@masknet/eslint-plugin/lib/rules/prefer-early-return.js

eslint plugin for masknet

import { isFunctionLike } from "../node.js";
import { createRule } from "../rule.js";
import { wrap } from "../utils.js";
export default createRule({
    name: 'prefer-early-return',
    meta: {
        type: 'problem',
        fixable: 'code',
        docs: {
            description: 'Prefer early returns over full-body conditional wrapping in function declarations',
            recommended: 'stylistic',
        },
        schema: [
            {
                type: 'object',
                properties: { maximumStatements: { type: 'integer', minimum: 0 } },
                additionalProperties: false,
            },
        ],
        messages: {
            prefer: 'Prefer an early return to a conditionally-wrapped function body',
        },
    },
    defaultOptions: [{ maximumStatements: 0 }],
    create(context, [{ maximumStatements }]) {
        function handle({ body, parent }) {
            if (!isFunctionLike(parent))
                return;
            // cspell:words simplifiable
            const simplifiable = body.length === 1 && isOffending(body[0], maximumStatements);
            if (!simplifiable)
                return;
            const fix = makeFixer(context, body[0]);
            context.report({ node: body[0], messageId: 'prefer', fix });
        }
        return {
            BlockStatement: handle,
        };
    },
});
function makeFixer(context, parent) {
    return function* (fixer) {
        if (parent.type !== 'IfStatement')
            return;
        const { test, consequent } = parent;
        yield fixer.insertTextBefore(test, '!(');
        yield fixer.insertTextAfter(test, ')');
        yield fixer.replaceText(consequent, 'return;');
        const modified = wrap(context.sourceCode.getText(consequent), (input) => consequent.type === 'BlockStatement' ? input.slice(1, -1) : input);
        yield fixer.insertTextAfter(parent, modified);
    };
}
function isOffending(node, maximumStatements) {
    if (!(node.type === 'IfStatement' && node.alternate === null)) {
        return false;
    }
    const { consequent } = node;
    return ((consequent.type === 'ExpressionStatement' && maximumStatements === 0) ||
        (consequent.type === 'BlockStatement' && consequent.body.length > maximumStatements));
}
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