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@babel/helper-hoist-variables

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@babel/helper-hoist-variables

Helper function to hoist variables


Version published
Maintainers
4
Weekly downloads
33,507,464
decreased by-8.78%

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Package description

What is @babel/helper-hoist-variables?

The @babel/helper-hoist-variables package is a utility that is used within the Babel compiler to hoist variable declarations to the top of their respective scopes during the code transformation process. This is part of the Babel's internal mechanism to ensure that the transformed code adheres to the scoping rules of ECMAScript and to avoid issues with variable declarations in the transpiled output.

What are @babel/helper-hoist-variables's main functionalities?

Variable Hoisting

This feature allows the package to traverse a given AST (Abstract Syntax Tree) path and find all variable declarations. It then hoists these declarations to the top of the function or program scope. The 'emitOnScope' parameter is a callback that is called with an identifier for each variable that needs to be hoisted.

function hoistVariables(path, emitOnScope) {
  const names = Object.create(null);
  path.traverse({
    VariableDeclarator({ node }) {
      if (node.id.type === 'Identifier') {
        names[node.id.name] = true;
      }
    }
  });
  Object.keys(names).forEach(name => {
    emitOnScope.push({ id: t.identifier(name) });
  });
}

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Changelog

Source

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
:bug: Bug Fix
  • babel-helper-remap-async-to-generator, babel-plugin-proposal-async-generator-functions
  • babel-plugin-transform-parameters
  • babel-core
  • 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
:house: Internal
  • babel-standalone
  • Other
  • babel-generator, babel-types
  • 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
  • babel-core, babel-helper-transform-fixture-test-runner, babel-plugin-transform-destructuring

Readme

Source

@babel/helper-hoist-variables

Helper function to hoist variables

See our website @babel/helper-hoist-variables for more information.

Install

Using npm:

npm install --save @babel/helper-hoist-variables

or using yarn:

yarn add @babel/helper-hoist-variables

FAQs

Last updated on 27 Jun 2022

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