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Fix formdata issue #50

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Merged
owjs3901 merged 1 commit into from
Feb 18, 2026
+66 −20
Merged

Fix formdata issue #50

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1 change: 1 addition & 0 deletions .changepacks/changepack_log_KSLv5lwwQVCRgMsInMFuh.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
{"changes":{"packages/generator/package.json":"Patch"},"note":"Fix Formdata issue","date":"2026-02-18T18:18:07.532985400Z"}
4 changes: 4 additions & 0 deletions examples/next/app/page.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -97,6 +97,10 @@ export default function Home() {
tags: 'tag1,tag2',
},
})

api3.POST('/typed-form', {
body: new FormData(),
})
}, [mutateAsync])
return (
<Box>
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40 changes: 20 additions & 20 deletions packages/generator/src/__tests__/__snapshots__/generate-interface.test.ts.snap
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Expand Up @@ -1834,13 +1834,13 @@ declare module "@devup-api/fetch" {
interface DevupPostApiStruct {
'openapi.json': {
'/form': {
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'];
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'] | FormData;
response?: {
ok?: boolean;
};
};
subscribe: {
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'];
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'] | FormData;
response?: {
ok?: boolean;
};
Expand Down Expand Up @@ -1875,19 +1875,19 @@ declare module "@devup-api/fetch" {
interface DevupPostApiStruct {
'openapi.json': {
'/form/contact': {
body?: {
name?: string;
email?: string;
message?: string;
};
body: {
name?: string;
email?: string;
message?: string;
} | FormData;
response?: {};
};
contact: {
body?: {
name?: string;
email?: string;
message?: string;
};
body: {
name?: string;
email?: string;
message?: string;
} | FormData;
response?: {};
};
}
Expand All @@ -1913,13 +1913,13 @@ declare module "@devup-api/fetch" {
interface DevupPostApiStruct {
'openapi.json': {
'/typed-form': {
body: DevupObject<'request', 'openapi.json'>['CreateFileUploadRequest'];
body: DevupObject<'request', 'openapi.json'>['CreateFileUploadRequest'] | FormData;
response?: {
id?: string;
};
};
createFileUpload: {
body: DevupObject<'request', 'openapi.json'>['CreateFileUploadRequest'];
body: DevupObject<'request', 'openapi.json'>['CreateFileUploadRequest'] | FormData;
response?: {
id?: string;
};
Expand Down Expand Up @@ -1993,14 +1993,14 @@ declare module "@devup-api/fetch" {
params: {
id: string;
};
body: DevupObject<'request', 'openapi.json'>['UpdateFileUploadRequest'];
body: DevupObject<'request', 'openapi.json'>['UpdateFileUploadRequest'] | FormData;
response?: {};
};
updateFileUpload: {
params: {
id: string;
};
body: DevupObject<'request', 'openapi.json'>['UpdateFileUploadRequest'];
body: DevupObject<'request', 'openapi.json'>['UpdateFileUploadRequest'] | FormData;
response?: {};
};
}
Expand All @@ -2012,14 +2012,14 @@ declare module "@devup-api/fetch" {
params: {
id: string;
};
body: DevupObject<'request', 'openapi.json'>['PatchFileUploadRequest'];
body: DevupObject<'request', 'openapi.json'>['PatchFileUploadRequest'] | FormData;
response?: {};
};
patchFileUpload: {
params: {
id: string;
};
body: DevupObject<'request', 'openapi.json'>['PatchFileUploadRequest'];
body: DevupObject<'request', 'openapi.json'>['PatchFileUploadRequest'] | FormData;
response?: {};
};
}
Expand Down Expand Up @@ -2064,11 +2064,11 @@ declare module "@devup-api/fetch" {
response?: {};
};
'/form': {
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'];
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'] | FormData;
response?: {};
};
subscribe: {
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'];
body: DevupObject<'request', 'openapi.json'>['SubscribeRequest'] | FormData;
response?: {};
};
'/form/upload': {
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41 changes: 41 additions & 0 deletions packages/generator/src/generate-interface.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ import {
getRequestBodyContent,
isErrorStatusCode,
normalizeServerName,
resolveRef,
} from './openapi-utils'
import { wrapInterfaceKeyGuard } from './wrap-interface-key-guard'

Expand Down Expand Up @@ -117,6 +118,30 @@ function extractContentType(
return extractInlineType(jsonContent.schema)
}

/**
* Check if a request body uses form or multipart content type.
*/
function isFormOrMultipartRequestBody(
requestBody: OpenAPIV3_1.RequestBodyObject | OpenAPIV3_1.ReferenceObject,
document: OpenAPIV3_1.Document,
): boolean {
let content: OpenAPIV3_1.RequestBodyObject['content'] | undefined
if ('$ref' in requestBody) {
const resolved = resolveRef<OpenAPIV3_1.RequestBodyObject>(
requestBody.$ref,
document,
)
content = resolved?.content
} else {
content = requestBody.content
}
if (!content) return false
return (
content['multipart/form-data'] !== undefined ||
content['application/x-www-form-urlencoded'] !== undefined
)
}

// Generate interface for a single schema
function generateSchemaInterface(
schema: OpenAPIV3_1.Document,
Expand Down Expand Up @@ -346,6 +371,22 @@ function generateSchemaInterface(
}
}
if (requestBodyType !== undefined) {
// For form/multipart endpoints, also allow FormData as body type
if (operation.requestBody) {
const isFormMultipart = isFormOrMultipartRequestBody(
operation.requestBody,
schema,
)
if (isFormMultipart) {
const bodyStr =
typeof requestBodyType === 'string'
? requestBodyType
: formatTypeValue(requestBodyType)
if (!bodyStr.includes('FormData')) {
requestBodyType = `${bodyStr} | FormData`
}
}
}
endpoint.body = requestBodyType
}

Expand Down