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

PR Close #21053

packages/compiler/test/ml_parser/ast_serializer_spec.ts

@@ -10,7 +10,7 @@ import * as html from '@angular/compiler/src/ml_parser/ast';
 import {HtmlParser} from '@angular/compiler/src/ml_parser/html_parser';
 import {getHtmlTagDefinition} from '@angular/compiler/src/ml_parser/html_tags';
 
-export function main() {
+{
   describe('Node serializer', () => {
     let parser: HtmlParser;
 

packages/compiler/test/ml_parser/html_parser_spec.ts

@@ -13,7 +13,7 @@ import {ParseError} from '../../src/parse_util';
 
 import {humanizeDom, humanizeDomSourceSpans, humanizeLineColumn} from './ast_spec_utils';
 
-export function main() {
+{
   describe('HtmlParser', () => {
     let parser: HtmlParser;
 

packages/compiler/test/ml_parser/html_whitespaces_spec.ts

@@ -12,7 +12,7 @@ import {PRESERVE_WS_ATTR_NAME, removeWhitespaces} from '../../src/ml_parser/html
 
 import {humanizeDom} from './ast_spec_utils';
 
-export function main() {
+{
   describe('removeWhitespaces', () => {
 
     function parseAndRemoveWS(template: string): any[] {

packages/compiler/test/ml_parser/icu_ast_expander_spec.ts

@@ -13,7 +13,7 @@ import {ParseError} from '../../src/parse_util';
 
 import {humanizeNodes} from './ast_spec_utils';
 
-export function main() {
+{
   describe('Expander', () => {
     function expand(template: string): ExpansionResult {
       const htmlParser = new HtmlParser();

packages/compiler/test/ml_parser/lexer_spec.ts

@@ -11,7 +11,7 @@ import {InterpolationConfig} from '../../src/ml_parser/interpolation_config';
 import * as lex from '../../src/ml_parser/lexer';
 import {ParseLocation, ParseSourceFile, ParseSourceSpan} from '../../src/parse_util';
 
-export function main() {
+{
   describe('HtmlLexer', () => {
     describe('line/column numbers', () => {
       it('should work without newlines', () => {