fix(eslint-plugin): [strict-boolean-expressions] replace dangerous fixer with suggestions (#7394)

* fix(eslint-plugin): remove explicit rule check for logical negation expressions

* feat: add null check error without fix options

* refactor: add explicit null check rule suggestion

* feat: change suggestion fix message id

* test: add fix compare nullish suggestion

* refactor: move !nullableObject to suggestions

Author: kemilbeltre

packages/eslint-plugin/src/rules/strict-boolean-expressions.ts

@@ -703,23 +703,33 @@ export default util.createRule<Options, MessageId>({
             context.report({
               node,
               messageId: 'conditionErrorNullableObject',
-              fix: util.getWrappingFixer({
-                sourceCode,
-                node: node.parent,
-                innerNode: node,
-                wrap: code => `${code} == null`,
-              }),
+              suggest: [
+                {
+                  messageId: 'conditionFixCompareNullish',
+                  fix: util.getWrappingFixer({
+                    sourceCode,
+                    node: node.parent,
+                    innerNode: node,
+                    wrap: code => `${code} == null`,
+                  }),
+                },
+              ],
             });
           } else {
             // if (nullableObject)
             context.report({
               node,
               messageId: 'conditionErrorNullableObject',
-              fix: util.getWrappingFixer({
-                sourceCode,
-                node,
-                wrap: code => `${code} != null`,
-              }),
+              suggest: [
+                {
+                  messageId: 'conditionFixCompareNullish',
+                  fix: util.getWrappingFixer({
+                    sourceCode,
+                    node,
+                    wrap: code => `${code} != null`,
+                  }),
+                },
+              ],
             });
           }
         }

packages/eslint-plugin/tests/rules/strict-boolean-expressions.test.ts

@@ -1008,15 +1008,40 @@ if (y) {
         <T extends {} | null | undefined>(x: T) => x ? 1 : 0;
       `,
       errors: [
-        { messageId: 'conditionErrorNullableObject', line: 2, column: 37 },
-        { messageId: 'conditionErrorNullableObject', line: 3, column: 33 },
-        { messageId: 'conditionErrorNullableObject', line: 4, column: 52 },
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 2,
+          column: 37,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: 'declare const x: object | null; if (x != null) {}',
+            },
+          ],
+        },
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 3,
+          column: 33,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: `        (x?: { a: number }) => x == null;`,
+            },
+          ],
+        },
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 4,
+          column: 52,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: `        <T extends {} | null | undefined>(x: T) => (x != null) ? 1 : 0;`,
+            },
+          ],
+        },
       ],
-      output: `
-        declare const x: object | null; if (x != null) {}
-        (x?: { a: number }) => x == null;
-        <T extends {} | null | undefined>(x: T) => (x != null) ? 1 : 0;
-      `,
     }),
 
     // nullable string in boolean context
@@ -1620,18 +1645,75 @@ if (x) {
         obj && 1 || 0
       `,
       errors: [
-        { messageId: 'conditionErrorNullableObject', line: 3, column: 10 },
-        { messageId: 'conditionErrorNullableObject', line: 4, column: 10 },
-        { messageId: 'conditionErrorNullableObject', line: 5, column: 9 },
-        { messageId: 'conditionErrorNullableObject', line: 6, column: 9 },
-      ],
-      output: `
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 3,
+          column: 10,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: `
         declare const obj: { x: number } | null;
         (obj == null) ? 1 : 0
+        !obj
+        obj || 0
+        obj && 1 || 0
+      `,
+            },
+          ],
+        },
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 4,
+          column: 10,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: `
+        declare const obj: { x: number } | null;
+        !obj ? 1 : 0
         obj == null
+        obj || 0
+        obj && 1 || 0
+      `,
+            },
+          ],
+        },
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 5,
+          column: 9,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: `
+        declare const obj: { x: number } | null;
+        !obj ? 1 : 0
+        !obj
         ;(obj != null) || 0
+        obj && 1 || 0
+      `,
+            },
+          ],
+        },
+        {
+          messageId: 'conditionErrorNullableObject',
+          line: 6,
+          column: 9,
+          suggestions: [
+            {
+              messageId: 'conditionFixCompareNullish',
+              output: `
+        declare const obj: { x: number } | null;
+        !obj ? 1 : 0
+        !obj
+        obj || 0
         ;(obj != null) && 1 || 0
       `,
+            },
+          ],
+        },
+      ],
     },
   ],
 });