Error when using pdfkit: "Error: ENOENT: no such file or directory, open '//data.trie'"

I am trying to switch from serverless-webpack to serverless-bundle, but I cannot get it to work with pdfkit. I get the following error when trying to invoke my lambda:

Serverless: Bundling with Webpack...
{ Error: ENOENT: no such file or directory, open '//data.trie'
    at Object.openSync (fs.js:438:3)
    at Object.readFileSync (fs.js:343:35)
    at Module.<anonymous> (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/mnt/c/dev/photobook-api/services/photobook-api/node_modules/unicode-properties/unicode-properties.es.js:137:30)
    at Module.../../../services/photobook-api/node_modules/unicode-properties/unicode-properties.es.js (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:47407:30)
    at __webpack_require__ (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:19:1)
    at Object.<anonymous> (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/mnt/c/dev/photobook-api/services/photobook-api/node_modules/fontkit/index.js:24:31)
    at Object.../../../services/photobook-api/node_modules/fontkit/index.js (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:37486:30)
    at __webpack_require__ (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:19:1)
    at Module.<anonymous> (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/mnt/c/dev/photobook-api/services/photobook-api/node_modules/pdfkit/js/pdfkit.es5.js:1:1)
    at Module.../../../services/photobook-api/node_modules/pdfkit/js/pdfkit.es5.js (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:44528:30)
    at __webpack_require__ (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:19:1)
    at Module.../../../services/photobook-api/src/util/PreviewBase.js (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:48211:64)
    at __webpack_require__ (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:19:1)
    at Module.../../../services/photobook-api/src/util/BookPreview.js (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:47669:70)
    at __webpack_require__ (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:19:1)
    at Module.../../../services/photobook-api/src/generate-preview.js (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:47567:75)
    at __webpack_require__ (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:19:1)
    at /mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/webpack:/webpack/bootstrap:83:1       at Object.<anonymous> (/mnt/c/dev/photobook-api/services/photobook-api/.webpack/generate-preview/src/generate-preview.js:87:10)
    at Module._compile (internal/modules/cjs/loader.js:701:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
    at Module.load (internal/modules/cjs/loader.js:600:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
    at Function.Module._load (internal/modules/cjs/loader.js:531:3)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at AwsInvokeLocal.invokeLocalNodeJs (/usr/lib/node_modules/serverless/lib/plugins/aws/invokeLocal/index.js:616:33)     at AwsInvokeLocal.invokeLocal (/usr/lib/node_modules/serverless/lib/plugins/aws/invokeLocal/index.js:167:19)           at AwsInvokeLocal.tryCatcher (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/util.js:16:23)         at Promise._settlePromiseFromHandler (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/promise.js:604:18)        at Promise._settlePromiseCtx (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/promise.js:641:10)     at _drainQueueStep (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/async.js:97:12)
    at _drainQueue (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/async.js:86:9)
    at Async._drainQueues (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/async.js:102:5)
    at Immediate.Async.drainQueues [as _onImmediate] (/usr/lib/node_modules/serverless/node_modules/bluebird/js/release/async.js:15:14)
    at runCallback (timers.js:705:18)
    at tryOnImmediate (timers.js:676:5)
    at processImmediate (timers.js:658:5)
    at process.topLevelDomainCallback (domain.js:120:23)
  errno: -2,
  syscall: 'open',
  code: 'ENOENT',
  path: '//data.trie' }

I was able to use pdfkit with no problems when using serverless-webpack with the following webpack.config.js:

const slsw = require("serverless-webpack");
const nodeExternals = require("webpack-node-externals");

module.exports = {
  entry: slsw.lib.entries,
  target: "node",
  // Generate sourcemaps for proper error messages
  devtool: 'source-map',
  // Since 'aws-sdk' is not compatible with webpack,
  // we exclude all node dependencies
  externals: [nodeExternals()],
  mode: slsw.lib.webpack.isLocal ? "development" : "production",
  optimization: {
    // We do not want to minimize our code.
    minimize: false
  },
  performance: {
    // Turn off size warnings for entry points
    hints: false
  },
  // Run babel on all .js files and skip those in node_modules
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: "babel-loader",
        include: __dirname,
        exclude: /node_modules/
      }
    ]
  }
};

How can I configure serverless-bundle so that pdfkit works? Thanks in advance.

[carlcheel-sage]

This issue can be resolved by adding pdfkit to the serverless-bundle externals config.

Example

custom:
  bundle:
    externals: # Set non Webpack compatible packages as externals
      - pdfkit # They'll be included in the node_modules/

Note: Sometimes 3rd party modules aren’t compatible with webpack for various reasons.

I believe this was working with serverless-webpack directly due to using webpack-node-externals.

Based on this, I believe this issue can be closed @jayair.

[jayair]

@carlcheel-sage Awesome. Thanks for looking into it.