feat: Support bundlers.

README.md

@@ -92,6 +92,12 @@ In many cases, Pino is over 5x faster than alternatives.
 
 See the [Benchmarks](docs/benchmarks.md) document for comparisons.
 
+### Bundling support
+
+Pino supports to being bundled using tools like webpack or esbuild. 
+
+See [Bundling](docs/bundling.md) document for more informations.
+
 <a name="team"></a>
 ## The Team
 

docs/bundling.md

@@ -0,0 +1,30 @@
+# Bundling 
+
+Due to its internal architecture based on Worker Threads, it is not possible to bundle Pino *without* generating additional files.
+
+In particular, a bundler must ensure that the following files are also bundle separately:
+
+* `lib/worker.js` from the `thread-stream` dependency
+* `file.js`
+* `lib/worker.js`
+* `lib/worker-pipeline.js`
+* Any transport used by the user (like `pino-pretty`)
+
+Once the files above have been generated, the bundler must also add information about the files above by injecting a code which sets `__bundlerPathsOverrides` in the `globalThis` object.
+
+The variable is a object whose keys are identifier for the files and the the values are the paths of files relative to the currently bundle files.
+
+Example:
+
+```javascript
+// Inject this using your bundle plugin
+globalThis.__bundlerPathsOverrides = {
+  'thread-stream-worker': pinoWebpackAbsolutePath('./thread-stream-worker.js')
+  'pino/file': pinoWebpackAbsolutePath('./pino-file.js'),
+  'pino-worker': pinoWebpackAbsolutePath('./pino-worker.js'),
+  'pino-pipeline-worker': pinoWebpackAbsolutePath('./pino-pipeline-worker.js'),
+  'pino-pretty': pinoWebpackAbsolutePath('./pino-pretty.js'),
+};
+```
+
+Note that `pino/file`, `pino-worker`, `pino-pipeline-worker` and `thread-stream-worker` are required identifiers. Other identifiers are possible based on the user configuration.

lib/transport.js

@@ -81,6 +81,8 @@ function transport (fullOptions) {
   const { pipeline, targets, options = {}, worker = {}, caller = getCaller() } = fullOptions
   // This function call MUST stay in the top-level function of this module
   const callerRequire = createRequire(caller)
+  // This will be eventually modified by bundlers
+  const bundlerOverrides = '__bundlerPathsOverrides' in globalThis ? globalThis.__bundlerPathsOverrides : {}
 
   let target = fullOptions.target
 
@@ -89,15 +91,15 @@ function transport (fullOptions) {
   }
 
   if (targets) {
-    target = join(__dirname, 'worker.js')
+    target = bundlerOverrides['pino-worker'] || join(__dirname, 'worker.js')
     options.targets = targets.map((dest) => {
       return {
         ...dest,
         target: fixTarget(dest.target)
       }
     })
   } else if (fullOptions.pipeline) {
-    target = join(__dirname, 'worker-pipeline.js')
+    target = bundlerOverrides['pino-pipeline-worker'] || join(__dirname, 'worker-pipeline.js')
     options.targets = pipeline.map((dest) => {
       return {
         ...dest,
@@ -109,6 +111,8 @@ function transport (fullOptions) {
   return buildStream(fixTarget(target), options, worker)
 
   function fixTarget (origin) {
+    origin = bundlerOverrides[origin] || origin
+
     if (isAbsolute(origin) || origin.indexOf('file://') === 0) {
       return origin
     }

lib/worker-pipeline.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const EE = require('events')
+const { realImport, realRequire } = require('real-require')
 const { pipeline, PassThrough } = require('stream')
 
 // This file is not checked by the code coverage tool,
@@ -13,11 +14,11 @@ module.exports = async function ({ targets }) {
     let fn
     try {
       const toLoad = 'file://' + t.target
-      fn = (await import(toLoad)).default
+      fn = (await realImport(toLoad)).default
     } catch (error) {
       // See this PR for details: https://github.com/pinojs/thread-stream/pull/34
       if ((error.code === 'ENOTDIR' || error.code === 'ERR_MODULE_NOT_FOUND')) {
-        fn = require(t.target)
+        fn = realRequire(t.target)
       } else {
         throw error
       }

lib/worker.js

@@ -2,6 +2,7 @@
 
 const pino = require('../pino.js')
 const build = require('pino-abstract-transport')
+const { realImport, realRequire } = require('real-require')
 
 // This file is not checked by the code coverage tool,
 // as it is not reliable.
@@ -13,11 +14,11 @@ module.exports = async function ({ targets }) {
     let fn
     try {
       const toLoad = 'file://' + t.target
-      fn = (await import(toLoad)).default
+      fn = (await realImport(toLoad)).default
     } catch (error) {
       // See this PR for details: https://github.com/pinojs/thread-stream/pull/34
       if ((error.code === 'ENOTDIR' || error.code === 'ERR_MODULE_NOT_FOUND')) {
-        fn = require(t.target)
+        fn = realRequire(t.target)
       } else {
         throw error
       }

package.json

@@ -109,6 +109,7 @@
     "pino-abstract-transport": "v0.4.0",
     "pino-std-serializers": "^4.0.0",
     "quick-format-unescaped": "^4.0.3",
+    "real-require": "^0.1.0",
     "safe-stable-stringify": "^2.1.0",
     "sonic-boom": "^2.2.1",
     "thread-stream": "^0.11.1"

test/transport/bundlers-support.test.js

@@ -0,0 +1,106 @@
+'use strict'
+
+const os = require('os')
+const { join } = require('path')
+const { readFile } = require('fs').promises
+const { watchFileCreated } = require('../helper')
+const { test } = require('tap')
+const pino = require('../../pino')
+
+const { pid } = process
+const hostname = os.hostname()
+
+test('pino.transport with destination overriden by bundler', async ({ same, teardown }) => {
+  globalThis.__bundlerPathsOverrides = {
+    foobar: join(__dirname, '..', 'fixtures', 'to-file-transport.js')
+  }
+
+  const destination = join(
+    os.tmpdir(),
+    '_' + Math.random().toString(36).substr(2, 9)
+  )
+  const transport = pino.transport({
+    target: 'foobar',
+    options: { destination }
+  })
+  teardown(transport.end.bind(transport))
+  const instance = pino(transport)
+  instance.info('hello')
+  await watchFileCreated(destination)
+  const result = JSON.parse(await readFile(destination))
+  delete result.time
+  same(result, {
+    pid,
+    hostname,
+    level: 30,
+    msg: 'hello'
+  })
+
+  globalThis.__bundlerPathsOverrides = undefined
+})
+
+test('pino.transport with worker destination overriden by bundler', async ({ same, teardown }) => {
+  globalThis.__bundlerPathsOverrides = {
+    'pino-worker': join(__dirname, '..', '..', 'lib/worker.js')
+  }
+
+  const destination = join(
+    os.tmpdir(),
+    '_' + Math.random().toString(36).substr(2, 9)
+  )
+  const transport = pino.transport({
+    targets: [
+      {
+        target: join(__dirname, '..', 'fixtures', 'to-file-transport.js'),
+        options: { destination }
+      }
+    ]
+  })
+  teardown(transport.end.bind(transport))
+  const instance = pino(transport)
+  instance.info('hello')
+  await watchFileCreated(destination)
+  const result = JSON.parse(await readFile(destination))
+  delete result.time
+  same(result, {
+    pid,
+    hostname,
+    level: 30,
+    msg: 'hello'
+  })
+
+  globalThis.__bundlerPathsOverrides = undefined
+})
+
+test('pino.transport with worker-pipeline destination overriden by bundler', async ({ same, teardown }) => {
+  globalThis.__bundlerPathsOverrides = {
+    'pino-pipeline-worker': join(__dirname, '..', '..', 'lib/worker-pipeline.js')
+  }
+
+  const destination = join(
+    os.tmpdir(),
+    '_' + Math.random().toString(36).substr(2, 9)
+  )
+  const transport = pino.transport({
+    pipeline: [
+      {
+        target: join(__dirname, '..', 'fixtures', 'to-file-transport.js'),
+        options: { destination }
+      }
+    ]
+  })
+  teardown(transport.end.bind(transport))
+  const instance = pino(transport)
+  instance.info('hello')
+  await watchFileCreated(destination)
+  const result = JSON.parse(await readFile(destination))
+  delete result.time
+  same(result, {
+    pid,
+    hostname,
+    level: 30,
+    msg: 'hello'
+  })
+
+  globalThis.__bundlerPathsOverrides = undefined
+})