diff --git a/crates/codegen/runtime/npm/src/runtime/napi-bindings/generated/index.d.ts b/crates/codegen/runtime/npm/src/runtime/napi-bindings/generated/index.d.ts
index 798b0c4f8f..645beb7cb8 100644
--- a/crates/codegen/runtime/npm/src/runtime/napi-bindings/generated/index.d.ts
+++ b/crates/codegen/runtime/npm/src/runtime/napi-bindings/generated/index.d.ts
@@ -8,7 +8,7 @@
 
 /* auto-generated by NAPI-RS */
 
-export namespace kinds {
+export declare namespace kinds {
   export enum NonterminalKind {
     Stub1 = "Stub1",
     Stub2 = "Stub2",
@@ -35,7 +35,7 @@ export namespace kinds {
     Stub3 = "Stub3",
   }
 }
-export namespace language {
+export declare namespace language {
   export class Language {
     constructor(version: string);
     get version(): string;
@@ -44,7 +44,7 @@ export namespace language {
     parse(kind: kinds.NonterminalKind, input: string): parse_output.ParseOutput;
   }
 }
-export namespace cst {
+export declare namespace cst {
   export enum NodeType {
     Nonterminal = "Nonterminal",
     Terminal = "Terminal",
@@ -69,7 +69,7 @@ export namespace cst {
     createCursor(textOffset: text_index.TextIndex): cursor.Cursor;
   }
 }
-export namespace cursor {
+export declare namespace cursor {
   export class Cursor {
     reset(): void;
     complete(): void;
@@ -100,7 +100,7 @@ export namespace cursor {
     query(queries: Array<query.Query>): query.QueryMatchIterator;
   }
 }
-export namespace diagnostic {
+export declare namespace diagnostic {
   /**
    * Severity of the compiler diagnostic.
    *
@@ -122,14 +122,14 @@ export namespace diagnostic {
     message(): string;
   }
 }
-export namespace parse_error {
+export declare namespace parse_error {
   export class ParseError {
     severity(): diagnostic.Severity;
     textRange(): text_index.TextRange;
     message(): string;
   }
 }
-export namespace parse_output {
+export declare namespace parse_output {
   export class ParseOutput {
     tree(): cst.Node;
     errors(): Array<parse_error.ParseError>;
@@ -138,7 +138,7 @@ export namespace parse_output {
     createTreeCursor(): cursor.Cursor;
   }
 }
-export namespace query {
+export declare namespace query {
   export interface QueryMatch {
     queryNumber: number;
     captures: { [key: string]: cursor.Cursor[] };
@@ -150,7 +150,7 @@ export namespace query {
     next(): QueryMatch | null;
   }
 }
-export namespace text_index {
+export declare namespace text_index {
   export interface TextIndex {
     utf8: number;
     utf16: number;
@@ -162,7 +162,7 @@ export namespace text_index {
     end: TextIndex;
   }
 }
-export namespace ast_internal {
+export declare namespace ast_internal {
   export function selectSequence(node: cst.NonterminalNode): Array<cst.Node | null>;
   export function selectChoice(node: cst.NonterminalNode): cst.Node;
   export function selectRepeated(node: cst.NonterminalNode): Array<cst.Node>;
diff --git a/crates/solidity/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts b/crates/solidity/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts
index b77e5cbcee..0dee205b52 100644
--- a/crates/solidity/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts
+++ b/crates/solidity/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts
@@ -8,7 +8,7 @@
 
 /* auto-generated by NAPI-RS */
 
-export namespace kinds {
+export declare namespace kinds {
   export enum NonterminalKind {
     ABICoderPragma = "ABICoderPragma",
     AdditiveExpression = "AdditiveExpression",
@@ -729,7 +729,7 @@ export namespace kinds {
     YulYearsKeyword = "YulYearsKeyword",
   }
 }
-export namespace language {
+export declare namespace language {
   export class Language {
     constructor(version: string);
     get version(): string;
@@ -738,7 +738,7 @@ export namespace language {
     parse(kind: kinds.NonterminalKind, input: string): parse_output.ParseOutput;
   }
 }
-export namespace cst {
+export declare namespace cst {
   export enum NodeType {
     Nonterminal = "Nonterminal",
     Terminal = "Terminal",
@@ -763,7 +763,7 @@ export namespace cst {
     createCursor(textOffset: text_index.TextIndex): cursor.Cursor;
   }
 }
-export namespace cursor {
+export declare namespace cursor {
   export class Cursor {
     reset(): void;
     complete(): void;
@@ -794,7 +794,7 @@ export namespace cursor {
     query(queries: Array<query.Query>): query.QueryMatchIterator;
   }
 }
-export namespace diagnostic {
+export declare namespace diagnostic {
   /**
    * Severity of the compiler diagnostic.
    *
@@ -816,14 +816,14 @@ export namespace diagnostic {
     message(): string;
   }
 }
-export namespace parse_error {
+export declare namespace parse_error {
   export class ParseError {
     severity(): diagnostic.Severity;
     textRange(): text_index.TextRange;
     message(): string;
   }
 }
-export namespace parse_output {
+export declare namespace parse_output {
   export class ParseOutput {
     tree(): cst.Node;
     errors(): Array<parse_error.ParseError>;
@@ -832,7 +832,7 @@ export namespace parse_output {
     createTreeCursor(): cursor.Cursor;
   }
 }
-export namespace query {
+export declare namespace query {
   export interface QueryMatch {
     queryNumber: number;
     captures: { [key: string]: cursor.Cursor[] };
@@ -844,7 +844,7 @@ export namespace query {
     next(): QueryMatch | null;
   }
 }
-export namespace text_index {
+export declare namespace text_index {
   export interface TextIndex {
     utf8: number;
     utf16: number;
@@ -856,7 +856,7 @@ export namespace text_index {
     end: TextIndex;
   }
 }
-export namespace ast_internal {
+export declare namespace ast_internal {
   export function selectSequence(node: cst.NonterminalNode): Array<cst.Node | null>;
   export function selectChoice(node: cst.NonterminalNode): cst.Node;
   export function selectRepeated(node: cst.NonterminalNode): Array<cst.Node>;
diff --git a/crates/testlang/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts b/crates/testlang/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts
index d21a841c3e..6c9c176629 100644
--- a/crates/testlang/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts
+++ b/crates/testlang/outputs/npm/package/src/generated/napi-bindings/generated/index.d.ts
@@ -8,7 +8,7 @@
 
 /* auto-generated by NAPI-RS */
 
-export namespace kinds {
+export declare namespace kinds {
   export enum NonterminalKind {
     AdditionExpression = "AdditionExpression",
     Expression = "Expression",
@@ -63,7 +63,7 @@ export namespace kinds {
     Whitespace = "Whitespace",
   }
 }
-export namespace language {
+export declare namespace language {
   export class Language {
     constructor(version: string);
     get version(): string;
@@ -72,7 +72,7 @@ export namespace language {
     parse(kind: kinds.NonterminalKind, input: string): parse_output.ParseOutput;
   }
 }
-export namespace cst {
+export declare namespace cst {
   export enum NodeType {
     Nonterminal = "Nonterminal",
     Terminal = "Terminal",
@@ -97,7 +97,7 @@ export namespace cst {
     createCursor(textOffset: text_index.TextIndex): cursor.Cursor;
   }
 }
-export namespace cursor {
+export declare namespace cursor {
   export class Cursor {
     reset(): void;
     complete(): void;
@@ -128,7 +128,7 @@ export namespace cursor {
     query(queries: Array<query.Query>): query.QueryMatchIterator;
   }
 }
-export namespace diagnostic {
+export declare namespace diagnostic {
   /**
    * Severity of the compiler diagnostic.
    *
@@ -150,14 +150,14 @@ export namespace diagnostic {
     message(): string;
   }
 }
-export namespace parse_error {
+export declare namespace parse_error {
   export class ParseError {
     severity(): diagnostic.Severity;
     textRange(): text_index.TextRange;
     message(): string;
   }
 }
-export namespace parse_output {
+export declare namespace parse_output {
   export class ParseOutput {
     tree(): cst.Node;
     errors(): Array<parse_error.ParseError>;
@@ -166,7 +166,7 @@ export namespace parse_output {
     createTreeCursor(): cursor.Cursor;
   }
 }
-export namespace query {
+export declare namespace query {
   export interface QueryMatch {
     queryNumber: number;
     captures: { [key: string]: cursor.Cursor[] };
@@ -178,7 +178,7 @@ export namespace query {
     next(): QueryMatch | null;
   }
 }
-export namespace text_index {
+export declare namespace text_index {
   export interface TextIndex {
     utf8: number;
     utf16: number;
@@ -190,7 +190,7 @@ export namespace text_index {
     end: TextIndex;
   }
 }
-export namespace ast_internal {
+export declare namespace ast_internal {
   export function selectSequence(node: cst.NonterminalNode): Array<cst.Node | null>;
   export function selectChoice(node: cst.NonterminalNode): cst.Node;
   export function selectRepeated(node: cst.NonterminalNode): Array<cst.Node>;