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home/ags/node_modules/eslint-plugin-es-x/lib/rules/no-trailing-function-commas.js

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+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+const { getSourceCode } = require("eslint-compat-utils")
+const { isCommaToken } = require("../utils")
+
+module.exports = {
+    meta: {
+        docs: {
+            description:
+                "disallow trailing commas in parameter/argument lists.",
+            category: "ES2017",
+            recommended: false,
+            url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-trailing-function-commas.html",
+        },
+        fixable: "code",
+        messages: {
+            forbidden:
+                "ES2017 trailing commas in parameter/argument lists are forbidden.",
+        },
+        schema: [],
+        type: "problem",
+    },
+    create(context) {
+        const sourceCode = getSourceCode(context)
+        return {
+            ":function"(node) {
+                const length = node.params.length
+                if (length === 0) {
+                    return
+                }
+
+                const lastParam = node.params[length - 1]
+                const token = sourceCode.getTokenAfter(lastParam)
+                if (isCommaToken(token)) {
+                    context.report({
+                        loc: token.loc,
+                        messageId: "forbidden",
+                        fix(fixer) {
+                            return fixer.remove(token)
+                        },
+                    })
+                }
+            },
+            "CallExpression, NewExpression"(node) {
+                const token = sourceCode.getLastToken(node, 1)
+                if (node.arguments.length >= 1 && isCommaToken(token)) {
+                    context.report({
+                        loc: token.loc,
+                        messageId: "forbidden",
+                        fix(fixer) {
+                            return fixer.remove(token)
+                        },
+                    })
+                }
+            },
+        }
+    },
+}