feat(eslint-plugin): [space-infix-ops] missing error report for conditional types (typescript-eslint#5041)

Author: holazz

packages/eslint-plugin/src/rules/space-infix-ops.ts

@@ -69,7 +69,10 @@ export default util.createRule<Options, MessageIds>({
     };
 
     function isSpaceChar(token: TSESTree.Token): boolean {
-      return token.type === AST_TOKEN_TYPES.Punctuator && token.value === '=';
+      return (
+        token.type === AST_TOKEN_TYPES.Punctuator &&
+        /^[=|?|:]$/.test(token.value)
+      );
     }
 
     function checkAndReportAssignmentSpace(
@@ -180,13 +183,29 @@ export default util.createRule<Options, MessageIds>({
       checkAndReportAssignmentSpace(node, leftNode, rightNode);
     }
 
+    function checkForTypeConditional(node: TSESTree.TSConditionalType): void {
+      const extendsTypeNode = sourceCode.getTokenByRangeStart(
+        node.extendsType.range[0],
+      )!;
+      const trueTypeNode = sourceCode.getTokenByRangeStart(
+        node.trueType.range[0],
+      )!;
+      const falseTypeNode = sourceCode.getTokenByRangeStart(
+        node.falseType.range[0],
+      );
+
+      checkAndReportAssignmentSpace(node, extendsTypeNode, trueTypeNode);
+      checkAndReportAssignmentSpace(node, trueTypeNode, falseTypeNode);
+    }
+
     return {
       ...rules,
       TSEnumMember: checkForEnumAssignmentSpace,
       PropertyDefinition: checkForPropertyDefinitionAssignmentSpace,
       TSTypeAliasDeclaration: checkForTypeAliasAssignment,
       TSUnionType: checkForTypeAnnotationSpace,
       TSIntersectionType: checkForTypeAnnotationSpace,
+      TSConditionalType: checkForTypeConditional,
     };
   },
 });

packages/eslint-plugin/tests/rules/space-infix-ops.test.ts

@@ -977,6 +977,116 @@ ruleTester.run('space-infix-ops', rule, {
         },
       ],
     },
+    {
+      code: `
+        type Test<T> = T extends boolean?true:false
+      `,
+      output: `
+        type Test<T> = T extends boolean ? true : false
+      `,
+      errors: [
+        {
+          messageId: 'missingSpace',
+          column: 41,
+          line: 2,
+        },
+        {
+          messageId: 'missingSpace',
+          column: 46,
+          line: 2,
+        },
+      ],
+    },
+    {
+      code: `
+        type Test<T> = T extends boolean? true :false
+      `,
+      output: `
+        type Test<T> = T extends boolean ? true : false
+      `,
+      errors: [
+        {
+          messageId: 'missingSpace',
+          column: 41,
+          line: 2,
+        },
+        {
+          messageId: 'missingSpace',
+          column: 48,
+          line: 2,
+        },
+      ],
+    },
+    {
+      code: `
+        type Test<T> = T extends boolean?
+          true :false
+      `,
+      output: `
+        type Test<T> = T extends boolean ?
+          true : false
+      `,
+      errors: [
+        {
+          messageId: 'missingSpace',
+          column: 41,
+          line: 2,
+        },
+        {
+          messageId: 'missingSpace',
+          column: 16,
+          line: 3,
+        },
+      ],
+    },
+    {
+      code: `
+        type Test<T> = T extends boolean?
+          true
+          :false
+      `,
+      output: `
+        type Test<T> = T extends boolean ?
+          true
+          : false
+      `,
+      errors: [
+        {
+          messageId: 'missingSpace',
+          column: 41,
+          line: 2,
+        },
+        {
+          messageId: 'missingSpace',
+          column: 11,
+          line: 4,
+        },
+      ],
+    },
+    {
+      code: `
+        type Test<T> = T extends boolean
+          ?true:
+          false
+      `,
+      output: `
+        type Test<T> = T extends boolean
+          ? true :
+          false
+      `,
+      errors: [
+        {
+          messageId: 'missingSpace',
+          column: 11,
+          line: 3,
+        },
+        {
+          messageId: 'missingSpace',
+          column: 16,
+          line: 3,
+        },
+      ],
+    },
     {
       code: `
         interface Test {