could-be-type.ts

/**
 * @license Use of this source code is governed by an MIT-style license that
 * can be found in the LICENSE file at https://github.com/cartant/tsutils-etc
 */

import * as ts from "typescript";
import { isIntersectionType } from "./is-intersection-type";
import { isReferenceType } from "./is-reference-type";
import { isType } from "./is-type";
import { isUnionType } from "./is-union-type";

export function couldBeType(
  type: ts.Type,
  name: string | RegExp,
  qualified?: {
    name: RegExp;
    typeChecker: ts.TypeChecker;
  }
): boolean {
  if (isReferenceType(type)) {
    type = type.target;
  }

  if (isType(type, name, qualified)) {
    return true;
  }

  if (isIntersectionType(type) || isUnionType(type)) {
    return type.types.some(t => couldBeType(t, name, qualified));
  }

  const baseTypes = type.getBaseTypes();
  if (!baseTypes) {
    return false;
  }
  return baseTypes.some(t => couldBeType(t, name, qualified));
}