eslint-plugin-mocha/rules/no-setup-in-describe.js

Eslint rules for mocha.

import { createMochaVisitors } from '../ast/mocha-visitors.js';
import { isSuiteConfigCall } from '../mocha/config-call.js';
const FUNCTION = 1;
const DESCRIBE = 2;
const PURE = 3;
function isNestedInDescribeBlock(nesting) {
    return (nesting.length > 0 &&
        !nesting.includes(PURE) &&
        nesting.lastIndexOf(FUNCTION) < nesting.lastIndexOf(DESCRIBE));
}
function reportCallExpression(context, callExpression) {
    const message = 'Unexpected function call in describe block.';
    context.report({
        message,
        node: callExpression.callee
    });
}
function reportMemberExpression(context, memberExpression) {
    const message = 'Unexpected member expression in describe block. ' +
        'Member expressions may call functions via getters.';
    context.report({
        message,
        node: memberExpression
    });
}
export const noSetupInDescribeRule = {
    meta: {
        type: 'suggestion',
        docs: {
            description: 'Disallow setup in describe blocks',
            url: 'https://github.com/lo1tuma/eslint-plugin-mocha/blob/main/docs/rules/no-setup-in-describe.md'
        },
        schema: []
    },
    create(context) {
        const nesting = [];
        const suiteNodes = new WeakSet();
        function handleCallExpressionInDescribe(node) {
            if (isSuiteConfigCall(node)) {
                nesting.push(PURE);
            }
            else if (isNestedInDescribeBlock(nesting)) {
                reportCallExpression(context, node);
            }
        }
        return createMochaVisitors(context, {
            suite(visitorContext) {
                nesting.push(DESCRIBE);
                suiteNodes.add(visitorContext.node);
            },
            'suite:exit'() {
                nesting.pop();
            },
            nonMochaCallExpression(node) {
                if (nesting.length === 0) {
                    return;
                }
                handleCallExpressionInDescribe(node);
            },
            nonMochaMemberExpression(node) {
                if (!suiteNodes.has(node.parent) &&
                    isNestedInDescribeBlock(nesting)) {
                    reportMemberExpression(context, node);
                }
            },
            FunctionDeclaration() {
                if (nesting.length > 0) {
                    nesting.push(FUNCTION);
                }
            },
            'FunctionDeclaration:exit'() {
                if (nesting.length > 0) {
                    nesting.pop();
                }
            },
            FunctionExpression(node) {
                if (nesting.length > 0 && !suiteNodes.has(node.parent)) {
                    nesting.push(FUNCTION);
                }
            },
            'FunctionExpression:exit'(node) {
                if (nesting.length > 0 && !suiteNodes.has(node.parent)) {
                    nesting.pop();
                }
            },
            ArrowFunctionExpression(node) {
                if (nesting.length > 0 && !suiteNodes.has(node.parent)) {
                    nesting.push(FUNCTION);
                }
            },
            'ArrowFunctionExpression:exit'(node) {
                if (nesting.length > 0 && !suiteNodes.has(node.parent)) {
                    nesting.pop();
                }
            }
        });
    }
};
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