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alias.ts
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alias.ts
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import * as ts from 'typescript';
import { ReferenceType } from '../../models/index';
import { Component, ConverterTypeComponent, TypeNodeConverter } from '../components';
import { Context } from '../context';
@Component({name: 'type:alias'})
export class AliasConverter extends ConverterTypeComponent implements TypeNodeConverter<ts.Type, ts.TypeReferenceNode> {
/**
* The priority this converter should be executed with.
* A higher priority means the converter will be applied earlier.
*/
priority = 100;
/**
* Test whether the given node and type definitions represent a type alias.
*
* The compiler resolves type aliases pretty early and there is no field telling us
* whether the given node was a type alias or not. So we have to compare the type name of the
* node with the type name of the type symbol.
*
* @param context The context object describing the current state the converter is in.
* @param node The node that should be tested.
* @param type The type of the node that should be tested.
* @returns TRUE when the given node and type look like a type alias, otherwise FALSE.
*/
supportsNode(context: Context, node: ts.TypeReferenceNode, type: ts.Type): boolean {
if (!type || !node || !node.typeName) {
return false;
}
if (!type.symbol) {
return true;
}
const checker = context.checker;
const fqn = checker.getFullyQualifiedName(type.symbol);
let symbolName = fqn.replace(/".*"\./, '').split('.');
if (!symbolName.length) {
return false;
}
let nodeName = node.typeName.getText().split('.');
if (!nodeName.length) {
return false;
}
let common = Math.min(symbolName.length, nodeName.length);
symbolName = symbolName.slice(-common);
nodeName = nodeName.slice(-common);
return nodeName.join('.') !== symbolName.join('.');
}
/**
* Create a reflection for the given type alias node.
*
* This is a node based converter with no type equivalent.
*
* Use [[isTypeAlias]] beforehand to test whether a given type/node combination is
* pointing to a type alias.
*
* ```
* type MyNumber = number;
* let someValue: MyNumber;
* ```
*
* @param node The node whose type should be reflected.
* @returns A type reference pointing to the type alias definition.
*/
convertNode(context: Context, node: ts.TypeReferenceNode): ReferenceType {
const name = node.typeName.getText();
const result = new ReferenceType(name, ReferenceType.SYMBOL_ID_RESOLVE_BY_NAME);
if (node.typeArguments) {
result.typeArguments = this.owner.convertTypes(context, node.typeArguments);
}
return result;
}
}