crypto: make LazyTransform compabile with Streams1

Makes LazyTransform writable by Streams1 by assigning .writable = true before the actual classes are loaded. Fixes: #12269 PR-URL: #12380 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

Author: mcollina

lib/internal/streams/lazy_transform.js

@@ -10,6 +10,8 @@ module.exports = LazyTransform;
 
 functionLazyTransform(options){
 this._options=options;
+this.writable=true;
+this.readable=true;
 }
 util.inherits(LazyTransform,stream.Transform);
 

test/parallel/test-crypto-lazy-transform-writable.js

@@ -0,0 +1,34 @@
+'use strict';
+
+constcommon=require('../common');
+constassert=require('assert');
+constcrypto=require('crypto');
+constStream=require('stream');
+constutil=require('util');
+
+consthasher1=crypto.createHash('sha256');
+consthasher2=crypto.createHash('sha256');
+
+// Calculate the expected result.
+hasher1.write(Buffer.from('hello world'));
+hasher1.end();
+
+constexpected=hasher1.read().toString('hex');
+
+functionOldStream(){
+Stream.call(this);
+
+this.readable=true;
+}
+util.inherits(OldStream,Stream);
+
+conststream=newOldStream();
+
+stream.pipe(hasher2).on('finish',common.mustCall(function(){
+consthash=hasher2.read().toString('hex');
+assert.strictEqual(expected,hash);
+}));
+
+stream.emit('data',Buffer.from('hello'));
+stream.emit('data',Buffer.from(' world'));
+stream.emit('end');