hatch-surf/node_modules/eslint/lib/rules/unicode-bom.js
Riley Zhang df378d33ef
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Co-Authored-By: Paperclip <noreply@paperclip.ing>
2026-06-25 05:20:46 +02:00

74 lines
1.7 KiB
JavaScript

/**
* @fileoverview Require or disallow Unicode BOM
* @author Andrew Johnston <https://github.com/ehjay>
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: "layout",
defaultOptions: ["never"],
docs: {
description: "Require or disallow Unicode byte order mark (BOM)",
recommended: false,
url: "https://eslint.org/docs/latest/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.sourceCode,
location = { column: 0, line: 1 };
const [requireBOM] = context.options;
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]);
},
});
}
},
};
},
};