117616: Fixed alias-imports edge case where duplicate imports with different aliases were both kept

lint/src/rules/ts/alias-imports.ts

@@ -1,4 +1,5 @@
 import {
+  AST_NODE_TYPES,
   ESLintUtils,
   TSESLint,
   TSESTree,
@@ -12,9 +13,16 @@ import {
 export enum Message {
   NO_ALIAS = 'noAlias',
   WRONG_ALIAS = 'wrongAlias',
+  MULTIPLE_ALIASES = 'multipleAliases',
 }
 
-export const info: DSpaceESLintRuleInfo = {
+interface AliasImportOption {
+  package: string;
+  imported: string;
+  local: string;
+}
+
+export const info: DSpaceESLintRuleInfo<[[AliasImportOption]]> = {
   name: 'alias-imports',
   meta: {
     docs: {
@@ -23,6 +31,7 @@ export const info: DSpaceESLintRuleInfo = {
     messages: {
       [Message.NO_ALIAS]: 'This import must be aliased',
       [Message.WRONG_ALIAS]: 'This import uses the wrong alias (should be {{ local }})',
+      [Message.MULTIPLE_ALIASES]: 'This import was used twice with a different alias (should be {{ local }})',
     },
     fixable: 'code',
     type: 'problem',
@@ -54,7 +63,7 @@ export const info: DSpaceESLintRuleInfo = {
 export const rule = ESLintUtils.RuleCreator.withoutDocs({
   ...info,
   create(context: TSESLint.RuleContext<Message, unknown[]>, options: any) {
-    return options[0].reduce((selectors: any, option: any) => {
+    return options[0].reduce((selectors: any, option: AliasImportOption) => {
       selectors[`ImportDeclaration[source.value = "${option.package}"] > ImportSpecifier[imported.name = "${option.imported}"][local.name != "${option.local}"]`] = (node: TSESTree.ImportSpecifier) => handleUnaliasedImport(context, option, node);
       return selectors;
     }, {});
@@ -107,11 +116,28 @@ import { of as observableOf } from 'rxjs';
  * Replaces the incorrectly aliased imports with the ones defined in the defaultOptions
  *
  * @param context The current {@link TSESLint.RuleContext}
- * @param option The current `defaultOptions` that needs to be handled
+ * @param option The current {@link AliasImportOption} that needs to be handled
  * @param node The incorrect import node that should be fixed
  */
-function handleUnaliasedImport(context: TSESLint.RuleContext<Message, unknown[]>, option: any, node: TSESTree.ImportSpecifier): void {
+function handleUnaliasedImport(context: TSESLint.RuleContext<Message, unknown[]>, option: AliasImportOption, node: TSESTree.ImportSpecifier): void {
-  if (node.local.name === node.imported.name) {
+  const hasAliasedImport: boolean = (node.parent as TSESTree.ImportDeclaration).specifiers.find((specifier: TSESTree.ImportClause) => specifier.local.name === option.local && specifier.type === AST_NODE_TYPES.ImportSpecifier && (specifier as TSESTree.ImportSpecifier).imported.name === option.imported) !== undefined;
+
+  if (hasAliasedImport) {
+    context.report({
+      messageId: Message.MULTIPLE_ALIASES,
+      node: node,
+      fix(fixer: TSESLint.RuleFixer) {
+        const commaAfter = context.sourceCode.getTokenAfter(node, {
+          filter: (token: TSESTree.Token) => token.value === ',',
+        });
+        if (commaAfter) {
+          return fixer.removeRange([node.range[0], commaAfter.range[1]]);
+        } else {
+          return fixer.remove(node);
+        }
+      },
+    });
+  } else if (node.local.name === node.imported.name) {
     context.report({
       messageId: Message.NO_ALIAS,
       node: node,

lint/src/util/structure.ts

@@ -17,10 +17,10 @@ export type Meta = RuleMetaData<string, unknown[]>;
 export type Valid = ValidTestCase<unknown[]>;
 export type Invalid = InvalidTestCase<string, unknown[]>;
 
-export interface DSpaceESLintRuleInfo {
+export interface DSpaceESLintRuleInfo<T = unknown[]> {
   name: string;
   meta: Meta,
-  defaultOptions: unknown[],
+  defaultOptions: T,
 }
 
 export interface NamedTests {