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app_vue/node_modules/eslint/lib/rules/unicode-bom.js

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+/**
+ * @fileoverview Require or disallow Unicode BOM
+ * @author Andrew Johnston <https://github.com/ehjay>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "require or disallow Unicode byte order mark (BOM)",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/unicode-bom"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["always", "never"]
+            }
+        ],
+        messages: {
+            expected: "Expected Unicode BOM (Byte Order Mark).",
+            unexpected: "Unexpected Unicode BOM (Byte Order Mark)."
+        }
+    },
+
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+
+            Program: function checkUnicodeBOM(node) {
+
+                const sourceCode = context.getSourceCode(),
+                    location = { column: 0, line: 1 },
+                    requireBOM = context.options[0] || "never";
+
+                if (!sourceCode.hasBOM && (requireBOM === "always")) {
+                    context.report({
+                        node,
+                        loc: location,
+                        messageId: "expected",
+                        fix(fixer) {
+                            return fixer.insertTextBeforeRange([0, 1], "\uFEFF");
+                        }
+                    });
+                } else if (sourceCode.hasBOM && (requireBOM === "never")) {
+                    context.report({
+                        node,
+                        loc: location,
+                        messageId: "unexpected",
+                        fix(fixer) {
+                            return fixer.removeRange([-1, 0]);
+                        }
+                    });
+                }
+            }
+
+        };
+
+    }
+};