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Overview
ts-essentials is a collection of TypeScript utility types that extends the built-in utility set. DeepPartial, StrictOmit, XOR, Paths, PathValue, Opaque, and related helpers let projects reuse advanced object and union transformations instead of rebuilding them repeatedly.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Use stricter alternatives to built-in utility types
Types such as StrictOmit, StrictExclude, and StrictExtract add stricter constraints around common transformations, helping surface invalid keys and incompatible type operations earlier.
Sources: [1]
Transform nested structures with DeepPartial and DeepReadonly
DeepPartial, DeepRequired, DeepReadonly, and DeepWritable recursively apply modifiers through nested objects and arrays, which is useful for configuration values and update payloads.
Sources: [1]
Express API constraints with XOR, Opaque, Paths, and PathValue
XOR models mutually exclusive alternatives, Opaque supports distinguishable value types, and Paths with PathValue provides type-safe access to nested paths.
Sources: [1]
Best fit
Fits frontends and libraries that repeat complex type operations
It is useful in TypeScript codebases where API responses, form state, configuration objects, or public library types repeatedly need the same type-level transformations.
Sources: [1]
Before adoption
v10.2.1 requires TypeScript 4.5+ and strictNullChecks
The README and package metadata require TypeScript >=4.5, and the README requires strictNullChecks to be enabled. Existing projects with looser null handling should assess the resulting type errors first.
Runtime helpers require a regular dependency
Most utilities are type-only, but the package also contains runtime helpers such as assert and UnreachableCaseError. The README warns that projects using those helpers should install ts-essentials in regular dependencies rather than only devDependencies.
Sources: [1]
Official sources
- [1]ts-essentials v10.2.1 README(2026-10-05)
- [2]ts-essentials v10.2.1 package metadata(2026-10-05)
- [3]ts-essentials v10.2.1 release(2026-10-05)
- [4]ts-essentials MIT license(2026-10-05)
Supplemental curator note
When using only types, the README installs ts-essentials as a development dependency. If you use runtime helpers such as assert or UnreachableCaseError, follow the README warning and keep it in regular dependencies.
Try it in 3 steps
- 1
Install ts-essentials 10.2.1 with TypeScript
Follow the README's type-only setup by installing ts-essentials as a development dependency with a pinned TypeScript compiler.
demo=$(mktemp -d "${TMPDIR:-/tmp}/ts-essentials.XXXXXX") && cd "$demo" && npm init -y >/dev/null && npm install --save-exact --save-dev ts-essentials@10.2.1 typescript@5.9.2 - 2
Enable strictNullChecks and use StrictOmit
Use the required strictNullChecks setting and combine representative utility types in a small example.
printf "%s\n" '{"compilerOptions":{"strict":true,"strictNullChecks":true,"noEmit":true}}' > tsconfig.json && printf "%s\n" "import type {StrictOmit, DeepReadonly} from 'ts-essentials';" "type User = {id: string; profile: {name: string; active: boolean}};" "type PublicUser = StrictOmit<User, 'id'>;" "const user: DeepReadonly<PublicUser> = {profile: {name: 'Ada', active: true}};" "void user;" > index.ts - 3
Type-check the project
Run the compiler without emitting JavaScript and confirm that the ts-essentials declarations resolve correctly.
npx tsc
Growth
Growth trends · Last 30 days
4,078 Stars
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Development activity
Last 90 days · weekly
- Commits (last 30 days)
- 0
- Open PRs
- 1
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Categories and tags
Categories
GitHub data
GitHub dataView detailed GitHub data
GitHub Topics
- typescript
- types
- essentials
- type-level-programming
- toolbox
- Stars
- 4,078
- Forks
- 129
- Watchers
- 10
- Open issues
- 16
- Contributors
- 42
- Owner type
- Organization
- Primary language
- TypeScript
- License
- MIT
- Repository last updated
- Jun 3, 2026
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