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_config.js
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_config.js
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const assert = require('assert');
module.exports = {
description: 'Generates actual files for virtual modules when preserving modules',
options: {
input: ['main.js'],
preserveModules: true,
plugins: [
{
resolveId(id) {
if (id === '\0virtualModule.js') return id;
},
load(id) {
if (id !== '\0virtualModule.js') return null;
return 'export const virtual = "Virtual!";\n';
},
transform(code, id) {
if (id === '\0virtualModule.js') return null;
return 'import {virtual} from "\0virtualModule.js";\n' + code;
}
}
]
},
bundle(bundle) {
return bundle
.generate({ format: 'esm' })
.then(generated =>
assert.deepEqual(generated.output.map(chunk => chunk.fileName), [
'main.js',
'_virtual/_virtualModule.js',
'_virtual/_virtualModule2.js'
])
);
}
};