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The following config snippet from the docs does not pass TSC (after renaming the config file to .ts and adding type annotations):

module.exports = {
  transform: {
    "^.+\\.(t|j)sx?$": ["@swc/jest"],
  },
};

TSC:

TSError: ⨯ Unable to compile TypeScript:
jest.config.ts:14:3 - error TS2322: Type '[string]' is not assignable to type 'string | TransformerConfig'.
  Type '[string]' is not assignable to type 'string'.

'^.+\\.(t|j)sx?$': [ '@swc/jest' ],

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I think it should be either @swc/jest as a plain string or [ '@swc/jest', {} ] with an empty record.