diff --git a/libraries/o-error/README.md b/libraries/o-error/README.md
index 8c922eadc6..44afcb367d 100644
--- a/libraries/o-error/README.md
+++ b/libraries/o-error/README.md
@@ -1,21 +1,19 @@
-# overleaf-error-type
+# @overleaf/o-error
 
-Make custom error types that:
+Make custom error classes that:
 - pass `instanceof` checks,
 - have stack traces,
 - support custom messages and properties (`info`), and
 - can wrap internal errors (causes) like [VError](https://github.com/joyent/node-verror).
 
-## For ES6
-
 ES6 classes make it easy to define custom errors by subclassing `Error`. Subclassing `OError` adds a few extra helpers.
 
-### Usage
+## Usage
 
-#### Throw an error directly
+### Throw an error directly
 
 ```js
-const OError = require('overleaf-error-type')
+const OError = require('@overleaf/o-error')
 
 function doSomethingBad () {
   throw new OError({
@@ -25,13 +23,13 @@ function doSomethingBad () {
 }
 doSomethingBad()
 // =>
-// { ErrorTypeError: did something bad
+// { OError: did something bad
 //    at doSomethingBad (repl:2:9) <-- stack trace
-//    name: 'ErrorTypeError',      <-- default name
+//    name: 'OError',              <-- default name
 //    info: { thing: 'foo' } }     <-- attached info
 ```
 
-#### Custom error class
+### Custom error class
 
 ```js
 class FooError extends OError {
@@ -51,7 +49,7 @@ doFoo()
 //    info: { foo: 'bar' } }   <-- attached info
 ```
 
-#### Wrapping an inner error (cause)
+### Wrapping an inner error (cause)
 
 ```js
 function doFoo2 () {
@@ -90,91 +88,11 @@ try {
 //     ...
 ```
 
-## For ES5
-
-For backward compatibility, the following ES5-only interface is still supported.
-
-The approach is based mainly on https://gist.github.com/justmoon/15511f92e5216fa2624b; it just tries to DRY it up a bit.
-
-### Usage
-
-#### Define a standalone error class
-
-```js
-const OError = require('overleaf-error-type')
-
-const CustomError = OError.define('CustomError')
-
-function doSomethingBad () {
-  throw new CustomError()
-}
-doSomethingBad()
-// =>
-// CustomError                        <-- correct name
-//    at doSomethingBad (repl:2:9)    <-- stack trace
-```
-
-#### Define an error subclass
-
-```js
-const SubCustomError = OError.extend(CustomError, 'SubCustomError')
-
-try {
-  throw new SubCustomError()
-} catch (err) {
-  console.log(err.name) // => SubCustomError
-  console.log(err instanceof SubCustomError) // => true
-  console.log(err instanceof CustomError) // => true
-  console.log(err instanceof Error) // => true
-}
-```
-
-#### Add custom message and/or properties
-
-```js
-const UserNotFoundError = OError.define('UserNotFoundError',
-  function (userId) {
-    this.message = `User not found: ${userId}`
-    this.userId = userId
-  })
-
-throw new UserNotFoundError(123)
-// => UserNotFoundError: User not found: 123
-```
-
-#### Add custom Error types under an existing class
-
-```js
-class User {
-  static lookup (userId) {
-    throw new User.UserNotFoundError(userId)
-  }
-}
-
-OError.defineIn(User, 'UserNotFoundError', function (userId) {
-  this.message = `User not found: ${userId}`
-  this.userId = userId
-})
-
-User.lookup(123)
-// =>
-// UserNotFoundError: User not found: 123
-//    at Function.lookup (repl:3:11)
-```
-
 ## References
 
-General:
-
 - [MDN: Error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error)
 - [Error Handling in Node.js](https://www.joyent.com/node-js/production/design/errors)
 - [verror](https://github.com/joyent/node-verror)
-
-For ES6:
-
 - [Custom JavaScript Errors in ES6](https://medium.com/@xjamundx/custom-javascript-errors-in-es6-aa891b173f87)
 - [Custom errors, extending Error](https://javascript.info/custom-errors)
-
-For ES5:
-
-- https://gist.github.com/justmoon/15511f92e5216fa2624b
+- https://gist.github.com/justmoon/15511f92e5216fa2624b (some tests are based largely on this gist)
diff --git a/libraries/o-error/index.js b/libraries/o-error/index.js
index 0f00eb0600..b6cf0362b1 100644
--- a/libraries/o-error/index.js
+++ b/libraries/o-error/index.js
@@ -1,7 +1,5 @@
 'use strict'
 
-var util = require('util')
-
 /**
  * Make custom error types that pass `instanceof` checks, have stack traces,
  * support custom messages and properties, and support wrapping errors (causes).
@@ -9,10 +7,6 @@ var util = require('util')
  * @module
  */
 
-//
-// For ES6+ Classes
-//
-
 /**
  * A base class for custom errors that handles:
  *
@@ -96,45 +90,4 @@ OError.getFullInfo = getFullInfo
 OError.getFullStack = getFullStack
 OError.hasCauseInstanceOf = hasCauseInstanceOf
 
-//
-// For ES5
-//
-
-function extendErrorType (base, name, builder) {
-  var errorConstructor = function () {
-    Error.captureStackTrace && Error.captureStackTrace(this, this.constructor)
-    if (builder) builder.apply(this, arguments)
-    this.name = name
-  }
-
-  util.inherits(errorConstructor, base)
-
-  errorConstructor.prototype.withCause = function (cause) {
-    this.cause = cause
-    if (this.message && cause.message) {
-      this.message += ': ' + cause.message
-    }
-    return this
-  }
-
-  return errorConstructor
-}
-
-function defineErrorType (name, builder) {
-  return extendErrorType(Error, name, builder)
-}
-
-function extendErrorTypeIn (container, base, name, builder) {
-  container[name] = extendErrorType(base, name, builder)
-}
-
-function defineErrorTypeIn (container, name, builder) {
-  extendErrorTypeIn(container, Error, name, builder)
-}
-
-OError.extend = extendErrorType
-OError.define = defineErrorType
-OError.extendIn = extendErrorTypeIn
-OError.defineIn = defineErrorTypeIn
-
 module.exports = OError
diff --git a/libraries/o-error/npm-shrinkwrap.json b/libraries/o-error/package-lock.json
similarity index 99%
rename from libraries/o-error/npm-shrinkwrap.json
rename to libraries/o-error/package-lock.json
index 3501376406..9324f8f8e8 100644
--- a/libraries/o-error/npm-shrinkwrap.json
+++ b/libraries/o-error/package-lock.json
@@ -1,6 +1,6 @@
 {
-  "name": "overleaf-error-type",
-  "version": "1.0.0",
+  "name": "@overleaf/o-error",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -523,13 +523,13 @@
     },
     "minimist": {
       "version": "0.0.8",
-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "resolved": "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
       "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
       "dev": true
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "dev": true,
       "requires": {
diff --git a/libraries/o-error/package.json b/libraries/o-error/package.json
index 152dde4547..a3547eff77 100644
--- a/libraries/o-error/package.json
+++ b/libraries/o-error/package.json
@@ -1,14 +1,13 @@
 {
-  "name": "overleaf-error-type",
-  "version": "1.0.0",
-  "description": "Make custom error types that pass `instanceof` checks, have stack traces and support custom messages and properties.",
+  "name": "@overleaf/o-error",
+  "version": "2.0.0",
+  "description": "Make custom error types that pass `instanceof` checks, have stack traces, support custom messages and properties, and can wrap causes (like VError).",
   "main": "index.js",
   "scripts": {
     "test": "mocha --require test/support"
   },
   "author": "Overleaf (https://www.overleaf.com)",
   "license": "MIT",
-  "private": true,
   "devDependencies": {
     "chai": "^3.3.0",
     "mocha": "^6.1.4"
diff --git a/libraries/o-error/test/error-type.test.js b/libraries/o-error/test/error-type.test.js
deleted file mode 100644
index 9526201639..0000000000
--- a/libraries/o-error/test/error-type.test.js
+++ /dev/null
@@ -1,115 +0,0 @@
-'use strict'
-
-var OError = require('..')
-const { expectError } = require('./support')
-
-describe('OError', function () {
-  it('defines a custom error type', function () {
-    var CustomError = OError.define('CustomError')
-
-    function doSomethingBad () {
-      throw new CustomError()
-    }
-
-    try {
-      doSomethingBad()
-      expect.fail('should have thrown')
-    } catch (e) {
-      expectError(e, {
-        name: 'CustomError',
-        klass: CustomError,
-        message: 'CustomError',
-        firstFrameRx: /doSomethingBad/
-      })
-    }
-  })
-
-  it('defines a custom error type with a message', function () {
-    var CustomError = OError.define('CustomError', function (x) {
-      this.message = 'x=' + x
-      this.x = x
-    })
-
-    function doSomethingBad () {
-      throw new CustomError('foo')
-    }
-
-    try {
-      doSomethingBad()
-      expect.fail('should have thrown')
-    } catch (e) {
-      expect(e.toString()).to.equal('CustomError: x=foo')
-      expect(e.message).to.equal('x=foo')
-      expect(e.x).to.equal('foo')
-    }
-  })
-
-  it('defines extended error type', function () {
-    var BaseError = OError.define('BaseError')
-    var DerivedError = OError.extend(BaseError, 'DerivedError')
-
-    function doSomethingBad () {
-      throw new DerivedError()
-    }
-
-    try {
-      doSomethingBad()
-      expect.fail('should have thrown')
-    } catch (e) {
-      expect(e.toString()).to.equal('DerivedError')
-    }
-  })
-
-  it('defines error types in a container object', function () {
-    var SomeClass = {}
-    OError.defineIn(SomeClass, 'CustomError')
-
-    function doSomethingBad () {
-      throw new SomeClass.CustomError()
-    }
-
-    try {
-      doSomethingBad()
-      expect.fail('should have thrown')
-    } catch (e) {
-      expect(e.toString()).to.equal('CustomError')
-    }
-  })
-
-  it('extends error types in a container object', function () {
-    var SomeClass = {}
-    OError.defineIn(SomeClass, 'CustomError', function (payload) {
-      this.message = 'custom error'
-      this.payload = payload
-    })
-    OError.extendIn(SomeClass, SomeClass.CustomError, 'DerivedCustomError',
-      function (payload) {
-        SomeClass.CustomError.call(this, payload)
-        this.message = 'derived custom error'
-      })
-
-    function doSomethingBad () {
-      throw new SomeClass.CustomError(123)
-    }
-
-    try {
-      doSomethingBad()
-      expect.fail('should have thrown')
-    } catch (e) {
-      expect(e.toString()).to.equal('CustomError: custom error')
-      expect(e.payload).to.equal(123)
-    }
-
-    function doSomethingBadWithDerived () {
-      throw new SomeClass.DerivedCustomError(456)
-    }
-
-    try {
-      doSomethingBadWithDerived()
-      expect.fail('should have thrown')
-    } catch (e) {
-      expect(e.toString()).to.equal('DerivedCustomError: derived custom error')
-      expect(e.payload).to.equal(456)
-    }
-  })
-})
diff --git a/libraries/o-error/test/error-type-util.test.js b/libraries/o-error/test/o-error-util.test.js
similarity index 100%
rename from libraries/o-error/test/error-type-util.test.js
rename to libraries/o-error/test/o-error-util.test.js
diff --git a/libraries/o-error/test/error-type-class.test.js b/libraries/o-error/test/o-error.test.js
similarity index 98%
rename from libraries/o-error/test/error-type-class.test.js
rename to libraries/o-error/test/o-error.test.js
index fc0543f04d..0fd5020528 100644
--- a/libraries/o-error/test/error-type-class.test.js
+++ b/libraries/o-error/test/o-error.test.js
@@ -99,7 +99,6 @@ describe('OError', () => {
   it('handles a custom error without info', () => {
     try {
       throw new CustomError1({})
-      expect.fail('should have thrown')
     } catch (e) {
       expect(OError.getFullInfo(e)).to.deep.equal({})
       let infoKey = Object.keys(e).find(k => k === 'info')
diff --git a/libraries/o-error/test/support/index.js b/libraries/o-error/test/support/index.js
index 24cbc45270..502348acdf 100644
--- a/libraries/o-error/test/support/index.js
+++ b/libraries/o-error/test/support/index.js
@@ -4,7 +4,7 @@ var chai = require('chai')
 
 global.expect = chai.expect
 
-exports.expectError = function errorTypeExpectError (e, expected) {
+exports.expectError = function OErrorExpectError (e, expected) {
   // should set the name to the error's name
   expect(e.name).to.equal(expected.name)