type OpenApiSerializableLocation = "path" | "query" | "header" | "cookie"; export type OpenApiSerializableContent = {  mediaType: string;}; export type OpenApiSerializableParameter = {  name: string;  location: OpenApiSerializableLocation;  style?: string;  explode?: boolean;  allowReserved?: boolean;  content?: ReadonlyArray<OpenApiSerializableContent>;}; export type OpenApiSerializableRequestBody = {  contentTypes?: ReadonlyArray<string>;  contents?: ReadonlyArray<OpenApiSerializableContent>;}; export type SerializedOpenApiQueryEntry = {  name: string;  value: string;  allowReserved?: boolean;}; export type SerializedOpenApiParameterValue =  | {      kind: "path" | "header";      value: string;    }  | {      kind: "query";      entries: ReadonlyArray<SerializedOpenApiQueryEntry>;    }  | {      kind: "cookie";      pairs: ReadonlyArray<{        name: string;        value: string;      }>;    }; const isRecord = (value: unknown): value is Record<string, unknown> =>  value !== null && typeof value === "object" && !Array.isArray(value); const primitiveString = (value: unknown): string => {  if (typeof value === "string") {    return value;  }   if (    typeof value === "number"    || typeof value === "boolean"    || typeof value === "bigint"  ) {    return String(value);  }   if (value === null || value === undefined) {    return "";  }   try {    return JSON.stringify(value);  } catch {    return String(value);  }}; const objectEntries = (value: unknown): Array<[string, unknown]> =>  Object.entries(isRecord(value) ? value : {})    .sort(([left], [right]) => left.localeCompare(right)); const defaultStyle = (location: OpenApiSerializableLocation): string => {  switch (location) {    case "path":    case "header":      return "simple";    case "cookie":    case "query":      return "form";  }}; const defaultExplode = (location: OpenApiSerializableLocation, style: string): boolean =>  location === "query" || location === "cookie"    ? style === "form"    : false; const selectedStyle = (parameter: OpenApiSerializableParameter): string =>  parameter.style ?? defaultStyle(parameter.location); const selectedExplode = (parameter: OpenApiSerializableParameter): boolean =>  parameter.explode ?? defaultExplode(parameter.location, selectedStyle(parameter)); const encodePathPart = (value: unknown): string =>  encodeURIComponent(primitiveString(value)); const encodeQueryValue = (value: string, allowReserved: boolean): string => {  const encoded = encodeURIComponent(value);  if (!allowReserved) {    return encoded;  }   return encoded    .replace(/%3A/gi, ":")    .replace(/%2F/gi, "/")    .replace(/%3F/gi, "?")    .replace(/%23/gi, "#")    .replace(/%5B/gi, "[")    .replace(/%5D/gi, "]")    .replace(/%40/gi, "@")    .replace(/%21/gi, "!")    .replace(/%24/gi, "$")    .replace(/%26/gi, "&")    .replace(/%27/gi, "'")    .replace(/%28/gi, "(")    .replace(/%29/gi, ")")    .replace(/%2A/gi, "*")    .replace(/%2B/gi, "+")    .replace(/%2C/gi, ",")    .replace(/%3B/gi, ";")    .replace(/%3D/gi, "=");}; const preferredContentType = (input: {  contents?: ReadonlyArray<OpenApiSerializableContent>;  contentTypes?: ReadonlyArray<string>;}): string | undefined => {  const candidates = [    ...(input.contents ?? []).map((content) => content.mediaType),    ...(input.contentTypes ?? []),  ];  if (candidates.length === 0) {    return undefined;  }   return candidates.find((mediaType) => mediaType === "application/json")    ?? candidates.find((mediaType) => mediaType.toLowerCase().includes("+json"))    ?? candidates.find((mediaType) => mediaType.toLowerCase().includes("json"))    ?? candidates[0];}; const serializeContentValue = (value: unknown, mediaType: string): string => {  const normalized = mediaType.toLowerCase();  if (    normalized === "application/json"    || normalized.includes("+json")    || normalized.includes("json")  ) {    return JSON.stringify(value);  }   if (normalized === "application/x-www-form-urlencoded") {    const params = new URLSearchParams();    for (const [key, entryValue] of objectEntries(value)) {      if (Array.isArray(entryValue)) {        for (const item of entryValue) {          params.append(key, primitiveString(item));        }        continue;      }       params.append(key, primitiveString(entryValue));    }    return params.toString();  }   return primitiveString(value);}; const serializeQueryParameter = (  parameter: OpenApiSerializableParameter,  value: unknown,): SerializedOpenApiParameterValue => {  const style = selectedStyle(parameter);  const explode = selectedExplode(parameter);  const allowReserved = parameter.allowReserved === true;  const contentType = preferredContentType({ contents: parameter.content });   if (contentType) {    return {      kind: "query",      entries: [{        name: parameter.name,        value: serializeContentValue(value, contentType),        allowReserved,      }],    };  }   if (Array.isArray(value)) {    if (style === "spaceDelimited") {      return {        kind: "query",        entries: [{          name: parameter.name,          value: value.map((entry) => primitiveString(entry)).join(" "),          allowReserved,        }],      };    }     if (style === "pipeDelimited") {      return {        kind: "query",        entries: [{          name: parameter.name,          value: value.map((entry) => primitiveString(entry)).join("|"),          allowReserved,        }],      };    }     return {      kind: "query",      entries:        explode          ? value.map((entry) => ({              name: parameter.name,              value: primitiveString(entry),              allowReserved,            }))          : [{              name: parameter.name,              value: value.map((entry) => primitiveString(entry)).join(","),              allowReserved,            }],    };  }   if (isRecord(value)) {    const entries = objectEntries(value);     if (style === "deepObject") {      return {        kind: "query",        entries: entries.map(([key, entryValue]) => ({          name: `${parameter.name}[${key}]`,          value: primitiveString(entryValue),          allowReserved,        })),      };    }     return {      kind: "query",      entries:        explode          ? entries.map(([key, entryValue]) => ({              name: key,              value: primitiveString(entryValue),              allowReserved,            }))          : [{              name: parameter.name,              value: entries.flatMap(([key, entryValue]) => [key, primitiveString(entryValue)]).join(","),              allowReserved,            }],    };  }   return {    kind: "query",    entries: [{      name: parameter.name,      value: primitiveString(value),      allowReserved,    }],  };}; const serializeHeaderParameter = (  parameter: OpenApiSerializableParameter,  value: unknown,): SerializedOpenApiParameterValue => {  const explode = selectedExplode(parameter);  const contentType = preferredContentType({ contents: parameter.content });  if (contentType) {    return {      kind: "header",      value: serializeContentValue(value, contentType),    };  }   if (Array.isArray(value)) {    return {      kind: "header",      value: value.map((entry) => primitiveString(entry)).join(","),    };  }   if (isRecord(value)) {    const entries = objectEntries(value);    return {      kind: "header",      value:        explode          ? entries.map(([key, entryValue]) => `${key}=${primitiveString(entryValue)}`).join(",")          : entries.flatMap(([key, entryValue]) => [key, primitiveString(entryValue)]).join(","),    };  }   return {    kind: "header",    value: primitiveString(value),  };}; const serializeCookieParameter = (  parameter: OpenApiSerializableParameter,  value: unknown,): SerializedOpenApiParameterValue => {  const explode = selectedExplode(parameter);  const contentType = preferredContentType({ contents: parameter.content });  if (contentType) {    return {      kind: "cookie",      pairs: [{        name: parameter.name,        value: serializeContentValue(value, contentType),      }],    };  }   if (Array.isArray(value)) {    return {      kind: "cookie",      pairs:        explode          ? value.map((entry) => ({              name: parameter.name,              value: primitiveString(entry),            }))          : [{              name: parameter.name,              value: value.map((entry) => primitiveString(entry)).join(","),            }],    };  }   if (isRecord(value)) {    const entries = objectEntries(value);    return {      kind: "cookie",      pairs:        explode          ? entries.map(([key, entryValue]) => ({              name: key,              value: primitiveString(entryValue),            }))          : [{              name: parameter.name,              value: entries.flatMap(([key, entryValue]) => [key, primitiveString(entryValue)]).join(","),            }],    };  }   return {    kind: "cookie",    pairs: [{      name: parameter.name,      value: primitiveString(value),    }],  };}; const serializePathParameter = (  parameter: OpenApiSerializableParameter,  value: unknown,): SerializedOpenApiParameterValue => {  const style = selectedStyle(parameter);  const explode = selectedExplode(parameter);  const contentType = preferredContentType({ contents: parameter.content });  if (contentType) {    return {      kind: "path",      value: encodePathPart(serializeContentValue(value, contentType)),    };  }   if (Array.isArray(value)) {    if (style === "label") {      return {        kind: "path",        value: `.${value.map((entry) => encodePathPart(entry)).join(explode ? "." : ",")}`,      };    }     if (style === "matrix") {      return {        kind: "path",        value:          explode            ? value.map((entry) => `;${encodeURIComponent(parameter.name)}=${encodePathPart(entry)}`).join("")            : `;${encodeURIComponent(parameter.name)}=${value.map((entry) => encodePathPart(entry)).join(",")}`,      };    }     return {      kind: "path",      value: value.map((entry) => encodePathPart(entry)).join(","),    };  }   if (isRecord(value)) {    const entries = objectEntries(value);     if (style === "label") {      return {        kind: "path",        value:          explode            ? `.${entries.map(([key, entryValue]) => `${encodePathPart(key)}=${encodePathPart(entryValue)}`).join(".")}`            : `.${entries.flatMap(([key, entryValue]) => [encodePathPart(key), encodePathPart(entryValue)]).join(",")}`,      };    }     if (style === "matrix") {      return {        kind: "path",        value:          explode            ? entries.map(([key, entryValue]) => `;${encodeURIComponent(key)}=${encodePathPart(entryValue)}`).join("")            : `;${encodeURIComponent(parameter.name)}=${entries.flatMap(([key, entryValue]) => [                encodePathPart(key),                encodePathPart(entryValue),              ]).join(",")}`,      };    }     return {      kind: "path",      value:        explode          ? entries.map(([key, entryValue]) => `${encodePathPart(key)}=${encodePathPart(entryValue)}`).join(",")          : entries.flatMap(([key, entryValue]) => [encodePathPart(key), encodePathPart(entryValue)]).join(","),    };  }   if (style === "label") {    return {      kind: "path",      value: `.${encodePathPart(value)}`,    };  }   if (style === "matrix") {    return {      kind: "path",      value: `;${encodeURIComponent(parameter.name)}=${encodePathPart(value)}`,    };  }   return {    kind: "path",    value: encodePathPart(value),  };}; export const serializeOpenApiParameterValue = (  parameter: OpenApiSerializableParameter,  value: unknown,): SerializedOpenApiParameterValue => {  switch (parameter.location) {    case "path":      return serializePathParameter(parameter, value);    case "query":      return serializeQueryParameter(parameter, value);    case "header":      return serializeHeaderParameter(parameter, value);    case "cookie":      return serializeCookieParameter(parameter, value);  }}; export const withSerializedQueryEntries = (  url: URL,  entries: ReadonlyArray<SerializedOpenApiQueryEntry>,): string => {  if (entries.length === 0) {    return url.toString();  }   const suffix = entries    .map((entry) =>      `${encodeURIComponent(entry.name)}=${encodeQueryValue(entry.value, entry.allowReserved === true)}`    )    .join("&");   const urlText = url.toString();  const [withoutHash, hashFragment] = urlText.split("#", 2);  const separator =    withoutHash.includes("?")      ? (withoutHash.endsWith("?") || withoutHash.endsWith("&") ? "" : "&")      : "?";   return `${withoutHash}${separator}${suffix}${hashFragment ? `#${hashFragment}` : ""}`;};

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