Why
Cloud Function for Firebase has node v6.11.x. It's too old for node.js developer and anyway we need our own build stack. For example, I'm babel and flow user.
In addition, in isomorphic environment like SSR, packages are expected same version. So I think bundling all source into one script is most easy solution to publish.
How to build
My project dirs.
package.json
firebase.json
functions/
_dist/ # generated by webpack
index.js
package.json
index.js # entry point
webpack.config.js
// functions/webpack.config.js
const pkg = require('../package')
const GenerateJsonPlugin = require('generate-json-webpack-plugin')
// Set externals that you don't want to build by webpack
const externals = [
'firebase-admin',
'firebase-functions'
]
const genPackage = () => ({
name: 'functions',
private: true,
main: 'index.js',
license: 'MIT',
dependencies: externals.reduce(
(acc, name) =>
Object.assign({}, acc, {
[name]:
pkg.dependencies[name] ||
pkg.devDependencies[name]
}),
{}
)
})
module.exports = {
entry: [__dirname + '/index.js'],
output: {
path: __dirname + '/_dist',
filename: 'index.js',
libraryTarget: 'commonjs'
},
module: {
rules: [
{
test: /\.js$/,
use: 'babel-loader',
exclude: /node_modules/
}
]
},
externals: externals.reduce(
(acc, name) => Object.assign({}, acc, { [name]: true }),
{}
),
plugins: [new GenerateJsonPlugin('package.json', genPackage())]
}
This webpack build functions/_dist/*.
Write your firebase.json
{
"functions": {
"source": "functions/_dist"
},
"hosting": {
"rewrites": [
{
"source": "/api/hello",
"function": "hello"
}
]
}
}
Let's build and deploy.
$ npm i -g firebase-tools webpack
$ webpack --config functions/webpack.config.js
$ cd functions/_dist/; npm install
$ firebase deploy only functions
You can add this task as npm scripts.
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