zlib: deprecate initializing without new qualifier

lib/zlib.js

@@ -706,57 +706,72 @@ Zlib.prototype.params = function params(level, strategy, callback) {
 // generic zlib
 // minimal 2-byte header
 function Deflate(opts) {
-  if (!(this instanceof Deflate))
+  if (!(this instanceof Deflate)) {
+    process.emitWarning(`Initializing Deflate without "new" qualifier is deprecated`, 'DEP0000');
     return new Deflate(opts);
+  }
   ReflectApply(Zlib, this, [opts, DEFLATE]);
 }
 ObjectSetPrototypeOf(Deflate.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(Deflate, Zlib);
 
 function Inflate(opts) {
-  if (!(this instanceof Inflate))
+  if (!(this instanceof Inflate)) {
+    process.emitWarning(`Initializing Inflate without "new" qualifier is deprecated`, 'DEP0000');
     return new Inflate(opts);
+  }
   ReflectApply(Zlib, this, [opts, INFLATE]);
 }
 ObjectSetPrototypeOf(Inflate.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(Inflate, Zlib);
 
 function Gzip(opts) {
-  if (!(this instanceof Gzip))
+  if (!(this instanceof Gzip)) {
+    process.emitWarning(`Initializing Inflate without "new" qualifier is deprecated`, 'DEP0000');
     return new Gzip(opts);
+  }
   ReflectApply(Zlib, this, [opts, GZIP]);
 }
 ObjectSetPrototypeOf(Gzip.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(Gzip, Zlib);
 
 function Gunzip(opts) {
-  if (!(this instanceof Gunzip))
+  if (!(this instanceof Gunzip)) {
+    process.emitWarning(`Initializing Gunzip without "new" qualifier is deprecated`, 'DEP0000');
     return new Gunzip(opts);
+  }
   ReflectApply(Zlib, this, [opts, GUNZIP]);
 }
 ObjectSetPrototypeOf(Gunzip.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(Gunzip, Zlib);
 
 function DeflateRaw(opts) {
   if (opts && opts.windowBits === 8) opts.windowBits = 9;
-  if (!(this instanceof DeflateRaw))
+  if (!(this instanceof DeflateRaw)) {
+    process.emitWarning(`Initializing DeflateRaw without "new" qualifier is deprecated`, 'DEP0000');
     return new DeflateRaw(opts);
+  }
   ReflectApply(Zlib, this, [opts, DEFLATERAW]);
 }
 ObjectSetPrototypeOf(DeflateRaw.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(DeflateRaw, Zlib);
 
 function InflateRaw(opts) {
-  if (!(this instanceof InflateRaw))
+  if (!(this instanceof InflateRaw)) {
+    process.emitWarning(`Initializing InflateRaw without "new" qualifier is deprecated`, 'DEP0000');
     return new InflateRaw(opts);
+  }
   ReflectApply(Zlib, this, [opts, INFLATERAW]);
 }
 ObjectSetPrototypeOf(InflateRaw.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(InflateRaw, Zlib);
 
 function Unzip(opts) {
-  if (!(this instanceof Unzip))
+  if (!(this instanceof Unzip)) {
+    process.emitWarning(`Initializing Unzip without "new" qualifier is deprecated`, 'DEP0000');
     return new Unzip(opts);
+
+  }
   ReflectApply(Zlib, this, [opts, UNZIP]);
 }
 ObjectSetPrototypeOf(Unzip.prototype, Zlib.prototype);
@@ -831,16 +846,21 @@ ObjectSetPrototypeOf(Brotli.prototype, Zlib.prototype);
 ObjectSetPrototypeOf(Brotli, Zlib);
 
 function BrotliCompress(opts) {
-  if (!(this instanceof BrotliCompress))
+  if (!(this instanceof BrotliCompress)) {
+    process.emitWarning(`Initializing BrotliCompress without "new" qualifier is deprecated`, 'DEP0000');
     return new BrotliCompress(opts);
+  }
   ReflectApply(Brotli, this, [opts, BROTLI_ENCODE]);
 }
 ObjectSetPrototypeOf(BrotliCompress.prototype, Brotli.prototype);
 ObjectSetPrototypeOf(BrotliCompress, Brotli);
 
 function BrotliDecompress(opts) {
-  if (!(this instanceof BrotliDecompress))
+  if (!(this instanceof BrotliDecompress)) {
+    process.emitWarning(`Initializing BrotliDecompress without "new" qualifier is deprecated`, 'DEP0000');
     return new BrotliDecompress(opts);
+
+  }
   ReflectApply(Brotli, this, [opts, BROTLI_DECODE]);
 }
 ObjectSetPrototypeOf(BrotliDecompress.prototype, Brotli.prototype);