Angular: Configuration Components Deprecation Warning

apps/demos/testing/known-warnings.js

@@ -2,4 +2,5 @@ export const knownWarnings = [
   'W0019 -',
   'W0022 -',
   'W2108 -',
+  'W3001 -'
 ];

packages/devextreme-angular/src/core/deprecated-config-warning.ts

@@ -0,0 +1,81 @@
+import type { BaseNestedOption, INestedOptionContainer } from './nested-option';
+import { DEPRECATED_CONFIG_COMPONENTS } from './deprecated-config-map';
+import WARNING_CODES from './warning-codes';
+import { logWarning } from './warning-helper';
+
+const warnedUsages = new Set<string>();
+
+const LEGACY_CLASS_NAME_REGEXP = /^Dx([io])([A-Za-z0-9]+)Component$/;
+
+type DeprecatedConfigEntry = Record<string, string>;
+
+function getLegacySelector(nestedOption: BaseNestedOption): string | undefined {
+  const className = nestedOption?.constructor?.name;
+  if (!className) {
+    return undefined;
+  }
+
+  const match = LEGACY_CLASS_NAME_REGEXP.exec(className);
+  if (!match) {
+    return undefined;
+  }
+
+  const [, type, rest] = match;
+  const prefix = type === 'o' ? 'dxo-' : 'dxi-';
+
+  return `${prefix}${toKebabCase(rest)}`;
+}
+
+function getHostMapping(host: INestedOptionContainer | undefined): DeprecatedConfigEntry | undefined {
+  const visited = new Set<INestedOptionContainer>();
+  let current = host;
+
+  while (current && !visited.has(current)) {
+    visited.add(current);
+
+    const ctorName = current.constructor?.name;
+    if (ctorName && Object.prototype.hasOwnProperty.call(DEPRECATED_CONFIG_COMPONENTS, ctorName)) {
+      return DEPRECATED_CONFIG_COMPONENTS[ctorName] as DeprecatedConfigEntry;
+    }
+
+    current = (current as { _host?: INestedOptionContainer })._host;
+  }
+
+  return undefined;
+}
+
+export function warnIfLegacyNestedComponent(nestedOption: BaseNestedOption, host: INestedOptionContainer | undefined): void {
+  const legacySelector = getLegacySelector(nestedOption);
+  if (!legacySelector) {
+    return;
+  }
+
+  const mappingEntry = getHostMapping(host);
+  if (!mappingEntry) {
+    return;
+  }
+
+  const replacement = mappingEntry[legacySelector];
+  if (!replacement) {
+    return;
+  }
+
+  const cacheKey = `${legacySelector}|${replacement}`;
+  if (warnedUsages.has(cacheKey)) {
+    return;
+  }
+
+  warnedUsages.add(cacheKey);
+
+  logWarning(
+    WARNING_CODES.LEGACY_CONFIG_COMPONENT_USED,
+    { legacySelector, replacement },
+  );
+}
+
+function toKebabCase(value: string): string {
+  return value
+    .replace(/([a-z0-9])([A-Z])/g, '$1-$2')
+    .replace(/([A-Z])([A-Z][a-z])/g, '$1-$2')
+    .toLowerCase();
+}

packages/devextreme-angular/src/core/index.ts

@@ -8,3 +8,5 @@ export * from './template';
 export * from './transfer-state';
 export * from './utils';
 export * from './watcher-helper';
+export * from './warning-helper';
+export * from './warning-codes';

packages/devextreme-angular/src/core/nested-option.ts

@@ -6,6 +6,7 @@ import render from 'devextreme/core/renderer';
 import { triggerHandler } from 'devextreme/events';
 import domAdapter from 'devextreme/core/dom_adapter';
 import { getElement } from './utils';
+import { warnIfLegacyNestedComponent } from './deprecated-config-warning';
 import { DX_TEMPLATE_WRAPPER_CLASS } from './template';
 
 const VISIBILITY_CHANGE_SELECTOR = 'dx-visibility-change-handler';
@@ -292,5 +293,6 @@ export class NestedOptionHost {
 
   setNestedOption(nestedOption: BaseNestedOption) {
     nestedOption.setHost(this._host, this._optionPath);
+    warnIfLegacyNestedComponent(nestedOption, this._host);
   }
 }

packages/devextreme-angular/src/core/warning-codes.ts

@@ -0,0 +1,13 @@
+const WARNING_CODES = {
+  LEGACY_CONFIG_COMPONENT_USED: {
+    code: 'W3001',
+    template: 'You are using the legacy {legacySelector} configuration component. We recommend '
+      + 'upgrading to the new {replacement} configuration component.',
+    // TODO: link to docs article, when available
+  },
+} as const;
+
+export type WarningId = keyof typeof WARNING_CODES;
+export type WarningDefinition = typeof WARNING_CODES[WarningId];
+
+export default WARNING_CODES;

packages/devextreme-angular/src/core/warning-helper.ts

@@ -0,0 +1,35 @@
+import type { WarningDefinition } from './warning-codes';
+
+type TemplatePrimitive = string | number | boolean;
+export type TemplateArgs = TemplatePrimitive[] | Record<string, TemplatePrimitive>;
+
+function formatWarningMessage(template: string, args?: TemplateArgs): string {
+  if (!args) {
+    return template;
+  }
+
+  if (Array.isArray(args)) {
+    return args.reduce<string>(
+      (message, value, index) => replacePlaceholder(message, `{${index}}`, String(value)),
+      template,
+    );
+  }
+
+  return (Object.entries(args) as Array<[string, TemplatePrimitive]>).reduce<string>(
+    (message, [key, value]) => replacePlaceholder(message, `{${key}}`, String(value)),
+    template,
+  );
+}
+
+export function logWarning(warning: WarningDefinition, args?: TemplateArgs): void {
+  if (typeof console === 'undefined' || typeof console.warn !== 'function') {
+    return;
+  }
+
+  const message = formatWarningMessage(warning.template, args);
+  console.warn(`${warning.code} - ${message}`);
+}
+
+function replacePlaceholder(message: string, placeholder: string, value: string): string {
+  return message.split(placeholder).join(value);
+}