@babel/plugin-proposal-logical-assignment-operators

What is @babel/plugin-proposal-logical-assignment-operators?

The @babel/plugin-proposal-logical-assignment-operators package allows Babel to compile logical assignment operators into ES5 or your target environment's JavaScript. Logical assignment operators combine logical operations with assignment expressions, enabling more concise and expressive code.

What are @babel/plugin-proposal-logical-assignment-operators's main functionalities?

Logical AND assignment (&&=)

This feature allows the assignment of the right operand to the left operand only if the left operand is truthy. It's equivalent to `a = a && b;`.

a &&= b;

Logical OR assignment (||=)

This feature enables the assignment of the right operand to the left operand if the left operand is falsy. It simplifies the expression `a = a || b;`.

a ||= b;

Logical nullish assignment (??=)

This feature assigns the right operand to the left operand only if the left operand is null or undefined, making the code `a = a ?? b;` more concise.

a ??= b;

Other packages similar to @babel/plugin-proposal-logical-assignment-operators

@babel/plugin-proposal-optional-chaining

Similar in its proposal nature and goal to enhance JavaScript's expressiveness, this package allows for optional chaining (`?.`) in JavaScript, enabling reading the value of a property located deep within a chain of connected objects without having to expressly validate each reference in the chain.

@babel/plugin-proposal-nullish-coalescing-operator

This package introduces the nullish coalescing operator (`??`), which is closely related to the logical nullish assignment operator provided by @babel/plugin-proposal-logical-assignment-operators. It allows developers to provide a default value for potentially null or undefined expressions.

README

@babel/plugin-proposal-logical-assignment-operators

Transforms logical assignment operators into short-circuited assignments

See our website @babel/plugin-proposal-logical-assignment-operators for more information.

Install

Using npm:

npm install --save-dev @babel/plugin-proposal-logical-assignment-operators

or using yarn:

yarn add @babel/plugin-proposal-logical-assignment-operators --dev

Changelog

v7.20.7 (2022-12-22)

:eyeglasses: Spec Compliance

• babel-helper-member-expression-to-functions, babel-helper-replace-supers, babel-plugin-proposal-class-properties, babel-plugin-transform-classes
  • #15223 fix: Deleting super property should throw (@SuperSodaSea)
• babel-helpers, babel-plugin-proposal-class-properties, babel-plugin-transform-classes, babel-plugin-transform-object-super
  • #15241 fix: Throw correct error types from sed ant class TDZ helpers (@SuperSodaSea)

:bug: Bug Fix

• babel-parser, babel-plugin-transform-typescript
  • #15209 fix: Support auto accessors with TypeScript annotations (@liuxingbaoyu)
• babel-traverse
  • #15287 Fix .parentPath after rename in SwitchCase (@nicolo-ribaudo)
• babel-plugin-transform-typescript, babel-traverse
  • #15284 fix: Ts import type and func with duplicate name (@liuxingbaoyu)
• babel-plugin-transform-block-scoping
  • #15278 Fix tdz analysis for reassigned captured for bindings (@nicolo-ribaudo)
• babel-plugin-proposal-async-generator-functions, babel-preset-env
  • #15235 fix: Transform for await with shadowed variables (@liuxingbaoyu)
• babel-generator, babel-plugin-proposal-optional-chaining
  • #15258 fix: Correctly generate (a ?? b) as T (@liuxingbaoyu)
• babel-plugin-transform-react-jsx, babel-types
  • #15233 fix: Emit correct sourcemap ranges for JSXText (@liuxingbaoyu)
• babel-core, babel-helpers, babel-plugin-transform-computed-properties, babel-runtime-corejs2, babel-runtime-corejs3, babel-runtime
  • #15232 fix: Computed properties should keep original definition order (@SuperSodaSea)
• babel-helper-member-expression-to-functions, babel-helper-replace-supers, babel-plugin-proposal-class-properties, babel-plugin-transform-classes
  • #15223 fix: Deleting super property should throw (@SuperSodaSea)
• babel-generator
  • #15216 fix: Print newlines for leading Comments of TSEnumMember (@liuxingbaoyu)

:nail_care: Polish

• babel-plugin-transform-block-scoping, babel-traverse
  • #15275 Improve relative execution tracking in fn exprs (@nicolo-ribaudo)

:house: Internal

• babel-helper-define-map, babel-plugin-transform-property-mutators
  • #15274 Inline & simplify @babel/helper-define-map (@nicolo-ribaudo)
• babel-core, babel-plugin-proposal-class-properties, babel-plugin-transform-block-scoping, babel-plugin-transform-classes, babel-plugin-transform-destructuring, babel-plugin-transform-parameters, babel-plugin-transform-regenerator, babel-plugin-transform-runtime, babel-preset-env, babel-traverse
  • #15200 Rewrite transform-block-scoping plugin (@nicolo-ribaudo)

:running_woman: Performance

• babel-helper-compilation-targets
  • #15228 perf: Speed up getTargets (@liuxingbaoyu)