@typescript-eslint/eslint-plugin/dist/rules/prefer-literal-enum-member.js

"use strict";
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: 'prefer-literal-enum-member',
    meta: {
        type: 'suggestion',
        docs: {
            description: 'Require that all enum members be literal values to prevent unintended enum member name shadow issues',
            recommended: false,
            requiresTypeChecking: false,
        },
        messages: {
            notLiteral: `Explicit enum value must only be a literal value (string, number, boolean, etc).`,
        },
        schema: [
            {
                type: 'object',
                properties: {
                    allowBitwiseExpressions: {
                        type: 'boolean',
                    },
                },
                additionalProperties: false,
            },
        ],
    },
    defaultOptions: [
        {
            allowBitwiseExpressions: false,
        },
    ],
    create(context, [{ allowBitwiseExpressions }]) {
        return {
            TSEnumMember(node) {
                // If there is no initializer, then this node is just the name of the member, so ignore.
                if (node.initializer == null) {
                    return;
                }
                // any old literal
                if (node.initializer.type === utils_1.AST_NODE_TYPES.Literal) {
                    return;
                }
                // TemplateLiteral without expressions
                if (node.initializer.type === utils_1.AST_NODE_TYPES.TemplateLiteral &&
                    node.initializer.expressions.length === 0) {
                    return;
                }
                // -1 and +1
                if (node.initializer.type === utils_1.AST_NODE_TYPES.UnaryExpression &&
                    node.initializer.argument.type === utils_1.AST_NODE_TYPES.Literal &&
                    (['+', '-'].includes(node.initializer.operator) ||
                        (allowBitwiseExpressions && node.initializer.operator === '~'))) {
                    return;
                }
                if (allowBitwiseExpressions &&
                    node.initializer.type === utils_1.AST_NODE_TYPES.BinaryExpression &&
                    ['|', '&', '^', '<<', '>>', '>>>'].includes(node.initializer.operator) &&
                    node.initializer.left.type === utils_1.AST_NODE_TYPES.Literal &&
                    node.initializer.right.type === utils_1.AST_NODE_TYPES.Literal) {
                    return;
                }
                context.report({
                    node: node.id,
                    messageId: 'notLiteral',
                });
            },
        };
    },
});
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