Update: Add automated suggestion to radix rule for parsing decimals (#14291)

bmish · web-flow · commit f071d1ef9128 · 2021-04-30T18:48:09.000-04:00
diff --git a/lib/rules/radix.js b/lib/rules/radix.js
@@ -82,7 +82,8 @@ module.exports = {
             description: "enforce the consistent use of the radix argument when using `parseInt()`",
             category: "Best Practices",
             recommended: false,
-            url: "https://eslint.org/docs/rules/radix"
+            url: "https://eslint.org/docs/rules/radix",
+            suggestion: true
         },
 
         schema: [
@@ -95,7 +96,8 @@ module.exports = {
             missingParameters: "Missing parameters.",
             redundantRadix: "Redundant radix parameter.",
             missingRadix: "Missing radix parameter.",
-            invalidRadix: "Invalid radix parameter, must be an integer between 2 and 36."
+            invalidRadix: "Invalid radix parameter, must be an integer between 2 and 36.",
+            addRadixParameter10: "Add radix parameter `10` for parsing decimal numbers."
         }
     },
 
@@ -123,7 +125,21 @@ module.exports = {
                     if (mode === MODE_ALWAYS) {
                         context.report({
                             node,
-                            messageId: "missingRadix"
+                            messageId: "missingRadix",
+                            suggest: [
+                                {
+                                    messageId: "addRadixParameter10",
+                                    fix(fixer) {
+                                        const sourceCode = context.getSourceCode();
+                                        const tokens = sourceCode.getTokens(node);
+                                        const lastToken = tokens[tokens.length - 1]; // Parenthesis.
+                                        const secondToLastToken = tokens[tokens.length - 2]; // May or may not be a comma.
+                                        const hasTrailingComma = secondToLastToken.type === "Punctuator" && secondToLastToken.value === ",";
+
+                                        return fixer.insertTextBefore(lastToken, hasTrailingComma ? " 10," : ", 10");
+                                    }
+                                }
+                            ]
                         });
                     }
                     break;
diff --git a/tests/lib/rules/radix.js b/tests/lib/rules/radix.js
@@ -76,7 +76,34 @@ ruleTester.run("radix", rule, {
             code: "parseInt(\"10\");",
             errors: [{
                 messageId: "missingRadix",
-                type: "CallExpression"
+                type: "CallExpression",
+                suggestions: [{ messageId: "addRadixParameter10", output: "parseInt(\"10\", 10);" }]
+            }]
+        },
+        {
+            code: "parseInt(\"10\",);", // Function parameter with trailing comma
+            parserOptions: { ecmaVersion: 2017 },
+            errors: [{
+                messageId: "missingRadix",
+                type: "CallExpression",
+                suggestions: [{ messageId: "addRadixParameter10", output: "parseInt(\"10\", 10,);" }]
+            }]
+        },
+        {
+            code: "parseInt((0, \"10\"));", // Sequence expression (no trailing comma).
+            errors: [{
+                messageId: "missingRadix",
+                type: "CallExpression",
+                suggestions: [{ messageId: "addRadixParameter10", output: "parseInt((0, \"10\"), 10);" }]
+            }]
+        },
+        {
+            code: "parseInt((0, \"10\"),);", // Sequence expression (with trailing comma).
+            parserOptions: { ecmaVersion: 2017 },
+            errors: [{
+                messageId: "missingRadix",
+                type: "CallExpression",
+                suggestions: [{ messageId: "addRadixParameter10", output: "parseInt((0, \"10\"), 10,);" }]
             }]
         },
         {
@@ -154,7 +181,8 @@ ruleTester.run("radix", rule, {
             code: "Number.parseInt(\"10\");",
             errors: [{
                 messageId: "missingRadix",
-                type: "CallExpression"
+                type: "CallExpression",
+                suggestions: [{ messageId: "addRadixParameter10", output: "Number.parseInt(\"10\", 10);" }]
             }]
         },
         {
@@ -191,22 +219,46 @@ ruleTester.run("radix", rule, {
         {
             code: "parseInt?.(\"10\");",
             parserOptions: { ecmaVersion: 2020 },
-            errors: [{ messageId: "missingRadix" }]
+            errors: [
+                {
+                    messageId: "missingRadix",
+                    type: "CallExpression",
+                    suggestions: [{ messageId: "addRadixParameter10", output: "parseInt?.(\"10\", 10);" }]
+                }
+            ]
         },
         {
             code: "Number.parseInt?.(\"10\");",
             parserOptions: { ecmaVersion: 2020 },
-            errors: [{ messageId: "missingRadix" }]
+            errors: [
+                {
+                    messageId: "missingRadix",
+                    type: "CallExpression",
+                    suggestions: [{ messageId: "addRadixParameter10", output: "Number.parseInt?.(\"10\", 10);" }]
+                }
+            ]
         },
         {
             code: "Number?.parseInt(\"10\");",
             parserOptions: { ecmaVersion: 2020 },
-            errors: [{ messageId: "missingRadix" }]
+            errors: [
+                {
+                    messageId: "missingRadix",
+                    type: "CallExpression",
+                    suggestions: [{ messageId: "addRadixParameter10", output: "Number?.parseInt(\"10\", 10);" }]
+                }
+            ]
         },
         {
             code: "(Number?.parseInt)(\"10\");",
             parserOptions: { ecmaVersion: 2020 },
-            errors: [{ messageId: "missingRadix" }]
+            errors: [
+                {
+                    messageId: "missingRadix",
+                    type: "CallExpression",
+                    suggestions: [{ messageId: "addRadixParameter10", output: "(Number?.parseInt)(\"10\", 10);" }]
+                }
+            ]
         }
     ]
 });
