@babel/helper-define-map

What is @babel/helper-define-map?

The @babel/helper-define-map package is a helper module used by Babel plugins to define a map of properties on a given object. It is typically used to generate the definitions for an object's methods or properties in a way that is compatible with Babel's internal AST structures.

What are @babel/helper-define-map's main functionalities?

Define properties on an object

This feature allows you to define methods or properties on an object within the Babel transformation process. The code sample represents an AST (Abstract Syntax Tree) structure that defines a method named 'methodName' on an object.

{"type":"ObjectExpression","properties":[{"key":{"type":"Identifier","name":"methodName"},"value":{"type":"FunctionExpression","params":[],"body":{"type":"BlockStatement","body":[]},"generator":false,"async":false},"kind":"method"}]}

Other packages similar to @babel/helper-define-map

@babel/types

This package contains methods for building AST nodes. It is similar to @babel/helper-define-map in that it is used to define and manipulate parts of the AST, but it is more general-purpose and provides a wider range of node constructors.

recast

Recast is a JavaScript AST manipulation library that allows you to parse, modify, and print your code. While it provides similar functionality in terms of manipulating ASTs, it is a more comprehensive tool that includes its own parser and printer.

README

@babel/helper-define-map

Helper function to define a map

See our website @babel/helper-define-map for more information.

Install

Using npm:

npm install --save @babel/helper-define-map

or using yarn:

yarn add @babel/helper-define-map

Changelog

v7.18.6 (2022-06-27)

:eyeglasses: Spec Compliance

• babel-parser
  • #14650 [ts] Disallow property access after instantiation expression (@nicolo-ribaudo)
  • #14636 [ts] Allow ...<...> followed by newline or binary operator (@nicolo-ribaudo)
• babel-generator, babel-parser, babel-preset-env, babel-template
  • #14668 JSON modules should be imported with default (@JLHwung)

:bug: Bug Fix

• babel-helper-remap-async-to-generator, babel-plugin-proposal-async-generator-functions
  • #14391 Transform await in computed class keys (@Yokubjon-J)
• babel-plugin-transform-parameters
  • #14694 fix: preserve function params type if possible (@magic-akari)
• babel-core
  • #14583 fix: Memory leak when deep cloning in babel-core (@liuxingbaoyu)
• babel-core, babel-helper-check-duplicate-nodes, babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression, babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining, babel-plugin-proposal-destructuring-private, babel-plugin-proposal-optional-chaining, babel-plugin-transform-runtime
  • #14663 Fix import { types } from "@babel/core" with native ESM (@nicolo-ribaudo)

:house: Internal

• babel-standalone
  • #14697 Add proposal-unicode-sets-regex to @babel/standalone (@nicolo-ribaudo)
• Other
  • #14687 chore: Update bench baselines (@liuxingbaoyu)
• babel-generator, babel-types
  • #14685 enable TS compiler option: strictBindCallApply (@JLHwung)
• babel-code-frame, babel-core, babel-generator, babel-helper-annotate-as-pure, babel-helper-builder-binary-assignment-operator-visitor, babel-helper-builder-react-jsx, babel-helper-check-duplicate-nodes, babel-helper-compilation-targets, babel-helper-create-class-features-plugin, babel-helper-create-regexp-features-plugin, babel-helper-define-map, babel-helper-explode-assignable-expression, babel-helper-fixtures, babel-helper-function-name, babel-helper-hoist-variables, babel-helper-member-expression-to-functions, babel-helper-module-imports, babel-helper-module-transforms, babel-helper-optimise-call-expression, babel-helper-plugin-test-runner, babel-helper-plugin-utils, babel-helper-remap-async-to-generator, babel-helper-replace-supers, babel-helper-simple-access, babel-helper-split-export-declaration, babel-helper-transform-fixture-test-runner, babel-helper-validator-option, babel-helper-wrap-function, babel-helpers, babel-highlight, babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining, babel-plugin-external-helpers, babel-plugin-proposal-async-generator-functions, babel-plugin-proposal-class-static-block, babel-plugin-proposal-decorators, babel-plugin-proposal-destructuring-private, babel-plugin-proposal-function-bind, babel-plugin-proposal-function-sent, babel-plugin-proposal-json-strings, babel-plugin-proposal-object-rest-spread, babel-plugin-proposal-optional-chaining, babel-plugin-proposal-partial-application, babel-plugin-proposal-pipeline-operator, babel-plugin-proposal-private-property-in-object, babel-plugin-proposal-record-and-tuple, babel-plugin-syntax-typescript, babel-plugin-transform-block-scoped-functions, babel-plugin-transform-block-scoping, babel-plugin-transform-classes, babel-plugin-transform-computed-properties, babel-plugin-transform-destructuring, babel-plugin-transform-duplicate-keys, babel-plugin-transform-exponentiation-operator, babel-plugin-transform-flow-comments, babel-plugin-transform-flow-strip-types, babel-plugin-transform-for-of, babel-plugin-transform-function-name, babel-plugin-transform-modules-amd, babel-plugin-transform-modules-commonjs, babel-plugin-transform-modules-systemjs, babel-plugin-transform-modules-umd, babel-plugin-transform-object-super, babel-plugin-transform-parameters, babel-plugin-transform-property-mutators, babel-plugin-transform-proto-to-assign, babel-plugin-transform-react-constant-elements, babel-plugin-transform-react-display-name, babel-plugin-transform-react-inline-elements, babel-plugin-transform-react-jsx-compat, babel-plugin-transform-react-jsx-source, babel-plugin-transform-react-jsx, babel-plugin-transform-runtime, babel-plugin-transform-typescript, babel-plugin-transform-unicode-escapes, babel-preset-env, babel-preset-typescript, babel-standalone, babel-template, babel-traverse, babel-types
  • #14601 enable noImplicitAny (@JLHwung)
• babel-core, babel-helper-transform-fixture-test-runner, babel-plugin-transform-destructuring
  • #14659 Run Babel asynchronously in fixtures (@nicolo-ribaudo)