Upgrading from:

// package.json
"@polkadot/api": "^6.7.2",
"@polkadot/types": "^6.7.2",


// package.json
"@polkadot/api": "^7.7.1",
"@polkadot/types": "^7.7.1",

causes major compilation problems when using TypeScript on the front-end. There are a lot of missing types from the @polkadot/types/lookup folder (for example: Error: node_modules/@polkadot/api-derive/balances/types.d.ts:3:15 - error TS2305: Module '"@polkadot/types/lookup"' has no exported member 'PalletBalancesBalanceLock').

Is there a problem with the packages or is there some way to fix these errors? (Note, I'm currently only hitting the Substrate node template. I don't personally have any custom runtime logic in there).

1 Answer 1


As described in the CHANGELOG of the 7.x release, you must add the line:

import '@polkadot/api-augment';

and the types should work again.

  • Wow, that was such a simple fix. Thanks for pointing me to the release notes. I should've thought of that.
    – tarrball
    Commented Feb 15, 2022 at 16:11
  • If anybody comes wondering, the notes say to put this import "somewhere". For an Angular project, that somewhere was polyfills.ts.
    – tarrball
    Commented Feb 15, 2022 at 16:13
  • This is not working for me. I have a tiny, single-file PoC to just get account information and I'm getting a huge pile of typescript errors (840), even with the above import as the top line. Can anyone give me a push? This is with @polkadot/api version 9.2.4.
    – kael
    Commented Aug 31, 2022 at 16:13

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