netlify-lambda/lib/install.js

Build and serve lambda function with webpack compilation

const path = require("path");
const fs = require("fs");
const globby = require("globby");
const cp = require("child_process");
var conf = require("./config");

function installDeps(functionDir, cb) {
  cp.exec("npm i", { cwd: functionDir }, cb);
}

exports.run = async function(dir) {
  let directory;
  if (dir) {
    var dirPath = path.join(process.cwd(), dir);
    directory = dirPath;
  } else {
    var config = conf.load();
    const functionsDir = config.build.functions || config.build.Functions;
    if (!functionsDir) {
      console.log("Error: no functions dir detected.");
    }
    const functionsPath = path.join(process.cwd(), functionsDir);
    directory = functionsPath;
  }

  const findJSFiles = ["*/package.json", "!node_modules", "!**/node_modules"];
  const foldersWithDeps = await globby(findJSFiles, { cwd: directory });

  const folders = foldersWithDeps
    .map(fnFolder => {
      return fnFolder.substring(0, fnFolder.indexOf("package.json"));
    })
    .map(folder => {
      installDeps(path.join(directory, folder), () => {
        console.log(`${folder} dependencies installed`);
      });
    });
};