diff --git a/polygerrit-ui/app/api/diff.ts b/polygerrit-ui/app/api/diff.ts
index 90cf17b..945afe4 100644
--- a/polygerrit-ui/app/api/diff.ts
+++ b/polygerrit-ui/app/api/diff.ts
@@ -306,12 +306,12 @@
   code_range: LineRange;
 }
 
-export interface FileRange {
+export declare interface FileRange {
   basePath?: string;
   path: string;
 }
 
-export interface PatchRange {
+export declare interface PatchRange {
   patchNum: RevisionPatchSetNum;
   basePatchNum: BasePatchSetNum;
 }
diff --git a/polygerrit-ui/app/api/rest-api.ts b/polygerrit-ui/app/api/rest-api.ts
index a99771b..25d8ad6 100644
--- a/polygerrit-ui/app/api/rest-api.ts
+++ b/polygerrit-ui/app/api/rest-api.ts
@@ -522,7 +522,7 @@
  * The CommentInfo entity contains information about an inline comment.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#comment-info
  */
-export interface CommentInfo {
+export declare interface CommentInfo {
   id: UrlEncodedCommentId;
   updated: Timestamp;
   // TODO(TS): Make this required. Every comment must have patch_set set.
@@ -613,7 +613,7 @@
  * The ContextLine entity contains the line number and line text of a single line of the source file content.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#context-line
  */
-export interface ContextLine {
+export declare interface ContextLine {
   line_number: number;
   context_line: string;
 }
@@ -1301,7 +1301,7 @@
  * The FixSuggestionInfo entity represents a suggested fix
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#fix-suggestion-info
  */
-export interface FixSuggestionInfoInput {
+export declare interface FixSuggestionInfoInput {
   description: string;
   replacements: FixReplacementInfo[];
 }
@@ -1310,7 +1310,7 @@
  * The FixReplacementInfo entity describes how the content of a file should be replaced by another content
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#fix-replacement-info
  */
-export interface FixReplacementInfo {
+export declare interface FixReplacementInfo {
   path: string;
   range: CommentRange;
   replacement: string;
@@ -1318,7 +1318,7 @@
 // The UUID of the suggested fix.
 export type FixId = BrandType<string, '_fixId'>;
 
-export interface FixSuggestionInfo extends FixSuggestionInfoInput {
+export declare interface FixSuggestionInfo extends FixSuggestionInfoInput {
   fix_id: FixId;
   description: string;
   replacements: FixReplacementInfo[];
diff --git a/polygerrit-ui/app/types/common.ts b/polygerrit-ui/app/types/common.ts
index 720899f..b25398f 100644
--- a/polygerrit-ui/app/types/common.ts
+++ b/polygerrit-ui/app/types/common.ts
@@ -1633,7 +1633,7 @@
  * The RelatedChangesInfo entity contains information about related changes.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#related-changes-info
  */
-export interface RelatedChangesInfo {
+export declare interface RelatedChangesInfo {
   changes: RelatedChangeAndCommitInfo[];
 }
 
@@ -1641,7 +1641,7 @@
  * The RelatedChangeAndCommitInfo entity contains information about a related change and commit.
  * https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#related-change-and-commit-info
  */
-export interface RelatedChangeAndCommitInfo {
+export declare interface RelatedChangeAndCommitInfo {
   project: RepoName;
   change_id?: ChangeId;
   commit: CommitInfoWithRequiredCommit;