feat(generic-spacing): remove space before generic

packages/eslint-plugin-antfu/src/rules/generic-spacing.test.ts

@@ -4,17 +4,21 @@ import rule, { RULE_NAME } from './generic-spacing'
 
 const valids = [
   'type Foo<T = true> = T',
+  'type Foo<T extends true = true> = T',
   `
 type Foo<
   T = true,
   K = false
 > = T`,
-  'type Foo<T extends true = true> = T',
+  `function foo<
+  T
+>() {}`,
 ]
 const invalids = [
   ['type Foo<T=true> = T', 'type Foo<T = true> = T'],
   ['type Foo<T,K> = T', 'type Foo<T, K> = T'],
   ['type Foo<T=false,K=1|2> = T', 'type Foo<T = false, K = 1|2> = T', 3],
+  ['function foo <T>() {}', 'function foo<T>() {}'],
 ] as const
 
 it('runs', () => {

packages/eslint-plugin-antfu/src/rules/generic-spacing.ts

@@ -23,6 +23,20 @@ export default createEslintRule<Options, MessageIds>({
     const sourceCode = context.getSourceCode()
     return {
       TSTypeParameterDeclaration: (node) => {
+        const pre = sourceCode.text.slice(0, node.range[0])
+        const preSpace = pre.match(/(\s+)$/)?.[0]
+        // strip space before <T>
+        if (preSpace && preSpace.length) {
+          context.report({
+            node,
+            messageId: 'genericSpacingMismatch',
+            *fix(fixer) {
+              yield fixer.replaceTextRange([node.range[0] - preSpace.length, node.range[0]], '')
+            },
+          })
+        }
+
+        // add space between <T,K>
         const params = node.params
         for (let i = 1; i < params.length; i++) {
           const prev = params[i - 1]
@@ -45,6 +59,7 @@ export default createEslintRule<Options, MessageIds>({
           }
         }
       },
+      // add space around = in type Foo<T = true>
       TSTypeParameter: (node) => {
         if (!node.default)
           return