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chai-jscodeshift
Advanced tools
chai-jscodeshift provides a custom assertion for jscodeshift to check whether a given input fixture matches an output fixture after being transformed by the transformer under test.
import chai from 'chai';
import chaiJSCodeShift from 'chai-jscodeshift';
chai.use(chaiJSCodeShift());
import myTransform from '../src/my-transform';
describe('myTransform', () => {
it('transforms properly', () => {
expect(myTransform).to.transform('my-fixture');
// or
assert.transforms(myTransform, 'my-fixture');
});
});
By default, this plugin will look for fixtures in the fixtures in the working directory. You will probably want to customize this by setting the directory in which your fixtures appear:
import path from 'path';
chai.use(chaiJSCodeShift({
fixtureDirectory: path.join(__dirname, 'fixtures')
}));
When you declare that you want a transformer to transform a particular fixture, this plugin will look for a file named <fixtureName>.input.js
, relative to the fixtureDirectory
declared above. It will read this file, transform the contents using your transformer, and compare it against a file named <fixtureName>.output.js
relative to the fixture directory. You can customize either of these paths by passing a custom inputFixturePath
or outputFixturePath
in your options (both of which take two arguments, the fixture name and the root of the fixture directory):
chai.use(chaiJSCodeShift({
fixtureDirectory: path.join(__dirname, 'fixtures'),
inputFixturePath(fixtureName, fixtureDirectory) {
return path.join(fixtureDirectory, 'input', `${fixtureName}.js`);
},
inputFixturePath(fixtureName, fixtureDirectory) {
return path.join(fixtureDirectory, 'output', `${fixtureName}.js`);
},
}));
You can also set custom options that will be passed as the third argument to your transformer on every call using the transformOptions
configuration option:
chai.use(chaiJSCodeShift({
transformOptions: {
printOptions: {space: 'single'},
},
}));
FAQs
Chai assertion utilities for writing JSCodeShift Codemods.
We found that chai-jscodeshift demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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