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// @flow
import type {
ScopeHoistingPackager,
OutputFormat,
} from './ScopeHoistingPackager';
export class CJSOutputFormat implements OutputFormat {
packager: ScopeHoistingPackager;
constructor(packager: ScopeHoistingPackager) {
this.packager = packager;
}
buildBundlePrelude(): [string, number] {
let res = '';
let lines = 0;
for (let [source, specifiers] of this.packager.externals) {
// CJS only supports the namespace symbol. This ensures that all accesses
// are live and the `this` binding is correct.
let namespace = specifiers.get('*');
if (namespace) {
res += `var ${namespace} = require(${JSON.stringify(source)});\n`;
lines++;
} else {
res += `require(${JSON.stringify(source)});\n`;
lines++;
}
}
if (res.length > 0) {
res += '\n';
lines++;
}
return [res, lines];
}
buildBundlePostlude(): [string, number] {
return ['', 0];
}
}