@typescript-eslint/eslint-plugin
Version:
TypeScript plugin for ESLint
68 lines (67 loc) • 2.53 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("@typescript-eslint/utils");
const util_1 = require("../util");
exports.default = (0, util_1.createRule)({
name: 'default-param-last',
meta: {
type: 'suggestion',
docs: {
description: 'Enforce default parameters to be last',
extendsBaseRule: true,
},
messages: {
shouldBeLast: 'Default parameters should be last.',
},
schema: [],
},
defaultOptions: [],
create(context) {
/**
* checks if node is optional parameter
* @param node the node to be evaluated
* @private
*/
function isOptionalParam(node) {
return ((node.type === utils_1.AST_NODE_TYPES.ArrayPattern ||
node.type === utils_1.AST_NODE_TYPES.AssignmentPattern ||
node.type === utils_1.AST_NODE_TYPES.Identifier ||
node.type === utils_1.AST_NODE_TYPES.ObjectPattern ||
node.type === utils_1.AST_NODE_TYPES.RestElement) &&
node.optional);
}
/**
* checks if node is plain parameter
* @param node the node to be evaluated
* @private
*/
function isPlainParam(node) {
return !(node.type === utils_1.AST_NODE_TYPES.AssignmentPattern ||
node.type === utils_1.AST_NODE_TYPES.RestElement ||
isOptionalParam(node));
}
function checkDefaultParamLast(node) {
let hasSeenPlainParam = false;
for (let i = node.params.length - 1; i >= 0; i--) {
const current = node.params[i];
const param = current.type === utils_1.AST_NODE_TYPES.TSParameterProperty
? current.parameter
: current;
if (isPlainParam(param)) {
hasSeenPlainParam = true;
continue;
}
if (hasSeenPlainParam &&
(isOptionalParam(param) ||
param.type === utils_1.AST_NODE_TYPES.AssignmentPattern)) {
context.report({ node: current, messageId: 'shouldBeLast' });
}
}
}
return {
ArrowFunctionExpression: checkDefaultParamLast,
FunctionDeclaration: checkDefaultParamLast,
FunctionExpression: checkDefaultParamLast,
};
},
});