Use CompilerInfo[] in a couple places that were previously any or never (#6029)

Depends on #6028

app.ts

@@ -68,6 +68,7 @@ import {loadSponsorsFromString} from './lib/sponsors.js';
 import {getStorageTypeByKey} from './lib/storage/index.js';
 import * as utils from './lib/utils.js';
 import {ElementType} from './shared/common-utils.js';
+import {CompilerInfo} from './types/compiler.interfaces.js';
 import type {Language, LanguageKey} from './types/languages.interfaces.js';
 
 // Used by assert.ts
@@ -525,7 +526,7 @@ async function main() {
     if (gitReleaseName) logger.info(`  git release ${gitReleaseName}`);
     if (releaseBuildNumber) logger.info(`  release build ${releaseBuildNumber}`);
 
-    let initialCompilers;
+    let initialCompilers: CompilerInfo[];
     let prevCompilers;
 
     if (opts.prediscovered) {
@@ -581,7 +582,7 @@ async function main() {
     const noscriptHandler = new NoScriptHandler(router, global.handler_config);
     const routeApi = new RouteAPI(router, global.handler_config);
 
-    async function onCompilerChange(compilers) {
+    async function onCompilerChange(compilers: CompilerInfo[]) {
         if (JSON.stringify(prevCompilers) === JSON.stringify(compilers)) {
             return;
         }