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