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fix: derive compact codec for single-field structs #314

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Oct 22, 2022
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fix: derive compact codec for single-field structs #314

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17 changes: 15 additions & 2 deletions frame_metadata/Codec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -88,7 +88,7 @@ export function DeriveCodec(tys: M.Ty[]): DeriveCodec {
},
compact(ty) {
const inner = this.visit(ty.typeParam);
return compactCodecVisitor.visit(inner);
return $compact(inner);
},
bitSequence() {
return $.bitSequence;
Expand Down Expand Up @@ -126,4 +126,17 @@ const compactCodecVisitor = new $.CodecVisitor<$.Codec<any>>()
.add($.u32, () => $.compactU32)
.add($.u64, () => $.compactU64)
.add($.u128, () => $.compactU128)
.add($.u256, () => $.compactU256);
.add($.u256, () => $.compactU256)
.add(
$.object,
(_, ...fields) => {
if (fields.length !== 1) {
// https://github.com/paritytech/parity-scale-codec/blob/75fab93/derive/src/lib.rs#L307
throw new Error("Cannot derive Compact codec for structs with more than one key");
}
const field = fields[0]!;
return $.object([field[0], $compact(field[1] as $.Codec<any>)]);
},
);

const $compact = <T>(x: $.Codec<T>): $.Codec<T> => compactCodecVisitor.visit(x);