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fix(ivy): produce ts.Diagnostics for NgModule scope errors (#29191) 

Previously, when the NgModule scope resolver discovered semantic errors
within a users NgModules, it would throw assertion errors. TODOs in the
codebase indicated these should become ts.Diagnostics eventually.

Besides producing better-looking errors, there is another reason to make
this change asap: these assertions were shadowing actual errors, via an
interesting mechanism:

1) a component would produce a ts.Diagnostic during its analyze() step
2) as a result, it wouldn't register component metadata with the scope
   resolver
3) the NgModule for the component references it in exports, which was
   detected as an invalid export (no metadata registering it as a
   component).
4) the resulting assertion error would crash the compiler, hiding the
   real cause of the problem (an invalid component).

This commit should mitigate this problem by converting scoping errors to
proper ts.Diagnostics. Additionally, we should consider registering some
marker indicating a class is a directive/component/pipe without actually
requiring full metadata to be produced for it, which would allow suppression
of errors like "invalid export" for such invalid types.

PR Close #29191
This commit is contained in:
Alex Rickabaugh 2019-03-08 11:32:49 -08:00 committed by Kara Erickson
parent fc305305e1
commit c37ec8b255
11 changed files with 358 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
packages/compiler-cli/src/ngtsc/annotations/src/ng_module.ts
View File

@ -60,6 +60,7 @@ export class NgModuleDecoratorHandler implements DecoratorHandler<NgModuleAnalys
}
analyze(node: ts.ClassDeclaration, decorator: Decorator): AnalysisOutput<NgModuleAnalysis> {
const name = node.name !.text;
if (decorator.args === null || decorator.args.length > 1) {
throw new FatalDiagnosticError(
ErrorCode.DECORATOR_ARITY_WRONG, decorator.node,
@ -93,28 +94,28 @@ export class NgModuleDecoratorHandler implements DecoratorHandler<NgModuleAnalys
if (ngModule.has('declarations')) {
const expr = ngModule.get('declarations') !;
const declarationMeta = this.evaluator.evaluate(expr, forwardRefResolver);
declarations = this.resolveTypeList(expr, declarationMeta, 'declarations');
declarations = this.resolveTypeList(expr, declarationMeta, name, 'declarations');
}
let imports: Reference<ts.Declaration>[] = [];
let rawImports: ts.Expression|null = null;
if (ngModule.has('imports')) {
rawImports = ngModule.get('imports') !;
const importsMeta = this.evaluator.evaluate(rawImports, moduleResolvers);
imports = this.resolveTypeList(rawImports, importsMeta, 'imports');
imports = this.resolveTypeList(rawImports, importsMeta, name, 'imports');
}
let exports: Reference<ts.Declaration>[] = [];
let rawExports: ts.Expression|null = null;
if (ngModule.has('exports')) {
rawExports = ngModule.get('exports') !;
const exportsMeta = this.evaluator.evaluate(rawExports, moduleResolvers);
exports = this.resolveTypeList(rawExports, exportsMeta, 'exports');
exports = this.resolveTypeList(rawExports, exportsMeta, name, 'exports');
this.referencesRegistry.add(node, ...exports);
}
let bootstrap: Reference<ts.Declaration>[] = [];
if (ngModule.has('bootstrap')) {
const expr = ngModule.get('bootstrap') !;
const bootstrapMeta = this.evaluator.evaluate(expr, forwardRefResolver);
bootstrap = this.resolveTypeList(expr, bootstrapMeta, 'bootstrap');
bootstrap = this.resolveTypeList(expr, bootstrapMeta, name, 'bootstrap');
}
// Register this module's information with the LocalModuleScopeRegistry. This ensures that
@ -156,12 +157,11 @@ export class NgModuleDecoratorHandler implements DecoratorHandler<NgModuleAnalys
}
if (this.routeAnalyzer !== null) {
this.routeAnalyzer.add(
node.getSourceFile(), node.name !.text, rawImports, rawExports, rawProviders);
this.routeAnalyzer.add(node.getSourceFile(), name, rawImports, rawExports, rawProviders);
}
const ngInjectorDef: R3InjectorMetadata = {
name: node.name !.text,
name,
type: new WrappedNodeExpr(node.name !),
deps: getValidConstructorDependencies(node, this.reflector, this.isCore), providers,
imports: new LiteralArrayExpr(injectorImports),
@ -180,10 +180,12 @@ export class NgModuleDecoratorHandler implements DecoratorHandler<NgModuleAnalys
resolve(node: ts.Declaration, analysis: NgModuleAnalysis): ResolveResult {
const scope = this.scopeRegistry.getScopeOfModule(node);
const diagnostics = this.scopeRegistry.getDiagnosticsOfModule(node) || undefined;
if (scope === null || scope.reexports === null) {
return {};
return {diagnostics};
} else {
return {
diagnostics,
reexports: scope.reexports,
};
}
@ -324,12 +326,14 @@ export class NgModuleDecoratorHandler implements DecoratorHandler<NgModuleAnalys
/**
* Compute a list of `Reference`s from a resolved metadata value.
*/
private resolveTypeList(expr: ts.Node, resolvedList: ResolvedValue, name: string):
Reference<ts.Declaration>[] {
private resolveTypeList(
expr: ts.Node, resolvedList: ResolvedValue, className: string,
arrayName: string): Reference<ts.Declaration>[] {
const refList: Reference<ts.Declaration>[] = [];
if (!Array.isArray(resolvedList)) {
throw new FatalDiagnosticError(
ErrorCode.VALUE_HAS_WRONG_TYPE, expr, `Expected array when reading property ${name}`);
ErrorCode.VALUE_HAS_WRONG_TYPE, expr,
`Expected array when reading property ${arrayName}`);
}
resolvedList.forEach((entry, idx) => {
@ -341,17 +345,19 @@ export class NgModuleDecoratorHandler implements DecoratorHandler<NgModuleAnalys
if (Array.isArray(entry)) {
// Recurse into nested arrays.
refList.push(...this.resolveTypeList(expr, entry, name));
refList.push(...this.resolveTypeList(expr, entry, className, arrayName));
} else if (isDeclarationReference(entry)) {
if (!this.reflector.isClass(entry.node)) {
throw new FatalDiagnosticError(
ErrorCode.VALUE_HAS_WRONG_TYPE, entry.node,
`Entry is not a type, but is used as such in ${name} array`);
`Value at position ${idx} in the NgModule.${arrayName}s of ${className} is not a class`);
}
refList.push(entry);
} else {
// TODO(alxhub): expand ModuleWithProviders.
throw new Error(`Value at position ${idx} in ${name} array is not a reference: ${entry}`);
// TODO(alxhub): Produce a better diagnostic here - the array index may be an inner array.
throw new FatalDiagnosticError(
ErrorCode.VALUE_HAS_WRONG_TYPE, expr,
`Value at position ${idx} in the NgModule.${arrayName}s of ${className} is not a reference: ${entry}`);
}
});

2
packages/compiler-cli/src/ngtsc/diagnostics/index.ts
View File

@ -7,5 +7,5 @@
*/
export {ErrorCode, ngErrorCode} from './src/code';
export {FatalDiagnosticError, isFatalDiagnosticError} from './src/error';
export {FatalDiagnosticError, isFatalDiagnosticError, makeDiagnostic} from './src/error';
export {replaceTsWithNgInErrors} from './src/util';

21
packages/compiler-cli/src/ngtsc/diagnostics/src/code.ts
View File

@ -35,6 +35,27 @@ export enum ErrorCode {
* expression containing a pipe.
*/
HOST_BINDING_PARSE_ERROR = 5001,
/**
* Raised when an NgModule contains an invalid reference in `declarations`.
*/
NGMODULE_INVALID_DECLARATION = 6001,
/**
* Raised when an NgModule contains an invalid type in `imports`.
*/
NGMODULE_INVALID_IMPORT = 6002,
/**
* Raised when an NgModule contains an invalid type in `exports`.
*/
NGMODULE_INVALID_EXPORT = 6003,
/**
* Raised when an NgModule contains a type in `exports` which is neither in `declarations` nor
* otherwise imported.
*/
NGMODULE_INVALID_REEXPORT = 6004,
}
export function ngErrorCode(code: ErrorCode): number {

16
packages/compiler-cli/src/ngtsc/diagnostics/src/error.ts
View File

@ -19,17 +19,21 @@ export class FatalDiagnosticError {
_isFatalDiagnosticError = true;
toDiagnostic(): ts.DiagnosticWithLocation {
const node = ts.getOriginalNode(this.node);
return makeDiagnostic(this.code, this.node, this.message);
}
}
export function makeDiagnostic(
code: ErrorCode, node: ts.Node, messageText: string): ts.DiagnosticWithLocation {
node = ts.getOriginalNode(node);
return {
category: ts.DiagnosticCategory.Error,
code: Number('-99' + this.code.valueOf()),
file: ts.getOriginalNode(this.node).getSourceFile(),
code: Number('-99' + code.valueOf()),
file: ts.getOriginalNode(node).getSourceFile(),
start: node.getStart(undefined, false),
length: node.getWidth(),
messageText: this.message,
length: node.getWidth(), messageText,
};
}
}
export function isFatalDiagnosticError(err: any): err is FatalDiagnosticError {
return err._isFatalDiagnosticError === true;

1
packages/compiler-cli/src/ngtsc/scope/BUILD.bazel
View File

@ -9,6 +9,7 @@ ts_library(
]),
deps = [
"//packages/compiler",
"//packages/compiler-cli/src/ngtsc/diagnostics",
"//packages/compiler-cli/src/ngtsc/imports",
"//packages/compiler-cli/src/ngtsc/reflection",
"//packages/compiler-cli/src/ngtsc/typecheck",

149
packages/compiler-cli/src/ngtsc/scope/src/local.ts
View File

@ -9,7 +9,9 @@
import {ExternalExpr} from '@angular/compiler';
import * as ts from 'typescript';
import {ErrorCode, makeDiagnostic} from '../../diagnostics';
import {AliasGenerator, Reexport, Reference, ReferenceEmitter} from '../../imports';
import {identifierOfNode, nodeNameForError} from '../../util/src/typescript';
import {ExportScope, ScopeData, ScopeDirective, ScopePipe} from './api';
import {DtsModuleScopeResolver} from './dependency';
@ -40,6 +42,9 @@ export interface LocalModuleScope extends ExportScope {
* `getScopeOfModule` or `getScopeForComponent` can be called, which traverses the NgModule graph
* and applies the NgModule logic to generate a `LocalModuleScope`, the full scope for the given
* module or component.
*
* The `LocalModuleScopeRegistry` is also capable of producing `ts.Diagnostic` errors when Angular
* semantics are violated.
*/
export class LocalModuleScopeRegistry {
/**
@ -75,8 +80,11 @@ export class LocalModuleScopeRegistry {
/**
* A cache of calculated `LocalModuleScope`s for each NgModule declared in the current program.
*
* A value of `undefined` indicates the scope was invalid and produced errors (therefore,
* diagnostics should exist in the `scopeErrors` map).
*/
private cache = new Map<ts.Declaration, LocalModuleScope>();
private cache = new Map<ts.Declaration, LocalModuleScope|undefined>();
/**
* Tracks whether a given component requires "remote scoping".
@ -88,6 +96,11 @@ export class LocalModuleScopeRegistry {
*/
private remoteScoping = new Set<ts.Declaration>();
/**
* Tracks errors accumulated in the processing of scopes for each module declaration.
*/
private scopeErrors = new Map<ts.Declaration, ts.Diagnostic[]>();
constructor(
private dependencyScopeReader: DtsModuleScopeResolver, private refEmitter: ReferenceEmitter,
private aliasGenerator: AliasGenerator|null) {}
@ -124,15 +137,43 @@ export class LocalModuleScopeRegistry {
* Collects registered data for a module and its directives/pipes and convert it into a full
* `LocalModuleScope`.
*
* This method implements the logic of NgModule imports and exports.
* This method implements the logic of NgModule imports and exports. It returns the
* `LocalModuleScope` for the given NgModule if one can be produced, and `null` if no scope is
* available or the scope contains errors.
*/
getScopeOfModule(clazz: ts.Declaration): LocalModuleScope|null {
const scope = this.getScopeOfModuleInternal(clazz);
// Translate undefined -> null.
return scope !== undefined ? scope : null;
}
/**
* Retrieves any `ts.Diagnostic`s produced during the calculation of the `LocalModuleScope` for
* the given NgModule, or `null` if no errors were present.
*/
getDiagnosticsOfModule(clazz: ts.Declaration): ts.Diagnostic[]|null {
// Required to ensure the errors are populated for the given class. If it has been processed
// before, this will be a no-op due to the scope cache.
this.getScopeOfModule(clazz);
if (this.scopeErrors.has(clazz)) {
return this.scopeErrors.get(clazz) !;
} else {
return null;
}
}
/**
* Implementation of `getScopeOfModule` which differentiates between no scope being available
* (returns `null`) and a scope being produced with errors (returns `undefined`).
*/
private getScopeOfModuleInternal(clazz: ts.Declaration): LocalModuleScope|null|undefined {
// Seal the registry to protect the integrity of the `LocalModuleScope` cache.
this.sealed = true;
// Look for cached data if available.
if (this.cache.has(clazz)) {
return this.cache.get(clazz) !;
return this.cache.get(clazz);
}
// `clazz` should be an NgModule previously added to the registry. If not, a scope for it
@ -142,6 +183,10 @@ export class LocalModuleScopeRegistry {
}
const ngModule = this.ngModuleData.get(clazz) !;
// Errors produced during computation of the scope are recorded here. At the end, if this array
// isn't empty then `undefined` will be cached and returned to indicate this scope is invalid.
const diagnostics: ts.Diagnostic[] = [];
// At this point, the goal is to produce two distinct transitive sets:
// - the directives and pipes which are visible to components declared in the NgModule.
// - the directives and pipes which are exported to any NgModules which import this one.
@ -189,10 +234,17 @@ export class LocalModuleScopeRegistry {
// 2) process imports.
for (const decl of ngModule.imports) {
const importScope = this.getExportedScope(decl);
const importScope = this.getExportedScope(decl, diagnostics, clazz, 'import');
if (importScope === null) {
// TODO(alxhub): produce a ts.Diagnostic
throw new Error(`Unknown import: ${decl.debugName}`);
// An import wasn't an NgModule, so record an error.
diagnostics.push(invalidRef(clazz, decl, 'import'));
continue;
} else if (importScope === undefined) {
// An import was an NgModule but contained errors of its own. Record this as an error too,
// because this scope is always going to be incorrect if one of its imports could not be
// read.
diagnostics.push(invalidTransitiveNgModuleRef(clazz, decl, 'import'));
continue;
}
for (const directive of importScope.exported.directives) {
compilationDirectives.set(directive.ref.node, directive);
@ -209,8 +261,14 @@ export class LocalModuleScopeRegistry {
// imported types.
for (const decl of ngModule.exports) {
// Attempt to resolve decl as an NgModule.
const importScope = this.getExportedScope(decl);
if (importScope !== null) {
const importScope = this.getExportedScope(decl, diagnostics, clazz, 'export');
if (importScope === undefined) {
// An export was an NgModule but contained errors of its own. Record this as an error too,
// because this scope is always going to be incorrect if one of its exports could not be
// read.
diagnostics.push(invalidTransitiveNgModuleRef(clazz, decl, 'export'));
continue;
} else if (importScope !== null) {
// decl is an NgModule.
for (const directive of importScope.exported.directives) {
exportDirectives.set(directive.ref.node, directive);
@ -228,8 +286,12 @@ export class LocalModuleScopeRegistry {
exportPipes.set(decl.node, pipe);
} else {
// decl is an unknown export.
// TODO(alxhub): produce a ts.Diagnostic
throw new Error(`Unknown export: ${decl.debugName}`);
if (this.directiveData.has(decl.node) || this.pipeData.has(decl.node)) {
diagnostics.push(invalidReexport(clazz, decl));
} else {
diagnostics.push(invalidRef(clazz, decl, 'export'));
}
continue;
}
}
@ -272,7 +334,17 @@ export class LocalModuleScopeRegistry {
}
}
// Check if this scope had any errors during production.
if (diagnostics.length > 0) {
// Cache undefined, to mark the fact that the scope is invalid.
this.cache.set(clazz, undefined);
// Save the errors for retrieval.
this.scopeErrors.set(clazz, diagnostics);
// Return undefined to indicate the scope is invalid.
return undefined;
}
// Finally, produce the `LocalModuleScope` with both the compilation and export scopes.
const scope = {
@ -302,18 +374,30 @@ export class LocalModuleScopeRegistry {
*
* The NgModule in question may be declared locally in the current ts.Program, or it may be
* declared in a .d.ts file.
*
* This function will return `null` if no scope could be found, or `undefined` if an invalid scope
* was found. It can also contribute diagnostics of its own by adding to the given `diagnostics`
* array parameter.
*/
private getExportedScope(ref: Reference<ts.Declaration>): ExportScope|null {
private getExportedScope(
ref: Reference<ts.Declaration>, diagnostics: ts.Diagnostic[], ownerForErrors: ts.Declaration,
type: 'import'|'export'): ExportScope|null|undefined {
if (ref.node.getSourceFile().isDeclarationFile) {
// The NgModule is declared in a .d.ts file. Resolve it with the `DependencyScopeReader`.
if (!ts.isClassDeclaration(ref.node)) {
// TODO(alxhub): produce a ts.Diagnostic
throw new Error(`Reference to an NgModule ${ref.debugName} which isn't a class?`);
// The NgModule is in a .d.ts file but is not declared as a ts.ClassDeclaration. This is an
// error in the .d.ts metadata.
const code = type === 'import' ? ErrorCode.NGMODULE_INVALID_IMPORT :
ErrorCode.NGMODULE_INVALID_EXPORT;
diagnostics.push(makeDiagnostic(
code, identifierOfNode(ref.node) || ref.node,
`Appears in the NgModule.${type}s of ${nodeNameForError(ownerForErrors)}, but could not be resolved to an NgModule`));
return undefined;
}
return this.dependencyScopeReader.resolve(ref as Reference<ts.ClassDeclaration>);
} else {
// The NgModule is declared locally in the current program. Resolve it from the registry.
return this.getScopeOfModule(ref.node);
return this.getScopeOfModuleInternal(ref.node);
}
}
@ -323,3 +407,40 @@ export class LocalModuleScopeRegistry {
}
}
}
/**
* Produce a `ts.Diagnostic` for an invalid import or export from an NgModule.
*/
function invalidRef(
clazz: ts.Declaration, decl: Reference<ts.Declaration>,
type: 'import' | 'export'): ts.Diagnostic {
const code =
type === 'import' ? ErrorCode.NGMODULE_INVALID_IMPORT : ErrorCode.NGMODULE_INVALID_EXPORT;
const resolveTarget = type === 'import' ? 'NgModule' : 'NgModule, Component, Directive, or Pipe';
return makeDiagnostic(
code, identifierOfNode(decl.node) || decl.node,
`Appears in the NgModule.${type}s of ${nodeNameForError(clazz)}, but could not be resolved to an ${resolveTarget} class`);
}
/**
* Produce a `ts.Diagnostic` for an import or export which itself has errors.
*/
function invalidTransitiveNgModuleRef(
clazz: ts.Declaration, decl: Reference<ts.Declaration>,
type: 'import' | 'export'): ts.Diagnostic {
const code =
type === 'import' ? ErrorCode.NGMODULE_INVALID_IMPORT : ErrorCode.NGMODULE_INVALID_EXPORT;
return makeDiagnostic(
code, identifierOfNode(decl.node) || decl.node,
`Appears in the NgModule.${type}s of ${nodeNameForError(clazz)}, but itself has errors`);
}
/**
* Produce a `ts.Diagnostic` for an exported directive or pipe which was not declared or imported
* by the NgModule in question.
*/
function invalidReexport(clazz: ts.Declaration, decl: Reference<ts.Declaration>): ts.Diagnostic {
return makeDiagnostic(
ErrorCode.NGMODULE_INVALID_REEXPORT, identifierOfNode(decl.node) || decl.node,
`Present in the NgModule.exports of ${nodeNameForError(clazz)} but neither declared nor imported`);
}

8
packages/compiler-cli/src/ngtsc/scope/test/local_spec.ts
View File

@ -126,7 +126,13 @@ describe('LocalModuleScopeRegistry', () => {
registry.registerNgModule(ModuleA.node, {exports: [Dir], imports: [], declarations: []});
registry.registerNgModule(ModuleB.node, {declarations: [Dir], exports: [Dir], imports: []});
expect(() => registry.getScopeOfModule(ModuleA.node)).toThrow();
expect(registry.getScopeOfModule(ModuleA.node)).toBe(null);
// ModuleA should have associated diagnostics as it exports `Dir` without declaring it.
expect(registry.getDiagnosticsOfModule(ModuleA.node)).not.toBeNull();
// ModuleB should have no diagnostics as it correctly declares `Dir`.
expect(registry.getDiagnosticsOfModule(ModuleB.node)).toBeNull();
});
});

5
packages/compiler-cli/src/ngtsc/transform/src/api.ts
View File

@ -123,4 +123,7 @@ export interface CompileResult {
type: Type;
}
export interface ResolveResult { reexports?: Reexport[]; }
export interface ResolveResult {
reexports?: Reexport[];
diagnostics?: ts.Diagnostic[];
}

11
packages/compiler-cli/src/ngtsc/transform/src/compilation.ts
View File

@ -247,6 +247,7 @@ export class IvyCompilation {
for (const match of ivyClass.matchedHandlers) {
if (match.handler.resolve !== undefined && match.analyzed !== null &&
match.analyzed.analysis !== undefined) {
try {
const res = match.handler.resolve(node, match.analyzed.analysis);
if (res.reexports !== undefined) {
const fileName = node.getSourceFile().fileName;
@ -258,6 +259,16 @@ export class IvyCompilation {
fileReexports.set(reexport.asAlias, [reexport.fromModule, reexport.symbolName]);
}
}
if (res.diagnostics !== undefined) {
this._diagnostics.push(...res.diagnostics);
}
} catch (err) {
if (err instanceof FatalDiagnosticError) {
this._diagnostics.push(err.toDiagnostic());
} else {
throw err;
}
}
}
}
});

1
packages/compiler-cli/test/ngtsc/BUILD.bazel
View File

@ -7,6 +7,7 @@ ts_library(
deps = [
"//packages/compiler",
"//packages/compiler-cli",
"//packages/compiler-cli/src/ngtsc/diagnostics",
"//packages/compiler-cli/src/ngtsc/routing",
"//packages/compiler-cli/src/ngtsc/util",
"//packages/compiler-cli/test:test_utils",

134
packages/compiler-cli/test/ngtsc/scope_spec.ts Normal file
View File

@ -0,0 +1,134 @@
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as ts from 'typescript';
import {ErrorCode, ngErrorCode} from '../../src/ngtsc/diagnostics';
import {NgtscTestEnvironment} from './env';
describe('ngtsc module scopes', () => {
let env !: NgtscTestEnvironment;
beforeEach(() => {
env = NgtscTestEnvironment.setup();
env.tsconfig();
});
describe('diagnostics', () => {
describe('imports', () => {
it('should produce an error when an invalid class is imported', () => {
env.write('test.ts', `
import {NgModule} from '@angular/core';
class NotAModule {}
@NgModule({imports: [NotAModule]})
class IsAModule {}
`);
const [error] = env.driveDiagnostics();
expect(error).not.toBeUndefined();
expect(error.messageText).toContain('IsAModule');
expect(error.messageText).toContain('NgModule.imports');
expect(error.code).toEqual(ngErrorCode(ErrorCode.NGMODULE_INVALID_IMPORT));
expect(diagnosticToNode(error, ts.isIdentifier).text).toEqual('NotAModule');
});
it('should produce an error when a non-class is imported from a .d.ts dependency', () => {
env.write('dep.d.ts', `export declare let NotAClass: Function;`);
env.write('test.ts', `
import {NgModule} from '@angular/core';
import {NotAClass} from './dep';
@NgModule({imports: [NotAClass]})
class IsAModule {}
`);
const [error] = env.driveDiagnostics();
expect(error).not.toBeUndefined();
expect(error.messageText).toContain('IsAModule');
expect(error.messageText).toContain('NgModule.imports');
expect(error.code).toEqual(ngErrorCode(ErrorCode.VALUE_HAS_WRONG_TYPE));
expect(diagnosticToNode(error, ts.isIdentifier).text).toEqual('NotAClass');
});
});
describe('exports', () => {
it('should produce an error when a non-NgModule class is exported', () => {
env.write('test.ts', `
import {NgModule} from '@angular/core';
class NotAModule {}
@NgModule({exports: [NotAModule]})
class IsAModule {}
`);
const [error] = env.driveDiagnostics();
expect(error).not.toBeUndefined();
expect(error.messageText).toContain('IsAModule');
expect(error.messageText).toContain('NgModule.exports');
expect(error.code).toEqual(ngErrorCode(ErrorCode.NGMODULE_INVALID_EXPORT));
expect(diagnosticToNode(error, ts.isIdentifier).text).toEqual('NotAModule');
});
it('should produce a transitive error when an invalid NgModule is exported', () => {
env.write('test.ts', `
import {NgModule} from '@angular/core';
export class NotAModule {}
@NgModule({
imports: [NotAModule],
})
class InvalidModule {}
@NgModule({exports: [InvalidModule]})
class IsAModule {}
`);
// Find the diagnostic referencing InvalidModule, which should have come from IsAModule.
const error = env.driveDiagnostics().find(
error => diagnosticToNode(error, ts.isIdentifier).text === 'InvalidModule');
if (error === undefined) {
return fail('Expected to find a diagnostic referencing InvalidModule');
}
expect(error.messageText).toContain('IsAModule');
expect(error.messageText).toContain('NgModule.exports');
expect(error.code).toEqual(ngErrorCode(ErrorCode.NGMODULE_INVALID_EXPORT));
});
});
describe('re-exports', () => {
it('should produce an error when a non-declared/imported class is re-exported', () => {
env.write('test.ts', `
import {Directive, NgModule} from '@angular/core';
@Directive({selector: 'test'})
class Dir {}
@NgModule({exports: [Dir]})
class IsAModule {}
`);
const [error] = env.driveDiagnostics();
expect(error).not.toBeUndefined();
expect(error.messageText).toContain('IsAModule');
expect(error.messageText).toContain('NgModule.exports');
expect(error.code).toEqual(ngErrorCode(ErrorCode.NGMODULE_INVALID_REEXPORT));
expect(diagnosticToNode(error, ts.isIdentifier).text).toEqual('Dir');
});
});
});
});
function diagnosticToNode<T extends ts.Node>(
diag: ts.Diagnostic, guard: (node: ts.Node) => node is T): T {
if (diag.file === undefined) {
throw new Error(`Expected ts.Diagnostic to have a file source`);
}
const node = (ts as any).getTokenAtPosition(diag.file, diag.start) as ts.Node;
expect(guard(node)).toBe(true);
return node as T;
}