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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]);
| }
| });
| }
| }
|
| };
|
| }
| };
|
|
