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This repository was archived by the owner on Sep 1, 2026. It is now read-only.
Expando function namespaces are not merged in declaration files #3970
Description
Steps to reproduce
export function not() {}
not.negate = () => {};
not.toString = () => ' ~ ';Behavior with typescript@6.0
Single namespace declaration is created for all function properties
export declare function not(): void;
export declare namespace not {
var negate: () => void;
var toString: () => string;
}Behavior with tsgo
Each assignment essentially gets its own namespace declaration
export declare function not(): void;
export declare namespace not {
var negate: () => void;
}
export declare namespace not {
var toString: () => string;
}
Activity
jakebailey commentedon May 18, 2026
This is a behavior we largely opted to not bring forward due to the complexity; since this is sort of related to JS d.ts emit expandos, we're currently just emitting namespaces and letting them merge and not doing extra work.
fix(design-system): build `.d.ts` issue after TS 7 migration [AR-7938…