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refactor(core): undecorated classes migration should not decorate classes if not needed (#32319) 

Currently the undecorated classes migration decorates base classes if no
explicit constructor is defined on all classes in the inheritance chain.

We only want to decorate base classes which define a constructor that is
inherited. Additionally for best practice, all classes in between the class
that inherits the constructor and the one that defines it are also decorated.

PR Close #32319
This commit is contained in:
Paul Gschwendtner 2019-08-26 18:34:15 +02:00 committed by Miško Hevery
parent 543631f2b3
commit 60a056d5dc
2 changed files with 65 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

95
packages/core/schematics/migrations/undecorated-classes-with-di/transform.ts
View File

@ -97,6 +97,21 @@ export class UndecoratedClassesTransform {
}
private _migrateProviderBaseClass(node: ts.ClassDeclaration): TransformFailure[] {
return this._migrateDecoratedClassWithInheritedCtor(
node, symbol => this.metadataResolver.isInjectable(symbol),
node => this._addInjectableDecorator(node));
}
private _migrateDirectiveBaseClass(node: ts.ClassDeclaration): TransformFailure[] {
return this._migrateDecoratedClassWithInheritedCtor(
node, symbol => this.metadataResolver.isDirective(symbol),
node => this._addAbstractDirectiveDecorator(node));
}
private _migrateDecoratedClassWithInheritedCtor(
node: ts.ClassDeclaration, isClassDecorated: (symbol: StaticSymbol) => boolean,
addClassDecorator: (node: ts.ClassDeclaration) => void): TransformFailure[] {
// In case the provider has an explicit constructor, we don't need to do anything
// because the class is already decorated and does not inherit a constructor.
if (hasExplicitConstructor(node)) {
@ -104,77 +119,43 @@ export class UndecoratedClassesTransform {
}
const orderedBaseClasses = findBaseClassDeclarations(node, this.typeChecker);
let lastDecoratedClass: ts.ClassDeclaration = node;
const undecoratedBaseClasses: ts.ClassDeclaration[] = [];
for (let {node: baseClass, identifier} of orderedBaseClasses) {
const baseClassFile = baseClass.getSourceFile();
if (hasExplicitConstructor(baseClass)) {
// All classes in between the decorated class and the undecorated class
// that defines the constructor need to be decorated as well.
undecoratedBaseClasses.forEach(b => addClassDecorator(b));
if (baseClassFile.isDeclarationFile) {
const staticSymbol = this._getStaticSymbolOfIdentifier(identifier);
// If the base class is decorated through metadata files, we don't
// need to add a comment to the derived class for the external base class.
if (staticSymbol && this.metadataResolver.isInjectable(staticSymbol)) {
if (staticSymbol && isClassDecorated(staticSymbol)) {
break;
}
// If the base class is not decorated, we cannot decorate the base class and
// need to a comment to the last decorated class.
// Find the last class in the inheritance chain that is decorated and will be
// used as anchor for a comment explaining that the class that defines the
// constructor cannot be decorated automatically.
const lastDecoratedClass =
undecoratedBaseClasses[undecoratedBaseClasses.length - 1] || node;
return this._addMissingExplicitConstructorTodo(lastDecoratedClass);
}
this._addInjectableDecorator(baseClass);
// Decorate the class that defines the constructor that is inherited.
addClassDecorator(baseClass);
break;
}
// Add the "@Injectable" decorator for all base classes in the inheritance chain
// until the base class with the explicit constructor. The decorator will be only
// Add the class decorator for all base classes in the inheritance chain until
// the base class with the explicit constructor. The decorator will be only
// added for base classes which can be modified.
if (!baseClassFile.isDeclarationFile) {
this._addInjectableDecorator(baseClass);
lastDecoratedClass = baseClass;
}
}
return [];
}
private _migrateDirectiveBaseClass(node: ts.ClassDeclaration): TransformFailure[] {
// In case the directive has an explicit constructor, we don't need to do
// anything because the class is already decorated with "@Directive" or "@Component"
if (hasExplicitConstructor(node)) {
return [];
}
const orderedBaseClasses = findBaseClassDeclarations(node, this.typeChecker);
let lastDecoratedClass: ts.ClassDeclaration = node;
for (let {node: baseClass, identifier} of orderedBaseClasses) {
const baseClassFile = baseClass.getSourceFile();
if (hasExplicitConstructor(baseClass)) {
if (baseClassFile.isDeclarationFile) {
// If the base class is decorated through metadata files, we don't
// need to add a comment to the derived class for the external base class.
if (this._hasDirectiveMetadata(identifier)) {
break;
}
// If the base class is not decorated, we cannot decorate the base class and
// need to a comment to the last decorated class.
return this._addMissingExplicitConstructorTodo(lastDecoratedClass);
}
this._addAbstractDirectiveDecorator(baseClass);
break;
}
// Add the abstract directive decorator for all base classes in the inheritance
// chain until the base class with the explicit constructor. The decorator will
// be only added for base classes which can be modified.
if (!baseClassFile.isDeclarationFile) {
this._addAbstractDirectiveDecorator(baseClass);
lastDecoratedClass = baseClass;
undecoratedBaseClasses.push(baseClass);
}
}
return [];
@ -387,20 +368,6 @@ export class UndecoratedClassesTransform {
}
}
/**
* Whether the given identifier resolves to a class declaration that
* has metadata for a directive.
*/
private _hasDirectiveMetadata(node: ts.Identifier): boolean {
const symbol = this._getStaticSymbolOfIdentifier(node);
if (!symbol) {
return false;
}
return this.metadataResolver.isDirective(symbol);
}
/**
* Resolves the declaration metadata of a given static symbol. The metadata
* is determined by resolving metadata for the static symbol.

33
packages/core/schematics/test/undecorated_classes_with_di_migration_spec.ts
View File

@ -209,6 +209,39 @@ describe('Undecorated classes with DI migration', () => {
export class MyPipe extends PipeTransform {}`);
});
it('should not decorate base class if no constructor is inherited', () => {
writeFile('/index.ts', dedent `
import {Component, NgModule, Directive} from '@angular/core';
export class BaseClassWithoutCtor {
someUnrelatedProp = true;
}
@Directive({selector: 'my-dir'})
export class MyDirective extends BaseClassWithoutCtor {}
@Pipe()
export class MyPipe extends BaseClassWithoutCtor {}
@NgModule({declarations: [MyDirective, MyPipe]})
export class AppModule {}
`);
runMigration();
expect(tree.readContent('/index.ts')).toContain(dedent `
export class BaseClassWithoutCtor {
someUnrelatedProp = true;
}
@Directive({selector: 'my-dir'})
export class MyDirective extends BaseClassWithoutCtor {}
@Pipe()
export class MyPipe extends BaseClassWithoutCtor {}`);
});
it('should not decorate base class if directive/component/provider defines a constructor', () => {
writeFile('/index.ts', dedent `
import {Component, Injectable, NgModule, NgZone} from '@angular/core';