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84 lines
3.1 KiB
Plaintext
84 lines
3.1 KiB
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const utils_1 = require("@typescript-eslint/utils");
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const util_1 = require("../util");
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exports.default = (0, util_1.createRule)({
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name: 'no-duplicate-enum-values',
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meta: {
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type: 'problem',
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docs: {
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description: 'Disallow duplicate enum member values',
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recommended: 'recommended',
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},
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hasSuggestions: false,
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messages: {
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duplicateValue: 'Duplicate enum member value {{value}}.',
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},
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schema: [],
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},
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defaultOptions: [],
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create(context) {
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function isStringLiteral(node) {
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return (node.type === utils_1.AST_NODE_TYPES.Literal && typeof node.value === 'string');
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}
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function isNumberLiteral(node) {
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return (node.type === utils_1.AST_NODE_TYPES.Literal && typeof node.value === 'number');
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}
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function isSupportedUnary(node) {
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return (node.type === utils_1.AST_NODE_TYPES.UnaryExpression &&
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['-', '+'].includes(node.operator));
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}
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function isStaticTemplateLiteral(node) {
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return (node.type === utils_1.AST_NODE_TYPES.TemplateLiteral &&
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node.expressions.length === 0 &&
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node.quasis.length === 1);
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}
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function getMemberValue(initializer) {
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switch (true) {
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case isStringLiteral(initializer):
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case isNumberLiteral(initializer):
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return initializer.value;
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case isSupportedUnary(initializer): {
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const inner = Number(getMemberValue(initializer.argument));
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if (Number.isNaN(inner)) {
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return undefined;
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}
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return initializer.operator === '-' ? -inner : inner;
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}
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case isStaticTemplateLiteral(initializer):
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return initializer.quasis[0].value.cooked;
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default:
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return undefined;
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}
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}
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return {
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TSEnumDeclaration(node) {
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const enumMembers = node.body.members;
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const seenValues = [];
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enumMembers.forEach(member => {
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if (member.initializer == null) {
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return;
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}
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const value = getMemberValue(member.initializer);
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if (value == null) {
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return;
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}
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const isAlreadyPresent = seenValues.some(seenValue => Object.is(seenValue, value));
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if (isAlreadyPresent) {
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context.report({
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node: member,
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messageId: 'duplicateValue',
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data: {
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value,
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},
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});
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}
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else {
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seenValues.push(value);
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}
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});
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},
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};
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},
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});
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