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execution-order.js
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execution-order.js
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import test from 'ava';
import MockSystem from './_mock-module-system';
// Transform that just appends some text
function append(message) {
return code => code + ' ' + message;
}
test.beforeEach(t => {
t.context = new MockSystem({
'/foo.js': 'foo'
});
});
test('conventional transforms are applied in the order installed', t => {
const system = t.context;
system.installConventionalTransform(append('a'));
system.installConventionalTransform(append('b'));
const module = system.load('/foo.js');
t.is(module.code, 'foo a b');
});
test('wrapped transforms are applied last, even when conventional transforms are added later', t => {
const system = t.context;
system.appendTransform(append('always-last'));
system.installConventionalTransform((append('b')));
const module = system.load('/foo.js');
t.is(module.code, 'foo b always-last');
});
test('wrapped transforms get applied after the conventional transforms they replace', t => {
const system = t.context;
system.installConventionalTransform(append('a'));
system.appendTransform(append('b'));
const module = system.load('/foo.js');
t.is(module.code, 'foo a b');
});
test('multiple wrapped transforms can be installed on top of each other, they are applied in reverse order (first installed is applied last)', t => {
const system = t.context;
system.appendTransform(append('a'));
system.appendTransform(append('b'));
const module = system.load('/foo.js');
t.is(module.code, 'foo b a');
});