build: remove main() from specs (#21053)

PR Close #21053

packages/compiler/test/css_parser/css_lexer_spec.ts

@@ -9,7 +9,7 @@
 import {describe, expect, it} from '../../../core/testing/src/testing_internal';
 import {CssLexer, CssLexerMode, CssToken, CssTokenType, cssScannerError, getRawMessage, getToken} from '../../src/css_parser/css_lexer';
 
-export function main() {
+(function(){
   function tokenize(
       code: string, trackComments: boolean = false,
       mode: CssLexerMode = CssLexerMode.ALL): CssToken[] {
@@ -373,4 +373,4 @@ export function main() {
              });
         });
   });
-}
+})();

packages/compiler/test/css_parser/css_parser_spec.ts

@@ -18,7 +18,7 @@ export function assertTokens(tokens: CssToken[], valuesArr: string[]) {
   }
 }
 
-export function main() {
+{
   describe('CssParser', () => {
     function parse(css: string): ParsedCssResult {
       return new CssParser().parse(css, 'some-fake-css-file.css');

packages/compiler/test/css_parser/css_visitor_spec.ts

@@ -115,7 +115,7 @@ function _getCaptureAst(capture: any[], index = 0): CssAst {
   return <CssAst>capture[index][0];
 }
 
-export function main() {
+(function(){
   function parse(cssCode: string, ignoreErrors: boolean = false) {
     const output = new CssParser().parse(cssCode, 'some-fake-css-file.css');
     const errors = output.errors;
@@ -318,4 +318,4 @@ export function main() {
       _assertTokens(rule.tokens, ['six', 'seven', 'eight']);
     });
   });
-}
+})();