@fastly/js-compute/dist/esbuild-plugins/swallowTopLevelExportsPlugin.js

JavaScript SDK and CLI for building JavaScript applications on [Fastly Compute](https://www.fastly.com/products/edge-compute/serverless).

import { dirname, isAbsolute, resolve } from 'node:path';
export function swallowTopLevelExportsPlugin(opts) {
    const { entry } = opts ?? {};
    const name = 'swallow-top-level-exports';
    const namespace = 'swallow-top-level';
    if (!entry)
        throw new Error(`[${name}] You must provide opts.entry`);
    // Normalize once so our onResolve comparison is exact.
    const normalizedEntry = resolve(entry);
    return {
        name,
        setup(build) {
            build.onResolve({ filter: /.*/ }, (args) => {
                const maybeEntry = isAbsolute(args.path)
                    ? args.path
                    : resolve(args.resolveDir || process.cwd(), args.path);
                if (args.kind === 'entry-point' && maybeEntry === normalizedEntry) {
                    return { path: normalizedEntry, namespace };
                }
                return null;
            });
            build.onLoad({ filter: /.*/, namespace }, (args) => {
                // Generate a JS wrapper that imports the real entry
                // This swallows the top level exports for the entry file
                // and runs any side effects, such as addEventListener().
                return {
                    contents: `import ${JSON.stringify(args.path)};`,
                    loader: 'js',
                    resolveDir: dirname(args.path),
                };
            });
        },
    };
}