eslint-plugin-putout/lib/remove-empty-newline-between-declarations/index.js

ESLint plugin for 🐊Putout

import {types} from 'putout';

const {isObjectPattern} = types;

export default {
    meta: {
        type: 'suggestion',
        docs: {
            description: 'Remove newline between declarations',
            category: 'putout',
            recommended: true,
        },
        fixable: 'code',
    },
    
    create(context) {
        return {
            VariableDeclaration(node) {
                const {sourceCode} = context;
                const text = sourceCode.getText(node);
                
                const newline = sourceCode
                    .getText(node, 0, 2)
                    .replace(text, '');
                
                if (newline !== '\n\n')
                    return;
                
                const nextNode = sourceCode.getNodeByRangeIndex(node.range[1] + 2);
                
                if (!nextNode || nextNode.type !== 'VariableDeclaration')
                    return;
                
                const nodeId = node.declarations[0].id;
                
                if (!isObjectPattern(nodeId))
                    return;
                
                if (nodeId.properties.length !== 1)
                    return;
                
                const textId = sourceCode.getText(nodeId.properties[0].value);
                
                const nextNodeInit = nextNode.declarations[0].init;
                const nextTextInit = sourceCode.getText(nextNodeInit);
                
                if (textId !== nextTextInit)
                    return;
                
                context.report({
                    node,
                    message: 'Remove empty newline between declarations',
                    
                    fix(fixer) {
                        return [
                            fixer.removeRange([
                                node.range[1],
                                node.range[1] + 1,
                            ]),
                        ];
                    },
                });
            },
        };
    },
};