fix: loosen explicit-function-return-type

This fixes #110.

Author: swansontec

src/fixture.ts

@@ -24,3 +24,13 @@ export interface Boo { b_oo: null }
  * ESLint should ignore this `no-undef` violation because that rule is turned off for TypeScript.
  */
 // console.log(undef)
+
+/**
+ * https://github.com/standard/eslint-config-standard-with-typescript/issues/110
+ */
+// Inline callbacks don't need return types:
+setTimeout(() => {}, 1)
+
+// The return type is clear from the left side of the assignment:
+const double: ((n: number) => number) = n => n * 2
+;[1, 2].map(double)

src/index.test.ts

@@ -21,7 +21,9 @@ test('export', (t): void => {
           '@typescript-eslint/array-type': ['error', 'array-simple'],
           '@typescript-eslint/camelcase': ['error', { properties: 'never' }],
           '@typescript-eslint/explicit-function-return-type': ['error', {
-            allowHigherOrderFunctions: true
+            allowExpressions: true,
+            allowHigherOrderFunctions: true,
+            allowTypedFunctionExpressions: true
           }],
           '@typescript-eslint/indent': ['error', 2, {
             SwitchCase: 1,

src/index.ts

@@ -42,7 +42,9 @@ export = {
         '@typescript-eslint/adjacent-overload-signatures': 'error',
         '@typescript-eslint/array-type': ['error', 'array-simple'],
         '@typescript-eslint/explicit-function-return-type': ['error', {
-          allowHigherOrderFunctions: true
+          allowExpressions: true,
+          allowHigherOrderFunctions: true,
+          allowTypedFunctionExpressions: true
         }],
         '@typescript-eslint/member-delimiter-style': [
           'error',