babel-core
Babel compiler core.
$ npm install babel-core
SYNC missed versions from
official npm registry.
babel-core
Babel compiler core.
var babel = require("babel-core");
import { transform } from 'babel-core';
import * as babel from 'babel-core';
All transformations will use your local configuration files (.babelrc or in package.json). See options to disable it.
babel.transform(code: string, options?: Object)
Transforms the passed in code. Returning an object with the generated code,
source map, and AST.
babel.transform(code, options) // => { code, map, ast }
Example
var result = babel.transform("code();", options);
result.code;
result.map;
result.ast;
babel.transformFile(filename: string, options?: Object, callback: Function)
Asynchronously transforms the entire contents of a file.
babel.transformFile(filename, options, callback)
Example
babel.transformFile("filename.js", options, function (err, result) {
result; // => { code, map, ast }
});
babel.transformFileSync(filename: string, options?: Object)
Synchronous version of babel.transformFile. Returns the transformed contents of
the filename.
babel.transformFileSync(filename, options) // => { code, map, ast }
Example
babel.transformFileSync("filename.js", options).code;
babel.transformFromAst(ast: Object, code?: string, options?: Object)
Given, an AST, transform it.
const code = "if (true) return;";
const ast = babylon.parse(code, { allowReturnOutsideFunction: true });
const { code, map, ast } = babel.transformFromAst(ast, code, options);
Options
Babel CLI
You can pass these options from the Babel CLI like so:
babel --name=value
Following is a table of the options you can use:
| Option | Default | Description |
|---|---|---|
ast |
true |
Include the AST in the returned object |
auxiliaryCommentAfter |
null |
Attach a comment after all non-user injected code. |
auxiliaryCommentBefore |
null |
Attach a comment before all non-user injected code. |
babelrc |
true |
Specify whether or not to use .babelrc and .babelignore files. Not available when using the CLI, use --no-babelrc instead. |
code |
true |
Enable code generation |
comments |
true |
Output comments in generated output. |
compact |
"auto" |
Do not include superfluous whitespace characters and line terminators. When set to "auto" compact is set to true on input sizes of >500KB. |
env |
{} |
This is an object of keys that represent different environments. For example, you may have: { env: { production: { /* specific options */ } } } which will use those options when the environment variable BABEL_ENV is set to "production". If BABEL_ENV isn't set then NODE_ENV will be used, if it's not set then it defaults to "development" |
extends |
null |
A path to an .babelrc file to extend |
filename |
"unknown" |
Filename for use in errors etc. |
filenameRelative |
(filename) |
Filename relative to sourceRoot. |
generatorOpts |
{} |
An object containing the options to be passed down to the babel code generator, babel-generator |
getModuleId |
null |
Specify a custom callback to generate a module id with. Called as getModuleId(moduleName). If falsy value is returned then the generated module id is used. |
highlightCode |
true |
ANSI highlight syntax error code frames |
ignore |
null |
Opposite to the only option. ignore is disregarded if only is specified. |
inputSourceMap |
null |
A source map object that the output source map will be based on. |
minified |
false |
Should the output be minified (not printing last semicolons in blocks, printing literal string values instead of escaped ones, stripping () from new when safe) |
moduleId |
null |
Specify a custom name for module ids. |
moduleIds |
false |
If truthy, insert an explicit id for modules. By default, all modules are anonymous. (Not available for common modules) |
moduleRoot |
(sourceRoot) |
Optional prefix for the AMD module formatter that will be prepend to the filename on module definitions. |
only |
null |
A glob, regex, or mixed array of both, matching paths to only compile. Can also be an array of arrays containing paths to explicitly match. When attempting to compile a non-matching file it's returned verbatim. |
parserOpts |
{} |
An object containing the options to be passed down to the babel parser, babylon |
plugins |
[] |
List of plugins to load and use. |
presets |
[] |
List of presets (a set of plugins) to load and use. |
retainLines |
false |
Retain line numbers. This will lead to wacky code but is handy for scenarios where you can't use source maps. (NOTE: This will not retain the columns) |
resolveModuleSource |
null |
Resolve a module source ie. import "SOURCE"; to a custom value. Called as resolveModuleSource(source, filename). |
shouldPrintComment |
null |
An optional callback that controls whether a comment should be output or not. Called as shouldPrintComment(commentContents). NOTE: This overrides the comment option when used. |
sourceFileName |
(filenameRelative) |
Set sources[0] on returned source map. |
sourceMaps |
false |
If truthy, adds a map property to returned output. If set to "inline", a comment with a sourceMappingURL directive is added to the bottom of the returned code. If set to "both" then a map property is returned as well as a source map comment appended. This does not emit sourcemap files by itself! To have sourcemaps emitted using the CLI, you must pass it the --source-maps option. |
sourceMapTarget |
(filenameRelative) |
Set file on returned source map. |
sourceRoot |
(moduleRoot) |
The root from which all sources are relative. |
sourceType |
"module" |
Indicate the mode the code should be parsed in. Can be either "script" or "module". |
wrapPluginVisitorMethod |
null |
An optional callback that can be used to wrap visitor methods. NOTE: This is useful for things like introspection, and not really needed for implementing anything. Called as wrapPluginVisitorMethod(pluginAlias, visitorType, callback). |
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Maintainers (6)
danez
existentialism
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Dependencies (19)
- babel-code-frame ^6.26.0
- babel-generator ^6.26.0
- babel-helpers ^6.24.1
- babel-messages ^6.23.0
- babel-register ^6.26.0
- babel-runtime ^6.26.0
- babel-template ^6.26.0
- babel-traverse ^6.26.0
- babel-types ^6.26.0
- babylon ^6.18.0
- convert-source-map ^1.5.1
- debug ^2.6.9
- json5 ^0.5.1
- lodash ^4.17.4
- minimatch ^3.0.4
- path-is-absolute ^1.0.1
- private ^0.1.8
- slash ^1.0.0
- source-map ^0.5.7
Dev Dependencies (3)
- babel-helper-fixtures ^6.26.2
- babel-helper-transform-fixture-test-runner ^6.26.2
- babel-polyfill ^6.26.0
Dependents (84)
- @mapbox/jsxtreme-markdown
- @storybook/react
- abi-decoder
- af-babel-loader
- af-webpack
- autod
- ava
- babel
- babel-cli
- babel-eslint
- babel-extract-comments
- babel-file
- babel-jest
- babel-jscs
- babel-loader
- babel-minify
- babel-plugin-emotion
- babel-plugin-export-metadata
- babel-plugin-module-alias
- babel-plugin-preval
- babel-plugin-streamline
- babel-plugin-tester
- babel-plugin-transform-dev-warning
- babel-plugin-transform-react-remove-prop-types
- babel-plugin-transform-regenerator
- babel-preset-edge
- babel-register
- babelify
- babili-webpack-plugin
- bili
- coffeescript
- cst
- deck.gl
- documentation
- electron-rebuild
- es6-module-loader
- esformatter-jsx
- eslint-plugin-babel
- fast-async
- gatsby
- gatsby-recipes
- gulp-babel
- gulp-babel-minify
- gulp-jsx2example
- hard-source-webpack-plugin
- import-jsx
- jest-config
- jest-expo
- jest-runtime
- jscodeshift
- jscs
- jsx-control-statements
- kcd-scripts
- luma.gl
- markdown-doctest
- metro
- next
- node-minify
- postcss
- postcss-each
- postcss-neat
- prettier-eslint
- purgecss-webpack-plugin
- radium
- rc-tools
- react-cropper
- react-error-boundary
- react-native
- react-scripts
- regenerator
- regenerator-transform
- rewire
- rollup-plugin-babel
- rollup-plugin-vue
- scss-tokenizer
- streamline
- styled-jsx
- then-pug
- ts-jest
- tty-table
- umi-test
- videojs-generate-rollup-config
- webpack-cli
- webpack-hot-client