Where do I get a type bundle for my chain?
Most chains publish their type bundles as an npm package (for example: Edgeware). One of the best places to check for the latest version is the polkadot-js/app and polkadot-js/api repositories. It's worth noting, however, that a types bundle is only needed for pre-Metadata v14 blocks, so for recently deployed chains it may be not needed.
Note: the type bundle format for typegen is slightly different from
OverrideBundleDefinition of polkadot.js. The structure is as follows, all the fields are optional.1
{
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types: {}, // top-level type definitions, as `.types` option of `ApiPromise`
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typesAlias: {}, // top-level type alieases, as `.typesAlias` option of `ApiPromise`
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versions: [ // spec version specific overrides, same as `OverrideBundleDefinition.types` of `polkadot.js`
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{
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minmax: [0, 1010] // spec range
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types: {}, // type overrides for the spec range
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typesAlias: {}, // type alias overrides for the spec range
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}
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]
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}
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