@maniascript/mslint/dist/lib/rules/no-unused-expression.js

ManiaScript linter

import {} from '../linter/rule.js';
import { ExpressionStatement, Kind, DotAccessExpression } from '@maniascript/parser';
export const noUnusedExpression = {
    meta: {
        id: 'no-unused-expression',
        description: 'Forbid unused expression',
        recommended: true
    },
    create(context) {
        function isForbidden(expression) {
            if (expression instanceof DotAccessExpression) {
                return (expression.functionCall === undefined &&
                    isForbidden(expression.object));
            }
            else {
                return expression.kind !== Kind.FunctionCallExpression;
            }
        }
        return {
            'ExpressionStatement:enter': (node) => {
                if (node instanceof ExpressionStatement && isForbidden(node.expression)) {
                    context.report(node, 'Expected an assignement or function call and instead found an expression');
                }
            }
        };
    }
};