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qwen/nodejs/node_modules/eslint/lib/rules/eol-last.js

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+/**
+ * @fileoverview Require or disallow newline at the end of files
+ * @author Nodeca Team <https://github.com/nodeca>
+ * @deprecated in ESLint v8.53.0
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../shared/types').Rule} */
+module.exports = {
+    meta: {
+        deprecated: true,
+        replacedBy: [],
+        type: "layout",
+
+        docs: {
+            description: "Require or disallow newline at the end of files",
+            recommended: false,
+            url: "https://eslint.org/docs/latest/rules/eol-last"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                enum: ["always", "never", "unix", "windows"]
+            }
+        ],
+
+        messages: {
+            missing: "Newline required at end of file but not found.",
+            unexpected: "Newline not allowed at end of file."
+        }
+    },
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            Program: function checkBadEOF(node) {
+                const sourceCode = context.sourceCode,
+                    src = sourceCode.getText(),
+                    lastLine = sourceCode.lines[sourceCode.lines.length - 1],
+                    location = {
+                        column: lastLine.length,
+                        line: sourceCode.lines.length
+                    },
+                    LF = "\n",
+                    CRLF = `\r${LF}`,
+                    endsWithNewline = src.endsWith(LF);
+
+                /*
+                 * Empty source is always valid: No content in file so we don't
+                 * need to lint for a newline on the last line of content.
+                 */
+                if (!src.length) {
+                    return;
+                }
+
+                let mode = context.options[0] || "always",
+                    appendCRLF = false;
+
+                if (mode === "unix") {
+
+                    // `"unix"` should behave exactly as `"always"`
+                    mode = "always";
+                }
+                if (mode === "windows") {
+
+                    // `"windows"` should behave exactly as `"always"`, but append CRLF in the fixer for backwards compatibility
+                    mode = "always";
+                    appendCRLF = true;
+                }
+                if (mode === "always" && !endsWithNewline) {
+
+                    // File is not newline-terminated, but should be
+                    context.report({
+                        node,
+                        loc: location,
+                        messageId: "missing",
+                        fix(fixer) {
+                            return fixer.insertTextAfterRange([0, src.length], appendCRLF ? CRLF : LF);
+                        }
+                    });
+                } else if (mode === "never" && endsWithNewline) {
+
+                    const secondLastLine = sourceCode.lines[sourceCode.lines.length - 2];
+
+                    // File is newline-terminated, but shouldn't be
+                    context.report({
+                        node,
+                        loc: {
+                            start: { line: sourceCode.lines.length - 1, column: secondLastLine.length },
+                            end: { line: sourceCode.lines.length, column: 0 }
+                        },
+                        messageId: "unexpected",
+                        fix(fixer) {
+                            const finalEOLs = /(?:\r?\n)+$/u,
+                                match = finalEOLs.exec(sourceCode.text),
+                                start = match.index,
+                                end = sourceCode.text.length;
+
+                            return fixer.replaceTextRange([start, end], "");
+                        }
+                    });
+                }
+            }
+        };
+    }
+};