refactor(compiler-cli): extract error documentation base url into separate file (angular#43965)

Prior refactorings caused unexpected g3 sync issues due to a patch that
changes the error documentation URL. This commit moves the base url into
a separate file to make this more apparent.

PR Close angular#43965

Author: JoostK

packages/compiler-cli/src/ngtsc/diagnostics/index.ts

@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-export {COMPILER_ERRORS_WITH_GUIDES, ERROR_DETAILS_PAGE_BASE_URL} from './src/docs';
+export {COMPILER_ERRORS_WITH_GUIDES} from './src/docs';
 export {FatalDiagnosticError, isFatalDiagnosticError, makeDiagnostic, makeRelatedInformation} from './src/error';
 export {ErrorCode} from './src/error_code';
+export {ERROR_DETAILS_PAGE_BASE_URL} from './src/error_details_base_url';
 export {ngErrorCode, replaceTsWithNgInErrors} from './src/util';

packages/compiler-cli/src/ngtsc/diagnostics/src/docs.ts

@@ -8,13 +8,6 @@
 
 import {ErrorCode} from './error_code';
 
-/**
- * Base URL for the error details page.
- * Keep this value in sync with a similar const in
- * `packages/core/src/render3/error_code.ts`.
- */
-export const ERROR_DETAILS_PAGE_BASE_URL = 'https://angular.io/errors';
-
 /**
  * Contains a set of error messages that have detailed guides at angular.io.
  * Full list of available error guides can be found at https://angular.io/errors

packages/compiler-cli/src/ngtsc/diagnostics/src/error_details_base_url.ts

@@ -0,0 +1,16 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * Base URL for the error details page.
+ *
+ * Keep the files below in sync:
+ *  - packages/compiler-cli/src/ngtsc/diagnostics/src/error_details_base_url.ts
+ *  - packages/core/src/render3/error_details_base_url.ts
+ */
+export const ERROR_DETAILS_PAGE_BASE_URL = 'https://angular.io/errors';

packages/core/src/render3/error_code.ts

@@ -6,10 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-// Base URL for the error details page.
-// Keep this value in sync with a similar const in
-// `packages/compiler-cli/src/ngtsc/diagnostics/src/docs.ts`.
-const ERROR_DETAILS_PAGE_BASE_URL = 'https://angular.io/errors';
+import {ERROR_DETAILS_PAGE_BASE_URL} from './error_details_base_url';
 
 export const enum RuntimeErrorCode {
   // Internal Errors

packages/core/src/render3/error_details_base_url.ts

@@ -0,0 +1,16 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * Base URL for the error details page.
+ *
+ * Keep the files below in sync:
+ *  - packages/compiler-cli/src/ngtsc/diagnostics/src/error_details_base_url.ts
+ *  - packages/core/src/render3/error_details_base_url.ts
+ */
+export const ERROR_DETAILS_PAGE_BASE_URL = 'https://angular.io/errors';