@studnicky/domain-purity

Restricts configured impure dependencies in files resolved to the configured domain layer. It reports static and dynamic imports whose specifier equals a forbiddenImports entry or starts with that entry followed by /. It also reports a call when any suffix of its resolved dotted callee name is in forbiddenCalls.

The callee resolver supports identifier/member chains, string-literal bracket access such as Date['now'](), and a directly destructured property such as const { now } = Date; now(). Files outside the resolved domain layer are out of scope.

The rule is implemented and registered, but this repository deliberately does not enable it. It reports one violation for BaseError's legitimate Date.now() timestamp. This rule, adapter-only-import, and known-types-outside-adapters assume a business-logic core with a conversion boundary. Substrate has neither: it has four utility and infrastructure bands, no domain layer, and no separate intake boundary.

Fixable: No · Options: Yes · Suggested severity: error

Options

Layer resolution uses the same required ordered bindings, layers, and sourceRoot options as layer-import-boundary. A binding has kind, layer, and (except for builtin) pattern; the first applicable binding wins. folder and package match the path segment after sourceRoot; module and dependency prefix-match import specifiers; and builtin matches Node builtins. allowedImports is accepted as a shared option but is not consulted by this rule.

Name	Type	Default	Description
bindings	{ kind, layer, pattern? }[]	(required)	Ordered layer-resolution bindings.
layers	string[]	(required)	Configured layer names.
sourceRoot	string	(required)	Path segment(s) before the folder/package candidate.
allowedImports	Record<string, string[]>	undefined	Shared layer option; unused by this rule.
domainLayerName	string	"domain"	Layer where the restriction applies.
forbiddenImports	string[]	undefined	Import roots forbidden in that layer.
forbiddenCalls	string[]	undefined	Dotted callee names forbidden in that layer.

✗ Incorrect

// A domain-layer file imports a configured forbidden dependency.
import axios from 'axios';

// A configured dotted call is forbidden in a domain-layer file.
const timestamp = Date.now();

const { now } = Date;
now();

✓ Correct

// This import is not listed in forbiddenImports.
import { User } from './User.js';

// Files resolved outside the domain layer are out of scope.
const timestamp = Date.now();