How to use resContentTypeIs method in Cypress

...75    // don't inject if we didn't find both text/html and application/xhtml+xml,76    const accept = req.headers['accept'];77    return accept && accept.includes('text/html') && accept.includes('application/xhtml+xml');78}79function resContentTypeIs(res, contentType) {80    return (res.headers['content-type'] || '').includes(contentType);81}82function resContentTypeIsJavaScript(res) {83    return lodash_1.default.some(['application/javascript', 'application/x-javascript', 'text/javascript']84        .map(lodash_1.default.partial(resContentTypeIs, res)));85}86function isHtml(res) {87    return !resContentTypeIsJavaScript(res);88}89function resIsGzipped(res) {90    return (res.headers['content-encoding'] || '').includes('gzip');91}92function setCookie(res, k, v, domain) {93    let opts = { domain };94    if (!v) {95        v = '';96        opts.expires = new Date(0);97    }98    return res.cookie(k, v, opts);99}100function setInitialCookie(res, remoteState, value) {101    // dont modify any cookies if we're trying to clear the initial cookie and we're not injecting anything102    // dont set the cookies if we're not on the initial request103    if ((!value && !res.wantsInjection) || !res.isInitial) {104        return;105    }106    return setCookie(res, '__cypress.initial', value, remoteState.domainName);107}108// "autoplay *; document-domain 'none'" => { autoplay: "*", "document-domain": "'none'" }109const parseFeaturePolicy = (policy) => {110    const pairs = policy.split('; ').map((directive) => directive.split(' '));111    return lodash_1.default.fromPairs(pairs);112};113// { autoplay: "*", "document-domain": "'none'" } => "autoplay *; document-domain 'none'"114const stringifyFeaturePolicy = (policy) => {115    const pairs = lodash_1.default.toPairs(policy);116    return pairs.map((directive) => directive.join(' ')).join('; ');117};118const LogResponse = function () {119    debug('received response %o', {120        req: lodash_1.default.pick(this.req, 'method', 'proxiedUrl', 'headers'),121        incomingRes: lodash_1.default.pick(this.incomingRes, 'headers', 'statusCode'),122    });123    this.next();124};125const AttachPlainTextStreamFn = function () {126    this.makeResStreamPlainText = function () {127        debug('ensuring resStream is plaintext');128        if (!this.isGunzipped && resIsGzipped(this.incomingRes)) {129            debug('gunzipping response body');130            const gunzip = zlib_1.default.createGunzip(zlibOptions);131            this.incomingResStream = this.incomingResStream.pipe(gunzip).on('error', this.onError);132            this.isGunzipped = true;133        }134    };135    this.next();136};137const PatchExpressSetHeader = function () {138    const { incomingRes } = this;139    const originalSetHeader = this.res.setHeader;140    // Node uses their own Symbol object, so use this to get the internal kOutHeaders141    // symbol - Symbol.for('kOutHeaders') will not work142    const getKOutHeadersSymbol = () => {143        const findKOutHeadersSymbol = () => {144            return lodash_1.default.find(Object.getOwnPropertySymbols(this.res), (sym) => {145                return sym.toString() === 'Symbol(kOutHeaders)';146            });147        };148        let sym = findKOutHeadersSymbol();149        if (sym) {150            return sym;151        }152        // force creation of a new header field so the kOutHeaders key is available153        this.res.setHeader('X-Cypress-HTTP-Response', 'X');154        this.res.removeHeader('X-Cypress-HTTP-Response');155        sym = findKOutHeadersSymbol();156        if (!sym) {157            throw new Error('unable to find kOutHeaders symbol');158        }159        return sym;160    };161    let kOutHeaders;162    this.res.setHeader = function (name, value) {163        // express.Response.setHeader does all kinds of silly/nasty stuff to the content-type...164        // but we don't want to change it at all!165        if (name === 'content-type') {166            value = incomingRes.headers['content-type'] || value;167        }168        // run the original function - if an "invalid header char" error is raised,169        // set the header manually. this way we can retain Node's original error behavior170        try {171            return originalSetHeader.call(this, name, value);172        }173        catch (err) {174            if (err.code !== 'ERR_INVALID_CHAR') {175                throw err;176            }177            debug('setHeader error ignored %o', { name, value, code: err.code, err });178            if (!kOutHeaders) {179                kOutHeaders = getKOutHeadersSymbol();180            }181            // https://github.com/nodejs/node/blob/42cce5a9d0fd905bf4ad7a2528c36572dfb8b5ad/lib/_http_outgoing.js#L483-L495182            let headers = this[kOutHeaders];183            if (!headers) {184                this[kOutHeaders] = headers = Object.create(null);185            }186            headers[name.toLowerCase()] = [name, value];187        }188    };189    this.next();190};191const SetInjectionLevel = function () {192    this.res.isInitial = this.req.cookies['__cypress.initial'] === 'true';193    const isRenderedHTML = reqWillRenderHtml(this.req);194    if (isRenderedHTML) {195        const origin = new URL(this.req.proxiedUrl).origin;196        this.getRenderedHTMLOrigins()[origin] = true;197    }198    const isReqMatchOriginPolicy = reqMatchesOriginPolicy(this.req, this.getRemoteState());199    const getInjectionLevel = () => {200        if (this.incomingRes.headers['x-cypress-file-server-error'] && !this.res.isInitial) {201            return 'partial';202        }203        if (!resContentTypeIs(this.incomingRes, 'text/html') || !isReqMatchOriginPolicy) {204            return false;205        }206        if (this.res.isInitial) {207            return 'full';208        }209        if (!isRenderedHTML) {210            return false;211        }212        return 'partial';213    };214    if (!this.res.wantsInjection) {215        this.res.wantsInjection = getInjectionLevel();216    }217    this.res.wantsSecurityRemoved = this.config.modifyObstructiveCode && isReqMatchOriginPolicy && ((this.res.wantsInjection === 'full')...

...174          var c, cookies, err, filePath, headers, i, len, newUrl, ref, statusCode;175          headers = incomingRes.headers, statusCode = incomingRes.statusCode;176          if (wantsInjection == null) {177            wantsInjection = (function() {178              if (!resContentTypeIs(headers, "text/html")) {179                return false;180              }181              if (!resMatchesOriginPolicy(headers)) {182                return false;183              }184              if (isInitial) {185                return "full";186              }187              if (!reqAcceptsHtml()) {188                return false;189              }190              return "partial";191            })();192          }193          if (wantsSecurityRemoved == null) {194            wantsSecurityRemoved = (function() {195              return resContentTypeIs(headers, "application/javascript");196            })();197          }198          _this.setResHeaders(req, res, incomingRes, wantsInjection);199          if (cookies = headers["set-cookie"]) {200            ref = [].concat(cookies);201            for (i = 0, len = ref.length; i < len; i++) {202              c = ref[i];203              try {204                res.append("Set-Cookie", c);205              } catch (error) {206                err = error;207              }208            }209          }...