72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
"use strict";
|
|
|
|
const selector = [
|
|
"MemberExpression",
|
|
"[computed=true]",
|
|
"[optional=false]",
|
|
'[property.type="BinaryExpression"]',
|
|
'[property.operator="-"]',
|
|
'[property.left.type="MemberExpression"]',
|
|
"[property.left.optional=false]",
|
|
"[property.left.computed=false]",
|
|
'[property.left.property.type="Identifier"]',
|
|
'[property.left.property.name="length"]',
|
|
'[property.right.type="Literal"]',
|
|
`:not(${[
|
|
"AssignmentExpression > .left",
|
|
"UpdateExpression > .argument",
|
|
// Ignore `getPenultimate` and `getLast` function self
|
|
'VariableDeclarator[id.name="getPenultimate"] > ArrowFunctionExpression.init *',
|
|
'VariableDeclarator[id.name="getLast"] > ArrowFunctionExpression.init *',
|
|
].join(", ")})`,
|
|
].join("");
|
|
|
|
const messageId = "consistent-negative-index-access";
|
|
|
|
module.exports = {
|
|
meta: {
|
|
type: "suggestion",
|
|
docs: {
|
|
url: "https://github.com/prettier/prettier/blob/main/scripts/tools/eslint-plugin-prettier-internal-rules/consistent-negative-index-access.js",
|
|
},
|
|
messages: {
|
|
[messageId]: "Prefer `{{method}}(…)` over `…[….length - {{index}}]`.",
|
|
},
|
|
fixable: "code",
|
|
},
|
|
create(context) {
|
|
const sourceCode = context.getSourceCode();
|
|
|
|
return {
|
|
[selector](node) {
|
|
const { value: index } = node.property.right;
|
|
|
|
if (index !== 1 && index !== 2) {
|
|
return;
|
|
}
|
|
|
|
const { object } = node;
|
|
const lengthObject = node.property.left.object;
|
|
|
|
const objectText = sourceCode.getText(object);
|
|
// Simply use text to compare object
|
|
if (sourceCode.getText(lengthObject) !== objectText) {
|
|
return;
|
|
}
|
|
|
|
const method = ["getLast", "getPenultimate"][index - 1];
|
|
|
|
context.report({
|
|
node,
|
|
messageId,
|
|
data: {
|
|
index,
|
|
method,
|
|
},
|
|
fix: (fixer) => fixer.replaceText(node, `${method}(${objectText})`),
|
|
});
|
|
},
|
|
};
|
|
},
|
|
};
|