prevent-abbreviations: Fix inappropriate suggestion (#592)

Author: fisker

rules/prevent-abbreviations.js

@@ -668,6 +668,9 @@ const create = context => {
 		}
 
 		const scopes = variable.references.map(reference => reference.from).concat(variable.scope);
+		variableReplacements.samples = variableReplacements.samples.map(
+			name => avoidCapture(name, scopes, ecmaVersion, isSafeName)
+		);
 
 		const problem = {
 			node: definition.name,
@@ -676,20 +679,19 @@ const create = context => {
 
 		if (variableReplacements.total === 1 && shouldFix(variable)) {
 			const [replacement] = variableReplacements.samples;
-			const captureAvoidingReplacement = avoidCapture(replacement, scopes, ecmaVersion, isSafeName);
 
 			for (const scope of scopes) {
 				if (!scopeToNamesGeneratedByFixer.has(scope)) {
 					scopeToNamesGeneratedByFixer.set(scope, new Set());
 				}
 
 				const generatedNames = scopeToNamesGeneratedByFixer.get(scope);
-				generatedNames.add(captureAvoidingReplacement);
+				generatedNames.add(replacement);
 			}
 
 			problem.fix = fixer => {
 				return variableIdentifiers(variable)
-					.map(fixIdentifier(fixer, captureAvoidingReplacement));
+					.map(fixIdentifier(fixer, replacement));
 			};
 		}
 

test/prevent-abbreviations.js

@@ -775,7 +775,7 @@ ruleTester.run('prevent-abbreviations', rule, {
 		{
 			code: 'class Err {}',
 			output: 'class Error_ {}',
-			errors: createErrors('The variable `Err` should be named `Error`. A more descriptive name will do too.')
+			errors: createErrors('The variable `Err` should be named `Error_`. A more descriptive name will do too.')
 		},
 		{
 			code: 'class Cb {}',
@@ -828,7 +828,40 @@ ruleTester.run('prevent-abbreviations', rule, {
 				"use strict";
 				let package_;
 			`,
-			errors: createErrors()
+			errors: createErrors('The variable `pkg` should be named `package_`. A more descriptive name will do too.')
+		},
+		{
+			code: outdent`
+				"use strict";
+				let pkg = 1;
+				let package_ = 2;
+			`,
+			output: outdent`
+				"use strict";
+				let package__ = 1;
+				let package_ = 2;
+			`,
+			errors: createErrors('The variable `pkg` should be named `package__`. A more descriptive name will do too.')
+		},
+		{
+			code: outdent`
+				"use strict";
+				function foo() {
+					const args = [...arguments];
+					const pkg = 1;
+				}
+			`,
+			output: outdent`
+				"use strict";
+				function foo() {
+					const arguments_ = [...arguments];
+					const package_ = 1;
+				}
+			`,
+			errors: [
+				...createErrors('The variable `args` should be named `arguments_`. A more descriptive name will do too.'),
+				...createErrors('The variable `pkg` should be named `package_`. A more descriptive name will do too.')
+			]
 		},
 
 		{