@angular/core
Version:
Angular - the core framework
80 lines • 9.22 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { isComponentDef } from '../interfaces/type_checks';
import { getSuperType } from './inherit_definition_feature';
/**
* Fields which exist on either directive or component definitions, and need to be copied from
* parent to child classes by the `ɵɵCopyDefinitionFeature`.
*/
const COPY_DIRECTIVE_FIELDS = [
// The child class should use the providers of its parent.
'providersResolver',
];
/**
* Fields which exist only on component definitions, and need to be copied from parent to child
* classes by the `ɵɵCopyDefinitionFeature`.
*
* The type here allows any field of `ComponentDef` which is not also a property of `DirectiveDef`,
* since those should go in `COPY_DIRECTIVE_FIELDS` above.
*/
const COPY_COMPONENT_FIELDS = [
// The child class should use the template function of its parent, including all template
// semantics.
'template',
'decls',
'consts',
'vars',
'onPush',
'ngContentSelectors',
// The child class should use the CSS styles of its parent, including all styling semantics.
'styles',
'encapsulation',
// The child class should be checked by the runtime in the same way as its parent.
'schemas',
];
/**
* Copies the fields not handled by the `ɵɵInheritDefinitionFeature` from the supertype of a
* definition.
*
* This exists primarily to support ngcc migration of an existing View Engine pattern, where an
* entire decorator is inherited from a parent to a child class. When ngcc detects this case, it
* generates a skeleton definition on the child class, and applies this feature.
*
* The `ɵɵCopyDefinitionFeature` then copies any needed fields from the parent class' definition,
* including things like the component template function.
*
* @param definition The definition of a child class which inherits from a parent class with its
* own definition.
*
* @codeGenApi
*/
export function ɵɵCopyDefinitionFeature(definition) {
let superType = getSuperType(definition.type);
let superDef = undefined;
if (isComponentDef(definition)) {
// Don't use getComponentDef/getDirectiveDef. This logic relies on inheritance.
superDef = superType.ɵcmp;
}
else {
// Don't use getComponentDef/getDirectiveDef. This logic relies on inheritance.
superDef = superType.ɵdir;
}
// Needed because `definition` fields are readonly.
const defAny = definition;
// Copy over any fields that apply to either directives or components.
for (const field of COPY_DIRECTIVE_FIELDS) {
defAny[field] = superDef[field];
}
if (isComponentDef(superDef)) {
// Copy over any component-specific fields.
for (const field of COPY_COMPONENT_FIELDS) {
defAny[field] = superDef[field];
}
}
}
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