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prefer-less-than.ts
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prefer-less-than.ts
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/**
* @license Use of this source code is governed by an MIT-style license that
* can be found in the LICENSE file at https://github.com/cartant/eslint-plugin-etc
*/
import {
TSESLint as eslint,
TSESTree as es,
} from "@typescript-eslint/experimental-utils";
import { ruleCreator } from "../utils";
const rule = ruleCreator({
defaultOptions: [],
meta: {
docs: {
category: "Best Practices",
description: "Forbids greater-than comparisons.",
recommended: false,
},
fixable: "code",
messages: {
forbiddenGT: "Greater-than comparisons are forbidden.",
forbiddenGTE: "Greater-than-or-equal comparisons are forbidden.",
suggestLT: "Use a less-than comparison instead.",
suggestLTE: "Use a less-than-or-equal comparison instead.",
},
schema: [],
type: "suggestion",
},
name: "prefer-less-than",
create: (context) => {
return {
"BinaryExpression[operator=/^(>|>=)$/]": (
expression: es.BinaryExpression
) => {
const gte = expression.operator === ">=";
function fix(fixer: eslint.RuleFixer) {
const { left, right } = expression;
const sourceCode = context.getSourceCode();
const operator = sourceCode.getTokenAfter(left);
return operator
? [
fixer.replaceText(left, sourceCode.getText(right)),
fixer.replaceTextRange(operator.range, gte ? "<=" : "<"),
fixer.replaceText(right, sourceCode.getText(left)),
]
: [];
}
context.report({
fix,
messageId: gte ? "forbiddenGTE" : "forbiddenGT",
node: expression,
suggest: [
{
fix,
messageId: gte ? "suggestLTE" : "suggestLT",
},
],
});
},
};
},
});
export = rule;