typia/src/programmers/internal/random_custom.ts

Superfast runtime validators with only one line

import ts from "typescript";

import { ExpressionFactory } from "../../factories/ExpressionFactory";
import { LiteralFactory } from "../../factories/LiteralFactory";

import { IMetadataTypeTag } from "../../schemas/metadata/IMetadataTypeTag";

import { Customizable } from "../../typings/Customizable";

/**
 * @internal
 */
export const random_custom =
  (accessor: (name: string) => ts.Expression) =>
  (type: keyof Customizable) =>
  (tags: IMetadataTypeTag[]) =>
  (expression: ts.Expression) =>
    ExpressionFactory.coalesce(
      ts.factory.createCallChain(
        ts.factory.createPropertyAccessChain(
          accessor("customs"),
          ts.factory.createToken(ts.SyntaxKind.QuestionDotToken),
          ts.factory.createIdentifier(type),
        ),
        ts.factory.createToken(ts.SyntaxKind.QuestionDotToken),
        undefined,
        [
          LiteralFactory.generate(
            tags.map((t) => ({
              name: t.name,
              kind: t.kind,
              value: t.value,
            })),
          ),
        ],
      ),
    )(expression);