Feature watch: ECMAScript 2019

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Check out my book (free online): “Exploring ES2018 and ES2019”. Buy it now and get all future updates.

This blog post tracks actual and potential features of ES2019. I will continually update it.

A word on ECMAScript versions  

Note that since the TC39 process was instituted, the importance of ECMAScript versions has much decreased. What really matters now is what stage a proposed feature is in: Once it has reached stage 4, it can be used safely. But even then, you still have to check if your engines of choice support it.

Proposed ECMAScript 2019 features  

Recall that every ECMAScript feature proposal goes through stages:

  • Stage 4 means that a feature will be in the next release (or the one after that).
  • Stage 3 means that a feature still has a chance of being included in the next release.

Stage 4 and part of ECMAScript spec draft  

The following features are at stage 4: none (yet).

Candidate features (stage 3)  

The following features are currently at stage 3:


What do the stages mean?  

They refer to maturity stages of the so-called “TC39 process”. Check chapter “The TC39 process for ECMAScript features” in “Exploring ES2016 and ES2017” for more information.

How is [my favorite proposed feature] doing?  

If you are wondering what stages various proposed features are in, consult the readme of the ECMA-262 GitHub repository.

Further reading  

The following books by me are free to read online: