2020-02-18, Version 12.16.1 'Erbium' (LTS)

Notable changes:

Node.js 12.16.0 included 6 regressions that are being fixed in this
release

**Accidental Unflagging of Self Resolving Modules**:

12.16.0 included a large update to the ESM implementation. One of the
new features, Self Referential Modules, was accidentally released
without requiring the `--experimental-modules` flag. This release is
being made to appropriately flag the feature.

**Process Cleanup Changed Introduced WASM-Related Assertion**:

A change during Node.js process cleanup led to a crash in combination
with specific usage of WASM. This has been fixed by partially reverted
said change. A regression test and a full fix are being worked on and
will likely be included in future 12.x and 13.x releases.

**Use Largepages Runtime Option Introduced Linking Failure**:

A Semver-Minor change to introduce `--use-largepages` as a runtime
option introduced a linking failure. This had been fixed in master but
regressed as the fix has not yet gone out in a Current release. The
feature has been reverted, but will be able to reland with a fix in a
future Semver-Minor release.

**Async Hooks was Causing an Exception When Handling Errors**:

Changes in async hooks internals introduced a case where an internal
api call could be called with undefined causing a process to crash. The
change to async hooks was reverted. A regression test and fix has been
proposed and the change could re land in a future Semver-Patch release
if the regression is reliably fixed.

**New Enumerable Read-Only Property on EventEmitter breaks @types/extend**

A new property for enumerating events was added to the EventEmitter
class. This broke existing code that was using the `@types/extend`
module for extending classses as `@types/extend` was attemping to write
over the existing field which the new change made read-only. As this is
the first property on EventEmitter that is read-only this feature could
be considered Semver-Major. The new feature has been reverted but could
re land in a future Semver-Minor release if a non breaking way of
applying it is found.

**Exceptions in the HTTP parser were not emitting an uncaughtException**

A refactoring to Node.js interanls resulted in a bug where errors in
the HTTP parser were not being emitted by
`process.on('uncaughtException')`. The fix to this bug has been
included in this release.

PR-URL: https://github.com/nodejs/node/pull/31781