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Add stricter Object.fromEntries for constructing from const tuples #50203

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Bazyli Brzóska (niieani) wants to merge 4 commits into from
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Add stricter Object.fromEntries for constructing from const tuples #50203

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898810a
Add stricter Object.fromEntries for constructing from const tuples
niieani Aug 6, 2022
7545c59
Target only fixed length tuples
niieani Aug 18, 2022
bef1f02
Move changes to the correct file
niieani Aug 18, 2022
5f38d95
Fix signature
niieani Aug 18, 2022
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6 changes: 5 additions & 1 deletion src/lib/es2019.object.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,11 @@ interface ObjectConstructor {
* Returns an object created by key-value entries for properties and methods
* @param entries An iterable object that contains key-value entries for properties and methods.
*/
fromEntries<T = any>(entries: Iterable<readonly [PropertyKey, T]>): { [k: string]: T };
fromEntries<KeyValue extends readonly [PropertyKey, any]>(
entries: Iterable<KeyValue>,
): [KeyValue] extends [[PropertyKey, any]]
? { [k: string]: KeyValue[1] }
: { [K in KeyValue[0]]: KeyValue extends readonly [K, infer V] ? V : never };

/**
* Returns an object created by key-value entries for properties and methods
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