diff --git a/types/ndn-js/blob.d.ts b/types/ndn-js/blob.d.ts
index 8b6b43b8aa..9b3d56bb67 100644
--- a/types/ndn-js/blob.d.ts
+++ b/types/ndn-js/blob.d.ts
@@ -1,7 +1,7 @@
 export class Blob {
     constructor(value?: Blob);
     constructor(value: Buffer, copy?: boolean);
-    constructor(value: number[]|string);
+    constructor(value: ReadonlyArray<number>|string);
 
     buf(): Buffer;
     equals(other: Blob): boolean;
@@ -11,7 +11,7 @@ export class Blob {
 
 export class SignedBlob extends Blob {
     constructor();
-    constructor(value: Blob|Buffer|number[], signedPortionBeginOffset: number, signedPortionEndOffset: number);
+    constructor(value: Blob|Buffer|ReadonlyArray<number>, signedPortionBeginOffset: number, signedPortionEndOffset: number);
 
     getSignedPortionBeginOffset(): number;
     getSignedPortionEndOffset(): number;
diff --git a/types/ndn-js/name.d.ts b/types/ndn-js/name.d.ts
index 4c38617ab5..d27123ad9a 100644
--- a/types/ndn-js/name.d.ts
+++ b/types/ndn-js/name.d.ts
@@ -11,7 +11,7 @@ export type CompareResult = -1|0|1;
 
 export namespace Name {
     class Component {
-        constructor(value?: number[]|ArrayBuffer|Uint8Array|string|Blob, type?: ComponentType, otherTypeCode?: number);
+        constructor(value?: ReadonlyArray<number>|ArrayBuffer|Uint8Array|string|Blob, type?: ComponentType, otherTypeCode?: number);
         constructor(component: Component);
 
         compare(other: Component): CompareResult;
@@ -52,12 +52,12 @@ export namespace Name {
 }
 
 export class Name {
-    constructor(components?: Array<Name.Component|Uint8Array>);
+    constructor(components?: ReadonlyArray<Name.Component|Uint8Array>);
     constructor(uri: string);
     // tslint:disable-next-line unified-signatures
     constructor(name: Name);
 
-    append(value: number[]|ArrayBuffer|Uint8Array|string|Blob, type?: ComponentType, otherTypeCode?: number): Name;
+    append(value: ReadonlyArray<number>|ArrayBuffer|Uint8Array|string|Blob, type?: ComponentType, otherTypeCode?: number): Name;
     append(component: Name.Component): Name;
     // tslint:disable-next-line unified-signatures
     append(name: Name): Name;