Index: frontend/node_modules/v8-to-istanbul/index.d.ts
===================================================================
--- frontend/node_modules/v8-to-istanbul/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/v8-to-istanbul/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,25 @@
+/// <reference types="node" />
+
+import { Profiler } from 'inspector'
+import { CoverageMapData } from 'istanbul-lib-coverage'
+import { RawSourceMap } from 'source-map'
+
+declare type Sources =
+  | {
+      source: string
+    }
+  | {
+      source: string
+      originalSource: string
+      sourceMap: { sourcemap: RawSourceMap }
+    }
+declare class V8ToIstanbul {
+  load(): Promise<void>
+  destroy(): void
+  applyCoverage(blocks: ReadonlyArray<Profiler.FunctionCoverage>): void
+  toIstanbul(): CoverageMapData
+}
+
+declare function v8ToIstanbul(scriptPath: string, wrapperLength?: number, sources?: Sources, excludePath?: (path: string) => boolean): V8ToIstanbul
+
+export = v8ToIstanbul