Always use strict equality. (#1225)

lib/application.js

@@ -197,7 +197,7 @@ module.exports = class Application extends Emitter {
   onerror(err) {
     if (!(err instanceof Error)) throw new TypeError(util.format('non-error thrown: %j', err));
 
-    if (404 == err.status || err.expose) return;
+    if (404 === err.status || err.expose) return;
     if (this.silent) return;
 
     const msg = err.stack || err.toString();
@@ -257,7 +257,7 @@ function respond(ctx) {
 
   // responses
   if (Buffer.isBuffer(body)) return res.end(body);
-  if ('string' == typeof body) return res.end(body);
+  if ('string' === typeof body) return res.end(body);
   if (body instanceof Stream) return body.pipe(res);
 
   // body: json

lib/context.js

@@ -144,10 +144,10 @@ const proto = module.exports = {
     this.type = 'text';
 
     // ENOENT support
-    if ('ENOENT' == err.code) err.status = 404;
+    if ('ENOENT' === err.code) err.status = 404;
 
     // default to 500
-    if ('number' != typeof err.status || !statuses[err.status]) err.status = 500;
+    if ('number' !== typeof err.status || !statuses[err.status]) err.status = 500;
 
     // respond
     const code = statuses[err.status];

lib/request.js

@@ -272,7 +272,7 @@ module.exports = {
   get hostname() {
     const host = this.host;
     if (!host) return '';
-    if ('[' == host[0]) return this.URL.hostname || ''; // IPv6
+    if ('[' === host[0]) return this.URL.hostname || ''; // IPv6
     return host.split(':', 1)[0];
   },
 
@@ -311,10 +311,10 @@ module.exports = {
     const s = this.ctx.status;
 
     // GET or HEAD for weak freshness validation only
-    if ('GET' != method && 'HEAD' != method) return false;
+    if ('GET' !== method && 'HEAD' !== method) return false;
 
     // 2xx or 304 as per rfc2616 14.26
-    if ((s >= 200 && s < 300) || 304 == s) {
+    if ((s >= 200 && s < 300) || 304 === s) {
       return fresh(this.header, this.response.header);
     }
 
@@ -382,7 +382,7 @@ module.exports = {
 
   get length() {
     const len = this.get('Content-Length');
-    if (len == '') return;
+    if (len === '') return;
     return ~~len;
   },
 
@@ -415,7 +415,7 @@ module.exports = {
    */
 
   get secure() {
-    return 'https' == this.protocol;
+    return 'https' === this.protocol;
   },
 
   /**

lib/response.js

@@ -153,7 +153,7 @@ module.exports = {
     const setType = !this.has('Content-Type');
 
     // string
-    if ('string' == typeof val) {
+    if ('string' === typeof val) {
       if (setType) this.type = /^\s*</.test(val) ? 'html' : 'text';
       this.length = Buffer.byteLength(val);
       return;
@@ -167,12 +167,12 @@ module.exports = {
     }
 
     // stream
-    if ('function' == typeof val.pipe) {
+    if ('function' === typeof val.pipe) {
       onFinish(this.res, destroy.bind(null, val));
       ensureErrorHandler(val, err => this.ctx.onerror(err));
 
       // overwriting
-      if (null != original && original != val) this.remove('Content-Length');
+      if (null != original && original !== val) this.remove('Content-Length');
 
       if (setType) this.type = 'bin';
       return;
@@ -258,7 +258,7 @@ module.exports = {
 
   redirect(url, alt) {
     // location
-    if ('back' == url) url = this.ctx.get('Referrer') || alt || '/';
+    if ('back' === url) url = this.ctx.get('Referrer') || alt || '/';
     this.set('Location', encodeUrl(url));
 
     // status
@@ -325,7 +325,7 @@ module.exports = {
    */
 
   set lastModified(val) {
-    if ('string' == typeof val) val = new Date(val);
+    if ('string' === typeof val) val = new Date(val);
     this.set('Last-Modified', val.toUTCString());
   },
 
@@ -458,7 +458,7 @@ module.exports = {
   set(field, val) {
     if (this.headerSent) return;
 
-    if (2 == arguments.length) {
+    if (2 === arguments.length) {
       if (Array.isArray(val)) val = val.map(v => typeof v === 'string' ? v : String(v));
       else if (typeof val !== 'string') val = String(val);
       this.res.setHeader(field, val);