64 lines
1.5 KiB
TypeScript
64 lines
1.5 KiB
TypeScript
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export interface FetchRequestContext {
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url: string
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init: RequestInit
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}
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export interface FetchRequestInterceptor {
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onRequest?(
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context: FetchRequestContext,
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): Promise<FetchRequestContext> | FetchRequestContext
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onResponse?(
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context: FetchRequestContext,
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response: Response,
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): Promise<Response> | Response
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onError?(context: FetchRequestContext, error: unknown): Promise<void> | void
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}
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function mergeHeaders(
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currentHeaders: HeadersInit | undefined,
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newHeaders: HeadersInit,
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): Headers {
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const mergedHeaders = new Headers(currentHeaders)
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const incomingHeaders = new Headers(newHeaders)
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incomingHeaders.forEach((value, key) => {
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mergedHeaders.set(key, value)
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})
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return mergedHeaders
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}
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export function createHeaderRequestInterceptor(
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headers: HeadersInit,
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): FetchRequestInterceptor {
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return {
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onRequest(context) {
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return {
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...context,
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init: {
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...context.init,
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headers: mergeHeaders(context.init.headers, headers),
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},
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}
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},
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}
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}
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export function createEnsureSuccessResponseInterceptor(): FetchRequestInterceptor {
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return {
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async onResponse(_, response) {
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if (response.ok) {
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return response
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}
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const errorBody = await response.text().catch(() => '')
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const normalizedBody = errorBody
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return Promise.reject({
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status: response.status,
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statusText: response.statusText,
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body: normalizedBody,
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})
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},
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}
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}
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