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feat: Add tsgo for faster dev type checking #83228

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dariusz-biela wants to merge 10 commits intoExpensify:mainfrom
software-mansion-labs:dariusz-biela/feat/tsgo-for-dev
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feat: Add tsgo for faster dev type checking #83228
dariusz-biela wants to merge 10 commits intoExpensify:mainfrom
software-mansion-labs:dariusz-biela/feat/tsgo-for-dev

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@dariusz-biela dariusz-biela commented Feb 23, 2026

Explanation of Change

Add @typescript/native-preview (tsgo) as a dev dependency with npm run typecheck-tsgo command for faster type checking during development. Includes a dedicated tsconfig.tsgo.json and fixes for existing type errors detected by tsgo.

Benchmark (Expensify App):

tsc tsgo Change
Full check 116.3s 15.7s -86%
Incremental (no changes) 9.2s 1.6s -83%
Memory usage 6,428MB 5,463MB -15%

Bugs fixed (detected by tsgo, silently accepted by tsc):

Remove duplicate VERIFY_3DS_SUBSCRIPTION key in OnyxValuesMapping
src/ONYXKEYS.ts:1321:5 - error TS2300: Duplicate identifier '[ONYXKEYS.VERIFY_3DS_SUBSCRIPTION]'.

1321     [ONYXKEYS.VERIFY_3DS_SUBSCRIPTION]: string;
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/ONYXKEYS.ts:1338:5 - error TS2300: Duplicate identifier '[ONYXKEYS.VERIFY_3DS_SUBSCRIPTION]'.

1338     [ONYXKEYS.VERIFY_3DS_SUBSCRIPTION]: string;
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Remove duplicate command keys in API/types.ts
src/libs/API/types.ts:704:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.UPDATE_WORKSPACE_DESCRIPTION]'.
src/libs/API/types.ts:790:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.UPDATE_WORKSPACE_DESCRIPTION]'.
src/libs/API/types.ts:825:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.SET_POLICY_RULES_ENABLED]'.
src/libs/API/types.ts:826:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.SET_POLICY_CODING_RULE]'.
src/libs/API/types.ts:864:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.SET_POLICY_RULES_ENABLED]'.
src/libs/API/types.ts:865:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.SET_POLICY_CODING_RULE]'.
src/libs/API/types.ts:943:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.SAVE_CORPAY_ONBOARDING_BENEFICIAL_OWNER]'.
src/libs/API/types.ts:950:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.SAVE_CORPAY_ONBOARDING_BENEFICIAL_OWNER]'.
src/libs/API/types.ts:1084:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.UPDATE_XERO_AUTO_SYNC]'.
src/libs/API/types.ts:1085:5 - error TS2300: Duplicate identifier '[WRITE_COMMANDS.UPDATE_XERO_AUTO_SYNC]'.
src/libs/API/types.ts:1304:5 - error TS2300: Duplicate identifier '[READ_COMMANDS.GET_SAML_SETTINGS]'.
src/libs/API/types.ts:1307:5 - error TS2300: Duplicate identifier '[READ_COMMANDS.GET_SAML_SETTINGS]'.
Add null check for regexResult.indices[0] in EmojiUtils
src/libs/EmojiUtils.tsx:694:37 - error TS2532: Object is possibly 'undefined'.

694             const matchIndexStart = regexResult.indices[0][0];
                                        ~~~~~~~~~~~~~~~~~~~~~~

src/libs/EmojiUtils.tsx:695:35 - error TS2532: Object is possibly 'undefined'.

695             const matchIndexEnd = regexResult.indices[0][1];
                                      ~~~~~~~~~~~~~~~~~~~~~~
Remove duplicate EXPENSIFY_CARD screen params in Navigation/types.ts
src/libs/Navigation/types.ts:2552:5 - error TS2300: Duplicate identifier '[SCREENS.WORKSPACE.EXPENSIFY_CARD]'.

2552     [SCREENS.WORKSPACE.EXPENSIFY_CARD]: {
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/libs/Navigation/types.ts:2688:5 - error TS2300: Duplicate identifier '[SCREENS.WORKSPACE.EXPENSIFY_CARD]'.

2688     [SCREENS.WORKSPACE.EXPENSIFY_CARD]: {
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Remove unnecessary @ts-expect-error directives and fix statusNum assignment in IOU/index.ts
src/libs/actions/IOU/index.ts:11171:17 - error TS2578: Unused '@ts-expect-error' directive.

11171                 // @ts-expect-error - will be solved in https://github.com/Expensify/App/issues/73830
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/libs/actions/IOU/index.ts:11175:17 - error TS2578: Unused '@ts-expect-error' directive.

11175                 // @ts-expect-error - will be solved in https://github.com/Expensify/App/issues/73830
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/libs/actions/IOU/index.ts:11179:21 - error TS2578: Unused '@ts-expect-error' directive.

11179                     // @ts-expect-error - will be solved in https://github.com/Expensify/App/issues/73830
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Restructure conditional OnyxUpdate spread to avoid undefined in Policy.ts
src/libs/actions/Policy/Policy.ts:481:9 - error TS2322: Type '{ onyxMethod: "set"; key: "bankAccountList"; value: BankAccountList; } | undefined' is not assignable to type 'OnyxUpdate<...>'.
  Type 'undefined' is not assignable to type 'OnyxUpdate<...>'.

481         ...(filteredBankAccountList !== bankAccountList
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
482             ? [
    ~~~~~~~~~~~~~~~
...
488               ]
    ~~~~~~~~~~~~~~~
489             : []),
    ~~~~~~~~~~~~~~~~~
Remove duplicate CORPAY field definitions in ReimbursementAccount.ts
src/types/onyx/ReimbursementAccount.ts:83:5 - error TS2300: Duplicate identifier '[INPUT_IDS.ADDITIONAL_DATA.CORPAY.OWNS_MORE_THAN_25_PERCENT]'.
src/types/onyx/ReimbursementAccount.ts:85:5 - error TS2300: Duplicate identifier '[INPUT_IDS.ADDITIONAL_DATA.CORPAY.ANY_INDIVIDUAL_OWN_25_PERCENT_OR_MORE]'.
src/types/onyx/ReimbursementAccount.ts:87:5 - error TS2300: Duplicate identifier '[INPUT_IDS.ADDITIONAL_DATA.CORPAY.BENEFICIAL_OWNERS]'.
src/types/onyx/ReimbursementAccount.ts:117:5 - error TS2300: Duplicate identifier '[INPUT_IDS.ADDITIONAL_DATA.CORPAY.OWNS_MORE_THAN_25_PERCENT]'.
src/types/onyx/ReimbursementAccount.ts:119:5 - error TS2300: Duplicate identifier '[INPUT_IDS.ADDITIONAL_DATA.CORPAY.ANY_INDIVIDUAL_OWN_25_PERCENT_OR_MORE]'.
src/types/onyx/ReimbursementAccount.ts:121:5 - error TS2300: Duplicate identifier '[INPUT_IDS.ADDITIONAL_DATA.CORPAY.BENEFICIAL_OWNERS]'.
Type lazy SVG import catch handlers in BackgroundImage/index.tsx
src/pages/signin/SignInPageLayout/BackgroundImage/index.tsx:10:5 - error TS2322: Type 'Promise<{ default: () => null; } | typeof import("*.svg")>' is not assignable to type 'Promise<{ default: () => null; }>'.
  Type '{ default: () => null; } | typeof import("*.svg")' is not assignable to type '{ default: () => null; }'.
    Type 'typeof import("*.svg")' is not assignable to type '{ default: () => null; }'.
      Types of property 'default' are incompatible.
        Type 'FC<SvgProps>' is not assignable to type '() => null'.

src/pages/signin/SignInPageLayout/BackgroundImage/index.tsx:15:5 - error TS2322: (same as above for desktop variant)

src/pages/signin/SignInPageLayout/BackgroundImage/index.tsx:58:38 - error TS2322: Type '{ width: number; }' is not assignable to type 'IntrinsicAttributes'.
  Property 'width' does not exist on type 'IntrinsicAttributes'.
Import ListRenderItemInfo from main @react-native/virtualized-lists export
src/components/MoneyRequestReportView/MoneyRequestReportActionsList.tsx:2:39 - error TS2307: Cannot find module '@react-native/virtualized-lists/Lists/VirtualizedList' or its corresponding type declarations.

2 import type {ListRenderItemInfo} from '@react-native/virtualized-lists/Lists/VirtualizedList';
                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/pages/inbox/report/ReportActionsList.tsx:1:39 - error TS2307: Cannot find module '@react-native/virtualized-lists/Lists/VirtualizedList' or its corresponding type declarations.

1 import type {ListRenderItemInfo} from '@react-native/virtualized-lists/Lists/VirtualizedList';
                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixed Issues

Tests

N/A — dev tooling only, no runtime changes.

Offline tests

N/A

QA Steps

N/A — no user-facing changes. [No QA]

PR Author Checklist

  • I linked the correct issue in the ### Fixed Issues section above
  • I wrote clear testing steps that cover the changes made in this PR
    • I added steps for local testing in the Tests section
    • I added steps for the expected offline behavior in the Offline steps section
    • I added steps for Staging and/or Production testing in the QA steps section
    • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
    • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
    • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
  • I included screenshots or videos for tests on all platforms
  • I ran the tests on all platforms & verified they passed on:
    • Android: Native
    • Android: mWeb Chrome
    • iOS: Native
    • iOS: mWeb Safari
    • MacOS: Chrome / Safari
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    • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
    • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
      • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
    • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
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  • If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
  • I followed the guidelines as stated in the Review Guidelines
  • I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
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  • If any new file was added I verified that:
    • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
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    • A similar style doesn't already exist
    • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
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  • If a new page is added, I verified it's using the ScrollView component to make it scrollable when more elements are added to the page.
  • I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
  • If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

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⚠️ This PR is possibly changing native code and/or updating libraries, it may cause problems with HybridApp. Please check if any patch updates are required in the HybridApp repo and run an AdHoc build to verify that HybridApp will not break. Ask Contributor Plus for help if you are not sure how to handle this. ⚠️

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