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chore: improve readability of query/param/header types #169

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Jul 19, 2022
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chore: improve readability of query/param/header types #169

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20 changes: 8 additions & 12 deletions packages/io-ts-http/src/httpRequest.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,21 +37,17 @@ type EmitOutputTypeErrors<
: {
[K in keyof P & string]: P[K] extends t.Type<any, O, any>
? P[K]
: `Codec's output type is not assignable to ${OName}. Try using one like \`NumberFromString\``;
: `Codec's output type is not assignable to \`${OName}\`. Try using one like \`NumberFromString\``;
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This suggestion seems like a blind guess 😅

I don't suppose there's any way to test these changes?

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Yeah didn't really want to get into some long conditional chain of P[K] extends t.NumberC ? 'NumberFromString' : ... many other codecs

As for testing I briefly thought of that and it's definitely not as easy as a "check that an expression typechecks" test, since we don't want to break compilation.

};

type QueryValue = string | string[] | undefined;
type ParamValue = string | undefined;
type HeaderValue = string | undefined;

type EmitPropsErrors<P extends HttpRequestCombinatorProps> = {
params?: EmitOutputTypeErrors<P['params'], string | undefined, 'string | undefined'>;
query?: EmitOutputTypeErrors<
P['query'],
string | string[] | undefined,
'string | string[] | undefined'
>;
headers?: EmitOutputTypeErrors<
P['headers'],
string | undefined,
'string | undefined'
>;
params?: EmitOutputTypeErrors<P['params'], ParamValue, 'string | undefined'>;
query?: EmitOutputTypeErrors<P['query'], QueryValue, 'string | string[] | undefined'>;
headers?: EmitOutputTypeErrors<P['headers'], HeaderValue, 'string | undefined'>;
};

export function httpRequest<
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