karma-parcel
v0.7.3
Published
Parcel tests to Karma
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Karma Parcel
Use parcel v2 to preprocess karma tests
Notice: v0.7
or newer of this plugin supports parcel@2
and karma@6
. If for whatever
reason you need to make use of parcel-bundler@1
(or parcel@1
), please use [email protected]
Install
To get all the needed packages:
npm i karma parcel karma-parcel -D
Configure:
Add parcel
to the frameworks to be used and to the files that should be preprocessed with it:
module.exports = function (config) {
config.set({
frameworks: ["mocha", "parcel"],
// add patterns with all your tests even if they should not
// be handled by parcel
files: [
"tests/**/*.js",
{
// parcel tests should not be watched. Parcel will do the
// watching instead
pattern: "parcel/**/*.js",
watched: false,
included: false,
},
],
// let karma know which of the test files should be bundled
// with parcel
preprocessors: {
"parcel/*": ["parcel"],
},
});
};
parcelConfig
some more parcel specific configuration can be passed to the underlying parcel
instance via the parcelConfig
attribute of your karma configuration:
module.exports = function (config) {
config.set({
// lot of karma configuration
parcelConfig: {
cacheDir: "/path/to/cache", // default: "./.cache"
detailedReport: true, // default: false,
logLevel: "verbose",
},
});
};
karmaParcelWorkspace
make use of this in order to define a workspace other than current directory:
module.exports = function (config) {
config.set({
// ... lot of karma configuration
// use /tmp/foo/bar as the workspace
karmaParcelWorkspace: path.join(os.tmpdir(), "foo", "bar"),
parcelConfig: { /* the parcel config*/ },
});
};
Under the hood
Parcel will create one bundle with all the files that are preprocessed with
the parcel
preprocessor. The preprocessor will emit an empty file instead of
the actual content. The plugin will register a bundle file to karma's
fileList with serve: false
in order not to be handled by karma's middleware.
To serve the bundled file, parcel's own middleware is registered and used
Related
This plugin is heavily inspired by karma-browserify
and
karma-webpack
.