
| packages/ts-migrate |  | ts-migrate |
| packages/ts-migrate-plugins |  | ts-migrate-plugins |
| packages/ts-migrate-server |  | ts-migrate-server |
| Folder | Description |
|---|---|
| packages/ts-migrate-example | basic example of usage of the ts-migrate-server with a writing a custom simple plugin |
MIT, see LICENSE for details.
Overall
Maintained
Code review
npm
Latest release
Releases this year
(top 24 of 62)
718 followers · starred Aug 2020
8,906 followers · starred Aug 2020
670 followers · starred Nov 2023
1,114 followers · starred Jan 2025
A tool to help migrate JavaScript code quickly and conveniently to TypeScript
TypeScript
5,621
205 commits
updated Jan 22, 2026
ts-migrate is a tool for helping migrate code to TypeScript. It takes a JavaScript, or a partial TypeScript, project in and gives a compiling TypeScript project out.
ts-migrate is intended to accelerate the TypeScript migration process. The resulting code will pass the build, but a followup is required to improve type safety. There will be lots of // @ts-expect-error, and any that will need to be fixed over time. In general, it is a lot nicer than starting from scratch.
ts-migrate is designed as a set of plugins so that it can be pretty customizable for different use-cases. Potentially, more plugins can be added for addressing things like improvements of type quality or libraries-related things (like prop-types in React).
Plugins are combined into migration configs. We currently have two main migration configs:
These configs can be moved out of the default script, and people can add custom configs with a different set of plugins for their needs.
You can find instructions on how to install and run ts-migrate in the main package. If you find any issues or have ideas for improvements, we welcome your contributions!
Check out the blog post about ts-migrate!
| Folder | Version | Package |
|---|---|---|
| packages/ts-migrate | | ts-migrate |
| packages/ts-migrate-plugins | | ts-migrate-plugins |
| packages/ts-migrate-server | | ts-migrate-server |
| Folder | Description |
|---|---|
| packages/ts-migrate-example | basic example of usage of the ts-migrate-server with a writing a custom simple plugin |
MIT, see LICENSE for details.
Overall
Maintained
Code review
npm
Latest release
Releases this year
(top 24 of 62)
718 followers · starred Aug 2020
8,906 followers · starred Aug 2020
670 followers · starred Nov 2023
1,114 followers · starred Jan 2025
