@putout/engine-runner

putout-engine-runner

Run putout plugins.

Install

npm i @putout/engine-runner

Supported Plugin Types

Replacer

Replacer converts code in declarative way. Simplest possible form, no need to use fix. Just from and to parts.

Simplest replace example:

module.exports.report = () => 'any message here';

module.exports.replace = () => {
    'const a = 1': 'const b = 1',
};

// optional
module.exports.filter = () => {
    return true;
}

// optional
module.exports.exclude = () => [
    `const hello = 'world'`,
];

Simplest remove example:

module.exports.report = () => 'debugger should not be used';

module.exports.replace = () => {
    'debugger': '',
};

Templates:

module.exports.report = () => 'any message here';

module.exports.replace = () => {
    'var __a = 1': 'const __a = 1',
};

A couple variables example:

module.exports.report = () => 'any message here';

module.exports.replace = () => {
    'const __a = __b': 'const __b = __a',
};

Includer

includer is the most prefarable format of a plugin, simplest to use (after replacer)

module.exports.report = () => 'debugger statement should not be used';

module.exports.fix = (path) => {
    path.remove();
};

module.exports.include = () => [
    'debugger',
];

// optional
module.exports.exclude = () => {
};

// optional
module.exports.filter = (path) => {
    return true;
};

include and exclude returns an array of @babel/types, or code blocks:

const __ = 'hello';

Where __ can be any node. All this possible with help of @putout/compare. Templates format supported in traverse and find plugins as well.

Traverser

Traverse plugins gives you more power to filter and fix nodes you need.

module.exports.report = () => 'debugger statement should not be used';

module.exports.fix = (path) => {
    path.remove();
};

module.exports.traverse = ({push}) => {
    return {
        'debugger'(path) {
            push(path);
        }
    }
};

Finder

Find plugins gives you all the control over traversing, but it's the slowest format. Because traversers not merged in contrast with other plugin formats.

module.exports.report = () => 'debugger statement should not be used';

module.exports.fix = (path) => {
    path.remove();
};

module.exports.find = (ast, {push, traverse}) => {
    traverse(ast, {
        'debugger'(path) {
            push(path);
        }
    }
};

Example

const {runPlugins} = require('@putout/engine-runner');
const {parse} = require('@putout/engin-parser');

const plugins = [{
    rule: "remove-debugger",
    msg: "",        // optional
    options: {},    // optional
    plugin:
        include: () => ['debugger'],
        fix: (path) => path.remove(),
        report: () => `debugger should not be used`,
}];

const ast = parse('const m = "hi"; debugger');
const places = runPlugins({
    ast,
    shebang: false,     // default
    fix: true,          // default
    fixCount: 1         // default
    plugins,
    parser: 'babel',    // default
});

Logs

To see logs, use:

DEBUG=putout:runner:*
DEBUG=putout:runner:fix
DEBUG=putout:runner:find
DEBUG=putout:runner:template

License

MIT