fix(core): size regression with closure compiler (#25531)

By pulling in `compiler` into `core` the `compiler` was not
100% tree-shakable and about  8KB of code was retained
when tree-shaken with closure.

PR Close #25531

packages/compiler/src/ml_parser/html_tags.ts

@@ -69,9 +69,16 @@ export class HtmlTagDefinition implements TagDefinition {
   }
 }
 
+let _DEFAULT_TAG_DEFINITION !: HtmlTagDefinition;
+
 // see http://www.w3.org/TR/html51/syntax.html#optional-tags
 // This implementation does not fully conform to the HTML5 spec.
-const TAG_DEFINITIONS: {[key: string]: HtmlTagDefinition} = {
+let TAG_DEFINITIONS !: {[key: string]: HtmlTagDefinition};
+
+export function getHtmlTagDefinition(tagName: string): HtmlTagDefinition {
+  if (!TAG_DEFINITIONS) {
+    _DEFAULT_TAG_DEFINITION = new HtmlTagDefinition();
+    TAG_DEFINITIONS = {
       'base': new HtmlTagDefinition({isVoid: true}),
       'meta': new HtmlTagDefinition({isVoid: true}),
       'area': new HtmlTagDefinition({isVoid: true}),
@@ -87,9 +94,10 @@ const TAG_DEFINITIONS: {[key: string]: HtmlTagDefinition} = {
       'wbr': new HtmlTagDefinition({isVoid: true}),
       'p': new HtmlTagDefinition({
         closedByChildren: [
-      'address', 'article', 'aside', 'blockquote', 'div', 'dl',      'fieldset', 'footer', 'form',
-      'h1',      'h2',      'h3',    'h4',         'h5',  'h6',      'header',   'hgroup', 'hr',
-      'main',    'nav',     'ol',    'p',          'pre', 'section', 'table',    'ul'
+          'address', 'article', 'aside',   'blockquote', 'div',  'dl',  'fieldset',
+          'footer',  'form',    'h1',      'h2',         'h3',   'h4',  'h5',
+          'h6',      'header',  'hgroup',  'hr',         'main', 'nav', 'ol',
+          'p',       'pre',     'section', 'table',      'ul'
         ],
         closedByParent: true
       }),
@@ -109,23 +117,24 @@ const TAG_DEFINITIONS: {[key: string]: HtmlTagDefinition} = {
       'li': new HtmlTagDefinition({closedByChildren: ['li'], closedByParent: true}),
       'dt': new HtmlTagDefinition({closedByChildren: ['dt', 'dd']}),
       'dd': new HtmlTagDefinition({closedByChildren: ['dt', 'dd'], closedByParent: true}),
-  'rb': new HtmlTagDefinition({closedByChildren: ['rb', 'rt', 'rtc', 'rp'], closedByParent: true}),
-  'rt': new HtmlTagDefinition({closedByChildren: ['rb', 'rt', 'rtc', 'rp'], closedByParent: true}),
+      'rb': new HtmlTagDefinition(
+          {closedByChildren: ['rb', 'rt', 'rtc', 'rp'], closedByParent: true}),
+      'rt': new HtmlTagDefinition(
+          {closedByChildren: ['rb', 'rt', 'rtc', 'rp'], closedByParent: true}),
       'rtc': new HtmlTagDefinition({closedByChildren: ['rb', 'rtc', 'rp'], closedByParent: true}),
-  'rp': new HtmlTagDefinition({closedByChildren: ['rb', 'rt', 'rtc', 'rp'], closedByParent: true}),
+      'rp': new HtmlTagDefinition(
+          {closedByChildren: ['rb', 'rt', 'rtc', 'rp'], closedByParent: true}),
       'optgroup': new HtmlTagDefinition({closedByChildren: ['optgroup'], closedByParent: true}),
-  'option': new HtmlTagDefinition({closedByChildren: ['option', 'optgroup'], closedByParent: true}),
+      'option':
+          new HtmlTagDefinition({closedByChildren: ['option', 'optgroup'], closedByParent: true}),
       'pre': new HtmlTagDefinition({ignoreFirstLf: true}),
       'listing': new HtmlTagDefinition({ignoreFirstLf: true}),
       'style': new HtmlTagDefinition({contentType: TagContentType.RAW_TEXT}),
       'script': new HtmlTagDefinition({contentType: TagContentType.RAW_TEXT}),
       'title': new HtmlTagDefinition({contentType: TagContentType.ESCAPABLE_RAW_TEXT}),
-  'textarea':
-      new HtmlTagDefinition({contentType: TagContentType.ESCAPABLE_RAW_TEXT, ignoreFirstLf: true}),
+      'textarea': new HtmlTagDefinition(
+          {contentType: TagContentType.ESCAPABLE_RAW_TEXT, ignoreFirstLf: true}),
     };
-
-const _DEFAULT_TAG_DEFINITION = new HtmlTagDefinition();
-
-export function getHtmlTagDefinition(tagName: string): HtmlTagDefinition {
+  }
   return TAG_DEFINITIONS[tagName.toLowerCase()] || _DEFAULT_TAG_DEFINITION;
 }

packages/compiler/src/render3/view/template.ts

@@ -1078,8 +1078,14 @@ export class BindingScope implements LocalResolver {
   private map = new Map<string, BindingData>();
   private referenceNameIndex = 0;
   private restoreViewVariable: o.ReadVarExpr|null = null;
+  private static _ROOT_SCOPE: BindingScope;
 
-  static ROOT_SCOPE = new BindingScope().set(0, '$event', o.variable('$event'));
+  static get ROOT_SCOPE(): BindingScope {
+    if (!BindingScope._ROOT_SCOPE) {
+      BindingScope._ROOT_SCOPE = new BindingScope().set(0, '$event', o.variable('$event'));
+    }
+    return BindingScope._ROOT_SCOPE;
+  }
 
   private constructor(public bindingLevel: number = 0, private parent: BindingScope|null = null) {}
 

packages/compiler/src/schema/dom_element_schema_registry.ts

@@ -342,11 +342,11 @@ export class DomElementSchemaRegistry extends ElementSchemaRegistry {
     // property names do not have a security impact.
     tagName = tagName.toLowerCase();
     propName = propName.toLowerCase();
-    let ctx = SECURITY_SCHEMA[tagName + '|' + propName];
+    let ctx = SECURITY_SCHEMA()[tagName + '|' + propName];
     if (ctx) {
       return ctx;
     }
-    ctx = SECURITY_SCHEMA['*|' + propName];
+    ctx = SECURITY_SCHEMA()['*|' + propName];
     return ctx ? ctx : SecurityContext.NONE;
   }
 

packages/compiler/src/schema/dom_security_schema.ts

@@ -20,12 +20,11 @@ import {SecurityContext} from '../core';
 // =================================================================================================
 
 /** Map from tagName|propertyName SecurityContext. Properties applying to all tags use '*'. */
-export const SECURITY_SCHEMA: {[k: string]: SecurityContext} = {};
-
-function registerContext(ctx: SecurityContext, specs: string[]) {
-  for (const spec of specs) SECURITY_SCHEMA[spec.toLowerCase()] = ctx;
-}
+let _SECURITY_SCHEMA !: {[k: string]: SecurityContext};
 
+export function SECURITY_SCHEMA(): {[k: string]: SecurityContext} {
+  if (!_SECURITY_SCHEMA) {
+    _SECURITY_SCHEMA = {};
     // Case is insignificant below, all element and attribute names are lower-cased for lookup.
 
     registerContext(SecurityContext.HTML, [
@@ -56,3 +55,10 @@ registerContext(SecurityContext.RESOURCE_URL, [
       'object|data',
       'script|src',
     ]);
+  }
+  return _SECURITY_SCHEMA;
+}
+
+function registerContext(ctx: SecurityContext, specs: string[]) {
+  for (const spec of specs) _SECURITY_SCHEMA[spec.toLowerCase()] = ctx;
+}

packages/compiler/src/template_parser/template_parser.ts

@@ -57,7 +57,13 @@ const IDENT_EVENT_IDX = 10;
 const TEMPLATE_ATTR_PREFIX = '*';
 const CLASS_ATTR = 'class';
 
-const TEXT_CSS_SELECTOR = CssSelector.parse('*')[0];
+let _TEXT_CSS_SELECTOR !: CssSelector;
+function TEXT_CSS_SELECTOR(): CssSelector {
+  if (!_TEXT_CSS_SELECTOR) {
+    _TEXT_CSS_SELECTOR = CssSelector.parse('*')[0];
+  }
+  return _TEXT_CSS_SELECTOR;
+}
 
 export class TemplateParseError extends ParseError {
   constructor(message: string, span: ParseSourceSpan, level: ParseErrorLevel) {
@@ -227,7 +233,7 @@ class TemplateParseVisitor implements html.Visitor {
   visitExpansionCase(expansionCase: html.ExpansionCase, context: any): any { return null; }
 
   visitText(text: html.Text, parent: ElementContext): any {
-    const ngContentIndex = parent.findNgContentIndex(TEXT_CSS_SELECTOR) !;
+    const ngContentIndex = parent.findNgContentIndex(TEXT_CSS_SELECTOR()) !;
     const valueNoNgsp = replaceNgsp(text.value);
     const expr = this._bindingParser.parseInterpolation(valueNoNgsp, text.sourceSpan !);
     return expr ? new t.BoundTextAst(expr, ngContentIndex, text.sourceSpan !) :
@@ -775,7 +781,7 @@ class NonBindableVisitor implements html.Visitor {
   }
 
   visitText(text: html.Text, parent: ElementContext): t.TextAst {
-    const ngContentIndex = parent.findNgContentIndex(TEXT_CSS_SELECTOR) !;
+    const ngContentIndex = parent.findNgContentIndex(TEXT_CSS_SELECTOR()) !;
     return new t.TextAst(text.value, ngContentIndex, text.sourceSpan !);
   }
 

packages/core/test/bundling/hello_world_r2/bundle.golden_symbols.json

@@ -1439,9 +1439,6 @@
   {
     "name": "SyncAsync"
   },
-  {
-    "name": "TAG_DEFINITIONS"
-  },
   {
     "name": "TAG_TO_PLACEHOLDER_NAMES"
   },
@@ -1730,9 +1727,6 @@
   {
     "name": "_DEFAULT_SOURCE_LANG$1"
   },
-  {
-    "name": "_DEFAULT_TAG_DEFINITION"
-  },
   {
     "name": "_DOCTYPE"
   },
@@ -3509,6 +3503,9 @@
   {
     "name": "refCount"
   },
+  {
+    "name": "registerContext"
+  },
   {
     "name": "registerModuleFactory"
   },