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/**
* @license
* Copyright 2021 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const path = require('path');
const fs = require('mz/fs');
async function main() {
const entryPoints = require('./entrypoints.json');
for (const entryPoint in entryPoints) {
const info = entryPoints[entryPoint];
if (info.legacy) {
continue;
}
await generateEsmWrapper(entryPoint, info.dist);
}
}
async function generateEsmWrapper(entryPoint, source) {
console.log(`Generating ESM wrapper for ${entryPoint}`);
const target = getTarget(entryPoint);
const output = getEsmOutput(source, target);
await fs.mkdir(path.dirname(target), { recursive: true });
await fs.writeFile(target, output);
await fs.writeFile('./lib/esm/package.json', JSON.stringify({type: 'module'}));
}
function getTarget(entryPoint) {
const child = entryPoint.replace('firebase-admin/', '');
return `./lib/esm/${child}/index.js`;
}
function getEsmOutput(source, target) {
const sourcePath = path.resolve(source);
const cjsSource = require.resolve(sourcePath);
const keys = getExports(cjsSource);
const targetPath = path.resolve(target);
const importPath = getImportPath(targetPath, cjsSource);
let output = `import mod from ${JSON.stringify(importPath)};`;
output += '\n\n';
for (const key of keys) {
output += `export const ${key} = mod.${key};\n`;
}
return output;
}
function getImportPath(from, to) {
const fromDir = path.dirname(from);
return path.relative(fromDir, to).replace(/\\/g, '/');
}
function getExports(cjsSource) {
const mod = require(cjsSource);
const keys = new Set(Object.getOwnPropertyNames(mod));
keys.delete('__esModule');
return [...keys].sort();
}
(async () => {
try {
await main();
} catch (err) {
console.log(err);
process.exit(1);
}
})();