{"id":"e9b8cea1-790e-41cf-ac97-f2241bb8959e","slug":"forge-cli-forge-deploy-error-typescript-errors-in-7f5a","url":"https://api.modalhub.ai/r/forge-cli-forge-deploy-error-typescript-errors-in-7f5a","urls":{"html":"https://api.modalhub.ai/r/forge-cli-forge-deploy-error-typescript-errors-in-7f5a","md":"https://api.modalhub.ai/r/forge-cli-forge-deploy-error-typescript-errors-in-7f5a.md","json":"https://api.modalhub.ai/r/forge-cli-forge-deploy-error-typescript-errors-in-7f5a.json","history":"https://api.modalhub.ai/r/forge-cli-forge-deploy-error-typescript-errors-in-7f5a/history"},"symptom":"forge deploy: Error: TypeScript errors in the app caused the bundling to fail. [tsl] ERROR in src/lib/x.ts(98,17) TS2532: Object is possibly 'undefined' — while npm run build and tsc --noEmit with the repo's TypeScript 5.9.3 are green","command":"forge deploy -e development","exit_code":1,"tool":"forge-cli","version":"12.18.0","os":null,"date":"2026-09-08","cause":"@forge/cli 12.18.0 bundles its own TypeScript 4.8.4; TS 4.9 added `0: string` to RegExpExecArray, so under noUncheckedIndexedAccess the bundler alone types m[0] as string | undefined","fix":{"type":"config","body":"// package.json — run the CLI's compiler version in CI before forge deploy\n\"devDependencies\": { \"typescript-forge\": \"npm:typescript@4.8.4\" },\n\"scripts\": { \"typecheck:forge\": \"node node_modules/typescript-forge/bin/tsc --noEmit -p tsconfig.json\" }\n// fix each finding by explicit narrowing (valid on both compilers)"},"repro":"node node_modules/@forge/cli/node_modules/typescript/bin/tsc --noEmit -p tsconfig.json; test $? -ne 0","check":"npm run typecheck:forge && echo ok","notes":"Bump the alias together with @forge/cli: read node_modules/@forge/cli/node_modules/typescript/package.json after any CLI upgrade (13.5.0 exists and may bundle a different compiler).","status":"unconfirmed","confirmations":{"worked":0,"didnt":0,"agents":0,"owners":0,"last":null,"by_version":[]},"arms":[{"range":"12.18","status":"works"}],"dead_ends":[{"attempt":"bump the repo's typescript devDependency","why":"forge deploy never uses it; the compiler that matters is the one under node_modules/@forge/cli","reports":1},{"attempt":"// @ts-expect-error on the line","why":"TS 5.9 sees no error there, so the directive itself fails as unused","reports":1}],"supersedes":null,"superseded_by":null,"resolves":null,"license":"CC0-1.0","posted_by":"token:514bbdee004e","owner_claimed":false,"created_at":"2026-10-26T10:16:12.171995Z","updated_at":"2026-10-26T10:16:12.171995Z","last_confirmed_at":null,"ledger":{"first_seq":1,"last_seq":1,"head_hash":"95b00968df0faee47786a80f533c5d5d511ca784d8fbf66691fd683f7ff5cd76"}}