fix(compiler): translate emit diagnostics with `noEmitOnError: true`. (#19953)

This prevents errors reported against `.ngfactory.ts` files show up
as the result of running `ngc`.

Closes #19935
PR Close #19953

packages/compiler-cli/src/diagnostics/translate_diagnostics.ts

@@ -38,10 +38,10 @@ export function translateDiagnostics(host: TypeCheckHost, untranslatedDiagnostic
           source: SOURCE,
           code: DEFAULT_ERROR_CODE
         });
-        return;
       }
+    } else {
+      ts.push(diagnostic);
     }
-    ts.push(diagnostic);
   });
   return {ts, ng};
 }

packages/compiler-cli/src/transformers/program.ts

@@ -18,7 +18,7 @@ import {CompilerHost, CompilerOptions, CustomTransformers, DEFAULT_ERROR_CODE, D
 import {CodeGenerator, TsCompilerAotCompilerTypeCheckHostAdapter, getOriginalReferences} from './compiler_host';
 import {LowerMetadataCache, getExpressionLoweringTransformFactory} from './lower_expressions';
 import {getAngularEmitterTransformFactory} from './node_emitter_transform';
-import {GENERATED_FILES, StructureIsReused, createMessageDiagnostic, isInRootDir, tsStructureIsReused} from './util';
+import {GENERATED_FILES, StructureIsReused, createMessageDiagnostic, isInRootDir, ngToTsDiagnostic, tsStructureIsReused} from './util';
 
 
 
@@ -149,11 +149,9 @@ class AngularCompilerProgram implements Program {
 
   getTsSemanticDiagnostics(sourceFile?: ts.SourceFile, cancellationToken?: ts.CancellationToken):
       ts.Diagnostic[] {
-    if (sourceFile) {
-      return this.tsProgram.getSemanticDiagnostics(sourceFile, cancellationToken);
-    }
+    const sourceFiles = sourceFile ? [sourceFile] : this.tsProgram.getSourceFiles();
     let diags: ts.Diagnostic[] = [];
-    this.tsProgram.getSourceFiles().forEach(sf => {
+    sourceFiles.forEach(sf => {
       if (!GENERATED_FILES.test(sf.fileName)) {
         diags.push(...this.tsProgram.getSemanticDiagnostics(sf, cancellationToken));
       }
@@ -300,6 +298,10 @@ class AngularCompilerProgram implements Program {
       }
     }
     this.emittedSourceFiles = emittedSourceFiles;
+    // translate the diagnostics in the emitResult as well.
+    const translatedEmitDiags = translateDiagnostics(this.hostAdapter, emitResult.diagnostics);
+    emitResult.diagnostics = translatedEmitDiags.ts.concat(
+        this.structuralDiagnostics.concat(translatedEmitDiags.ng).map(ngToTsDiagnostic));
 
     if (!outSrcMapping.length) {
       // if no files were emitted by TypeScript, also don't emit .json files

packages/compiler-cli/src/transformers/util.ts

@@ -51,3 +51,29 @@ function pathStartsWithPrefix(prefix: string, fullPath: string): string|null {
   const rel = path.relative(prefix, fullPath);
   return rel.startsWith('..') ? null : rel;
 }
+
+/**
+ * Converts a ng.Diagnostic into a ts.Diagnostic.
+ * This looses some information, and also uses an incomplete object as `file`.
+ *
+ * I.e. only use this where the API allows only a ts.Diagnostic.
+ */
+export function ngToTsDiagnostic(ng: Diagnostic): ts.Diagnostic {
+  let file: ts.SourceFile|undefined;
+  let start: number|undefined;
+  let length: number|undefined;
+  if (ng.span) {
+    // Note: We can't use a real ts.SourceFile,
+    // but we can at least mirror the properties `fileName` and `text`, which
+    // are mostly used for error reporting.
+    file = { fileName: ng.span.start.file.url, text: ng.span.start.file.content } as ts.SourceFile;
+    start = ng.span.start.offset;
+    length = ng.span.end.offset - start;
+  }
+  return {
+    file,
+    messageText: ng.messageText,
+    category: ng.category,
+    code: ng.code, start, length,
+  };
+}

packages/compiler-cli/test/ngc_spec.ts

@@ -1467,5 +1467,37 @@ describe('ngc transformer command-line', () => {
       expect(exitCode).toBe(2, 'Compile was expected to fail');
       expect(messages[0]).toContain(['Tagged template expressions are not supported in metadata']);
     });
+
+    it('should allow using 2 classes with the same name in declarations with noEmitOnError=true',
+       () => {
+         write('src/tsconfig.json', `{
+        "extends": "../tsconfig-base.json",
+        "compilerOptions": {
+          "noEmitOnError": true
+        },
+        "files": ["test-module.ts"]
+      }`);
+         function writeComp(fileName: string) {
+           write(fileName, `
+        import {Component} from '@angular/core';
+
+        @Component({selector: 'comp', template: ''})
+        export class TestComponent {}
+      `);
+         }
+         writeComp('src/comp1.ts');
+         writeComp('src/comp2.ts');
+         write('src/test-module.ts', `
+        import {NgModule} from '@angular/core';
+        import {TestComponent as Comp1} from './comp1';
+        import {TestComponent as Comp2} from './comp2';
+
+        @NgModule({
+          declarations: [Comp1, Comp2],
+        })
+        export class MyModule {}
+      `);
+         expect(main(['-p', path.join(basePath, 'src/tsconfig.json')])).toBe(0);
+       });
   });
 });

packages/compiler-cli/test/transformers/program_spec.ts

@@ -11,6 +11,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import * as ts from 'typescript';
 
+import {formatDiagnostics} from '../../src/perform_compile';
 import {CompilerHost, EmitFlags, LazyRoute} from '../../src/transformers/api';
 import {createSrcToOutPathMapper} from '../../src/transformers/program';
 import {GENERATED_FILES, StructureIsReused, tsStructureIsReused} from '../../src/transformers/util';
@@ -858,4 +859,34 @@ describe('ng program', () => {
       }]);
     });
   });
+
+  it('should report errors for ts and ng errors on emit with noEmitOnError=true', () => {
+    testSupport.writeFiles({
+      'src/main.ts': `
+        import {Component, NgModule} from '@angular/core';
+
+        // Ts error
+        let x: string = 1;
+
+        // Ng error
+        @Component({selector: 'comp', templateUrl: './main.html'})
+        export class MyComp {}
+
+        @NgModule({declarations: [MyComp]})
+        export class MyModule {}
+        `,
+      'src/main.html': '{{nonExistent}}'
+    });
+    const options = testSupport.createCompilerOptions({noEmitOnError: true});
+    const host = ng.createCompilerHost({options});
+    const program1 = ng.createProgram(
+        {rootNames: [path.resolve(testSupport.basePath, 'src/main.ts')], options, host});
+    const errorDiags =
+        program1.emit().diagnostics.filter(d => d.category === ts.DiagnosticCategory.Error);
+    expect(formatDiagnostics(errorDiags))
+        .toContain(`src/main.ts(5,13): error TS2322: Type '1' is not assignable to type 'string'.`);
+    expect(formatDiagnostics(errorDiags))
+        .toContain(
+            `src/main.html(1,1): error TS100: Property 'nonExistent' does not exist on type 'MyComp'.`);
+  });
 });

packages/compiler/src/aot/compiler.ts

@@ -193,6 +193,7 @@ export class AotCompiler {
 
   private _createNgFactoryStub(
       outputCtx: OutputContext, file: NgAnalyzedFile, emitFlags: StubEmitFlags) {
+    let componentId = 0;
     file.ngModules.forEach((ngModuleMeta, ngModuleIndex) => {
       // Note: the code below needs to executed for StubEmitFlags.Basic and StubEmitFlags.TypeCheck,
       // so we don't change the .ngfactory file too much when adding the typecheck block.
@@ -230,12 +231,14 @@ export class AotCompiler {
           if (!compMeta.isComponent) {
             return;
           }
+          componentId++;
           this._createTypeCheckBlock(
-              outputCtx, ngModuleMeta, this._metadataResolver.getHostComponentMetadata(compMeta),
-              [compMeta.type], externalReferenceVars);
-          this._createTypeCheckBlock(
-              outputCtx, ngModuleMeta, compMeta, ngModuleMeta.transitiveModule.directives,
+              outputCtx, `${compMeta.type.reference.name}_Host_${componentId}`, ngModuleMeta,
+              this._metadataResolver.getHostComponentMetadata(compMeta), [compMeta.type],
               externalReferenceVars);
+          this._createTypeCheckBlock(
+              outputCtx, `${compMeta.type.reference.name}_${componentId}`, ngModuleMeta, compMeta,
+              ngModuleMeta.transitiveModule.directives, externalReferenceVars);
         });
       }
     });
@@ -246,12 +249,13 @@ export class AotCompiler {
   }
 
   private _createTypeCheckBlock(
-      ctx: OutputContext, moduleMeta: CompileNgModuleMetadata, compMeta: CompileDirectiveMetadata,
-      directives: CompileIdentifierMetadata[], externalReferenceVars: Map<any, string>) {
+      ctx: OutputContext, componentId: string, moduleMeta: CompileNgModuleMetadata,
+      compMeta: CompileDirectiveMetadata, directives: CompileIdentifierMetadata[],
+      externalReferenceVars: Map<any, string>) {
     const {template: parsedTemplate, pipes: usedPipes} =
         this._parseTemplate(compMeta, moduleMeta, directives);
     ctx.statements.push(...this._typeCheckCompiler.compileComponent(
-        compMeta, parsedTemplate, usedPipes, externalReferenceVars));
+        componentId, compMeta, parsedTemplate, usedPipes, externalReferenceVars));
   }
 
   emitMessageBundle(analyzeResult: NgAnalyzedModules, locale: string|null): MessageBundle {

packages/compiler/src/view_compiler/type_check_compiler.ts

@@ -9,7 +9,7 @@
 import {AotCompilerOptions} from '../aot/compiler_options';
 import {StaticReflector} from '../aot/static_reflector';
 import {StaticSymbol} from '../aot/static_symbol';
-import {CompileDiDependencyMetadata, CompileDirectiveMetadata, CompilePipeSummary, viewClassName} from '../compile_metadata';
+import {CompileDiDependencyMetadata, CompileDirectiveMetadata, CompilePipeSummary} from '../compile_metadata';
 import {BuiltinConverter, EventHandlerVars, LocalResolver, convertActionBinding, convertPropertyBinding, convertPropertyBindingBuiltins} from '../compiler_util/expression_converter';
 import {AST, ASTWithSource, Interpolation} from '../expression_parser/ast';
 import {Identifiers} from '../identifiers';
@@ -33,7 +33,8 @@ export class TypeCheckCompiler {
    *   and also violate the point above.
    */
   compileComponent(
-      component: CompileDirectiveMetadata, template: TemplateAst[], usedPipes: CompilePipeSummary[],
+      componentId: string, component: CompileDirectiveMetadata, template: TemplateAst[],
+      usedPipes: CompilePipeSummary[],
       externalReferenceVars: Map<StaticSymbol, string>): o.Statement[] {
     const pipes = new Map<string, StaticSymbol>();
     usedPipes.forEach(p => pipes.set(p.name, p.type.reference));
@@ -48,7 +49,7 @@ export class TypeCheckCompiler {
     const visitor = viewBuilderFactory(null);
     visitor.visitAll([], template);
 
-    return visitor.build();
+    return visitor.build(componentId);
   }
 }
 
@@ -103,8 +104,8 @@ class ViewBuilder implements TemplateAstVisitor, LocalResolver {
     templateVisitAll(this, astNodes);
   }
 
-  build(targetStatements: o.Statement[] = []): o.Statement[] {
-    this.children.forEach((child) => child.build(targetStatements));
+  build(componentId: string, targetStatements: o.Statement[] = []): o.Statement[] {
+    this.children.forEach((child) => child.build(componentId, targetStatements));
     const viewStmts: o.Statement[] =
         [o.variable(DYNAMIC_VAR_NAME).set(o.NULL_EXPR).toDeclStmt(o.DYNAMIC_TYPE)];
     let bindingCount = 0;
@@ -128,7 +129,7 @@ class ViewBuilder implements TemplateAstVisitor, LocalResolver {
           (stmt: o.Statement) => o.applySourceSpanToStatementIfNeeded(stmt, sourceSpan)));
     });
 
-    const viewName = `_View_${this.component.name}_${this.embeddedViewIndex}`;
+    const viewName = `_View_${componentId}_${this.embeddedViewIndex}`;
     const viewFactory = new o.DeclareFunctionStmt(viewName, [], viewStmts);
     targetStatements.push(viewFactory);
     return targetStatements;