compatibleAPI.js
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"use strict";
/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */
/** @typedef {import("../index.js").ServerResponse} ServerResponse */
/**
* @typedef {Object} ExpectedRequest
* @property {(name: string) => string | undefined} get
*/
/**
* @typedef {Object} ExpectedResponse
* @property {(name: string) => string | string[] | undefined} get
* @property {(name: string, value: number | string | string[]) => void} set
* @property {(status: number) => void} status
* @property {(data: any) => void} send
*/
/**
* @template {ServerResponse} Response
* @param {Response} res
* @returns {string[]}
*/
function getHeaderNames(res) {
if (typeof res.getHeaderNames !== "function") {
// @ts-ignore
// eslint-disable-next-line no-underscore-dangle
return Object.keys(res._headers || {});
}
return res.getHeaderNames();
}
/**
* @template {IncomingMessage} Request
* @param {Request} req
* @param {string} name
* @returns {string | undefined}
*/
function getHeaderFromRequest(req, name) {
// Express API
if (typeof
/** @type {Request & ExpectedRequest} */
req.get === "function") {
return (
/** @type {Request & ExpectedRequest} */
req.get(name)
);
} // Node.js API
// @ts-ignore
return req.headers[name];
}
/**
* @template {ServerResponse} Response
* @param {Response} res
* @param {string} name
* @returns {number | string | string[] | undefined}
*/
function getHeaderFromResponse(res, name) {
// Express API
if (typeof
/** @type {Response & ExpectedResponse} */
res.get === "function") {
return (
/** @type {Response & ExpectedResponse} */
res.get(name)
);
} // Node.js API
return res.getHeader(name);
}
/**
* @template {ServerResponse} Response
* @param {Response} res
* @param {string} name
* @param {number | string | string[]} value
* @returns {void}
*/
function setHeaderForResponse(res, name, value) {
// Express API
if (typeof
/** @type {Response & ExpectedResponse} */
res.set === "function") {
/** @type {Response & ExpectedResponse} */
res.set(name, typeof value === "number" ? String(value) : value);
return;
} // Node.js API
res.setHeader(name, value);
}
/**
* @template {ServerResponse} Response
* @param {Response} res
* @param {number} code
*/
function setStatusCode(res, code) {
if (typeof
/** @type {Response & ExpectedResponse} */
res.status === "function") {
/** @type {Response & ExpectedResponse} */
res.status(code);
return;
} // eslint-disable-next-line no-param-reassign
res.statusCode = code;
}
/**
* @template {IncomingMessage} Request
* @template {ServerResponse} Response
* @param {Request} req
* @param {Response} res
* @param {string | Buffer | import("fs").ReadStream} bufferOtStream
* @param {number} byteLength
*/
function send(req, res, bufferOtStream, byteLength) {
if (typeof
/** @type {import("fs").ReadStream} */
bufferOtStream.pipe === "function") {
setHeaderForResponse(res, "Content-Length", byteLength);
if (req.method === "HEAD") {
res.end();
return;
}
/** @type {import("fs").ReadStream} */
bufferOtStream.pipe(res);
return;
}
if (typeof
/** @type {Response & ExpectedResponse} */
res.send === "function") {
/** @type {Response & ExpectedResponse} */
res.send(bufferOtStream);
return;
} // Only Node.js API used
res.setHeader("Content-Length", byteLength);
if (req.method === "HEAD") {
res.end();
} else {
res.end(bufferOtStream);
}
}
module.exports = {
getHeaderNames,
getHeaderFromRequest,
getHeaderFromResponse,
setHeaderForResponse,
setStatusCode,
send
};