@typescript-eslint/eslint-plugin
Version:
TypeScript plugin for ESLint
70 lines (69 loc) • 2.57 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: 'no-duplicate-enum-values',
meta: {
type: 'problem',
docs: {
description: 'Disallow duplicate enum member values',
recommended: 'recommended',
},
hasSuggestions: false,
messages: {
duplicateValue: 'Duplicate enum member value {{value}}.',
},
schema: [],
},
defaultOptions: [],
create(context) {
function isStringLiteral(node) {
return (node.type === utils_1.AST_NODE_TYPES.Literal && typeof node.value === 'string');
}
function isNumberLiteral(node) {
return (node.type === utils_1.AST_NODE_TYPES.Literal && typeof node.value === 'number');
}
function isStaticTemplateLiteral(node) {
return (node.type === utils_1.AST_NODE_TYPES.TemplateLiteral &&
node.expressions.length === 0 &&
node.quasis.length === 1);
}
return {
TSEnumDeclaration(node) {
const enumMembers = node.body.members;
const seenValues = new Set();
enumMembers.forEach(member => {
if (member.initializer == null) {
return;
}
let value;
if (isStringLiteral(member.initializer)) {
value = String(member.initializer.value);
}
else if (isNumberLiteral(member.initializer)) {
value = Number(member.initializer.value);
}
else if (isStaticTemplateLiteral(member.initializer)) {
value = member.initializer.quasis[0].value.cooked;
}
if (value == null) {
return;
}
if (seenValues.has(value)) {
context.report({
node: member,
messageId: 'duplicateValue',
data: {
value,
},
});
}
else {
seenValues.add(value);
}
});
},
};
},
});