prefer-string-slice: Remove unsafe autofix for String#substr() (#2427)

Co-authored-by: fisker <lionkay@gmail.com>

Author: axetroy

rules/prefer-string-slice.js

@@ -1,7 +1,6 @@
 'use strict';
 const {getStaticValue} = require('@eslint-community/eslint-utils');
 const {getParenthesizedText, getParenthesizedRange} = require('./utils/parentheses.js');
-const isNumber = require('./utils/is-number.js');
 const {replaceArgument} = require('./fix/index.js');
 const {isNumberLiteral, isMethodCall} = require('./ast/index.js');
 
@@ -64,13 +63,6 @@ function * fixSubstrArguments({node, fixer, context, abort}) {
 		return;
 	}
 
-	if (argumentNodes.every(node => isNumber(node, scope))) {
-		const firstArgumentText = getParenthesizedText(firstArgument, sourceCode);
-
-		yield fixer.insertTextBeforeRange(secondArgumentRange, `${firstArgumentText} + `);
-		return;
-	}
-
 	return abort();
 }
 

test/prefer-string-slice.mjs

@@ -84,12 +84,10 @@ test({
 		},
 		{
 			code: '"foo".substr(bar.length, Math.min(baz, 100))',
-			output: '"foo".slice(bar.length, bar.length + Math.min(baz, 100))',
 			errors: errorsSubstr,
 		},
 		{
 			code: '"foo".substr(1, "abc".length)',
-			output: '"foo".slice(1, 1 + "abc".length)',
 			errors: errorsSubstr,
 		},
 		{
@@ -101,10 +99,6 @@ test({
 				const length = 123;
 				"foo".substr(1, length)
 			`,
-			output: outdent`
-				const length = 123;
-				"foo".slice(1, 1 + length)
-			`,
 			errors: errorsSubstr,
 		},
 		{
@@ -140,10 +134,6 @@ test({
 				const length = 123;
 				"foo".substr(1, length - 4)
 			`,
-			output: outdent`
-				const length = 123;
-				"foo".slice(1, 1 + length - 4)
-			`,
 			errors: errorsSubstr,
 		},
 		{
@@ -326,5 +316,9 @@ test.snapshot({
 		'foo.substring(0, (10, 1))',
 		'foo.substring(0, await 1)',
 		'foo.substring((10, bar))',
+		outdent`
+			const string = "::";
+			const output = string.substr(-2, 2);
+		`,
 	],
 });

test/snapshots/prefer-string-slice.mjs.md

@@ -122,12 +122,6 @@ Generated by [AVA](https://avajs.dev).
       1 | foo.substr((0, bar.length), (0, baz.length))␊
     `
 
-> Output
-
-    `␊
-      1 | foo.slice((0, bar.length), (0, bar.length) + (0, baz.length))␊
-    `
-
 > Error 1/1
 
     `␊
@@ -218,3 +212,20 @@ Generated by [AVA](https://avajs.dev).
     > 1 | foo.substring((10, bar))␊
         | ^^^^^^^^^^^^^^^^^^^^^^^^ Prefer \`String#slice()\` over \`String#substring()\`.␊
     `
+
+## invalid(11): const string = "::"; const output = string.substr(-2, 2);
+
+> Input
+
+    `␊
+      1 | const string = "::";␊
+      2 | const output = string.substr(-2, 2);␊
+    `
+
+> Error 1/1
+
+    `␊
+      1 | const string = "::";␊
+    > 2 | const output = string.substr(-2, 2);␊
+        |                ^^^^^^^^^^^^^^^^^^^^ Prefer \`String#slice()\` over \`String#substr()\`.␊
+    `