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Update lib for base/dom TS configs to target es2020 #239

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merged 1 commit into from Jun 11, 2021
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Update lib for base/dom TS configs to target es2020 #239

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6 changes: 5 additions & 1 deletion packages/typescript-configs/CHANGELOG.md
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Expand Up @@ -5,7 +5,11 @@ All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
and adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).

<!-- ## Unreleased -->
## Unreleased

### Breaking Change

Increased the target and lib definitions to es2020 in both `base.json` and `dom.json`. This allows for a greater range of standard features to be defined and used. We expect typescript will be ran through Babel to downlevel/polyfill all features required for your target environment [[#239](https://github.com/Shopify/web-configs/pull/239)]
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@kaelig kaelig Apr 24, 2021 •
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💅

Suggested change
Increased the target and lib definitions to es2020 in both `base.json` and `dom.json`. This allows for a greater range of standard features to be defined and used. We expect typescript will be ran through Babel to downlevel/polyfill all features required for your target environment [[#239](https://github.com/Shopify/web-configs/pull/239)]
Increased the target and lib definitions to es2020 in both `base.json` and `dom.json`. This allows for a greater range of standard features to be defined and used. We expect TypeScript will be ran through Babel to downlevel/polyfill all features required for your target environment [[#239](https://github.com/Shopify/web-configs/pull/239)]


## 4.0.0 - 2021-02-24

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2 changes: 1 addition & 1 deletion packages/typescript-configs/base.json
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Expand Up @@ -4,7 +4,7 @@
"esModuleInterop": true,
"isolatedModules": true,
"experimentalDecorators": true,
"lib": ["dom", "es2018", "esnext.asynciterable"],
"lib": ["dom", "es2020"],
"moduleResolution": "node",
"noUnusedLocals": true,
"noUnusedParameters": true,
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7 changes: 3 additions & 4 deletions packages/typescript-configs/dom.json
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Expand Up @@ -5,12 +5,11 @@
"lib": [
"dom",
"dom.iterable",
"es2017",
"esnext.asynciterable",
"scripthost"
"scripthost",
"es2020"
],
"module": "esnext",
"target": "es2017"
"target": "es2020"
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@kaelig kaelig Apr 24, 2021 •
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ES2017 is still the best compilation target for modern browsers (supported by 95% of user agents), as it can be served without further transpiling using <script module src="..."></script>.
Then, apps who really want to support the additional 5% of browsers can transpile that first target into ES5, and serve it using <script nomodule src="..."></script>.

What I'm trying to say is that by keeping the target to ES2017, we're removing the need for a transpiler such as babel in most cases.

What am I missing here?

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We don't want tsc as part of our build chain, babel (or in a potential future esbuild) for single file transpilation is much better suited to our needs as they allow finer grained transpiling based on browser (/node) support of single features rather than whole standard versions.

Ideally tsc should only be used for type-checking, and we use something else to to builds. Thus this target doesn't really do anything, I'm just setting it here to match the lib value.

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Thank you, that makes sense!

},
"files": ["./definitions/images.d.ts", "./definitions/styles.d.ts"]
}