fix(tl-utils): optimize readers code size by merging pre-return vars

packages/tl-utils/src/codegen/reader.ts

@@ -5,13 +5,16 @@ import { snakeToCamel } from './utils'
 /**
  * Returns code as an object entry
  */
-export function generateReaderCodeForTlEntry(entry: TlEntry, includeFlags = false): string {
+export function generateReaderCodeForTlEntry(
+    entry: TlEntry,
+    includeFlags = false
+): string {
     if (entry.id === 0) entry.id = computeConstructorIdFromEntry(entry)
 
-    let ret = `${entry.id}:function(r){`
+    const pre = `${entry.id}:function(r){`
 
     if (!entry.arguments.length) {
-        return ret + `return{_:'${entry.name}'}},`
+        return pre + `return{_:'${entry.name}'}},`
     }
 
     let beforeReturn = ''
@@ -105,7 +108,6 @@ export function generateReaderCodeForTlEntry(entry: TlEntry, includeFlags = fals
             code += ':void 0'
         }
 
-
         if (isBeforeLastFlag) {
             beforeReturn += code + ';'
         } else {
@@ -113,7 +115,7 @@ export function generateReaderCodeForTlEntry(entry: TlEntry, includeFlags = fals
         }
     })
 
-    return `${ret}${beforeReturn}return{${returnCode}}},`
+    return `${pre}${beforeReturn.replace(/;var /g, ',')}return{${returnCode}}},`
 }
 
 export function generateReaderCodeForTlEntries(

packages/tl-utils/tests/codegen/reader.spec.ts

@@ -75,10 +75,10 @@ describe('generateReaderCodeForTlEntry', () => {
     it('generates code for constructors with multiple flags fields', () => {
         test(
             'updates.channelDifferenceEmpty#3e11affb flags:# final:flags.0?true pts:int timeout:flags.1?int flags2:# can_delete_channel:flags2.0?true = updates.ChannelDifference;',
-            'var flags=r.uint();',
-            'var pts=r.int();',
-            'var timeout=flags&2?r.int():void 0;',
-            'var flags2=r.uint();',
+            'var flags=r.uint(),',
+            'pts=r.int(),',
+            'timeout=flags&2?r.int():void 0,',
+            'flags2=r.uint();',
             'return{',
             "_:'updates.channelDifferenceEmpty',",
             'final:!!(flags&1),',
@@ -128,8 +128,8 @@ describe('generateReaderCodeForTlEntry', () => {
         const entry = parseTlToEntries('test flags:# flags2:# = Test;')[0]
         expect(generateReaderCodeForTlEntry(entry, true)).eq(
             `${entry.id}:function(r){${[
-                'var flags=r.uint();',
-                'var flags2=r.uint();',
+                'var flags=r.uint(),',
+                'flags2=r.uint();',
                 'return{',
                 "_:'test',",
                 'flags:flags,',