prefer-ts-extras-object-from-entries

Prefer objectFromEntries from ts-extras over Object.fromEntries(...).

objectFromEntries(...) preserves stronger key/value typing and avoids local casting after entry reconstruction.

Targeted pattern scope

This rule focuses on direct Object.fromEntries(entries) calls that can be migrated to objectFromEntries(entries) with deterministic fixes.

Object.fromEntries(entries) call sites that can use objectFromEntries(entries).

Alias indirection, wrapper helpers, and non-canonical call shapes are excluded to keep objectFromEntries(entries) migrations safe.

What this rule reports

This rule reports Object.fromEntries(entries) call sites when objectFromEntries(entries) is the intended replacement.

Object.fromEntries(entries) call sites that can use objectFromEntries(entries).

Why this rule exists

objectFromEntries improves the reconstructed object type when building objects from typed entry tuples.

Reconstructed key/value relationships are preserved more consistently.
Follow-up casting after reconstruction is needed less often.
Object reconstruction uses one explicit helper across modules.

❌ Incorrect

const statusById = Object.fromEntries(statusEntries);

✅ Correct

const statusById = objectFromEntries(statusEntries);

Behavior and migration notes

Runtime semantics align with Object.fromEntries.
Duplicate keys keep the last assigned entry, matching native behavior.
Input must still be iterable entry pairs ([key, value]).
If your entries are already widened to [string, unknown], resulting object types remain broad.

Additional examples

❌ Incorrect — Additional example

const config = Object.fromEntries(entries);

✅ Correct — Additional example

const config = objectFromEntries(entries);

✅ Correct — Repository-wide usage

const grouped = objectFromEntries(pairs);

ESLint flat config example

import typefest from "eslint-plugin-typefest";

export default [
    {
        plugins: { typefest },
        rules: {
            "typefest/prefer-ts-extras-object-from-entries": "error",
        },
    },
];

When not to use it

Disable this rule if you must keep direct Object.fromEntries calls for interop or platform constraints.

Package documentation

ts-extras package documentation:

Source file: source/object-from-entries.ts

/**
A strongly-typed version of `Object.fromEntries()`.

This is useful since `Object.fromEntries()` always returns `{[key: string]: T}`. This function returns a strongly-typed object from the given array of entries.

- [TypeScript issues about this](https://github.com/microsoft/TypeScript/issues/35745)

@example
```
import {objectFromEntries} from 'ts-extras';

const stronglyTypedObjectFromEntries = objectFromEntries([
    ['a', 123],
    ['b', 'someString'],
    ['c', true],
]);
//=> {a: number; b: string; c: boolean}

const untypedEntries = Object.fromEntries([['a', 123], ['b', 'someString'], ['c', true]]);
//=> {[key: string]: unknown}
```

@category Improved builtin
*/

Rule catalog ID: R027

prefer-ts-extras-object-from-entries

Targeted pattern scope

What this rule reports

Why this rule exists

❌ Incorrect

✅ Correct

Behavior and migration notes

Additional examples

❌ Incorrect — Additional example

✅ Correct — Additional example

✅ Correct — Repository-wide usage

ESLint flat config example

When not to use it

Package documentation

Further reading

Adoption resources

Targeted pattern scope​

What this rule reports​

Why this rule exists​

❌ Incorrect​

✅ Correct​

Behavior and migration notes​

Additional examples​

❌ Incorrect — Additional example​

✅ Correct — Additional example​

✅ Correct — Repository-wide usage​

ESLint flat config example​

When not to use it​

Package documentation​

Further reading​

Adoption resources​

Targeted pattern scope

What this rule reports

Why this rule exists

❌ Incorrect

✅ Correct

Behavior and migration notes

Additional examples

❌ Incorrect — Additional example

✅ Correct — Additional example

✅ Correct — Repository-wide usage

ESLint flat config example

When not to use it

Package documentation

Further reading

Adoption resources