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babel-template
Advanced tools
The babel-template npm package is a utility that allows developers to create reusable AST (Abstract Syntax Tree) templates based on a string input. It simplifies the process of generating AST nodes programmatically, which is particularly useful when working with Babel plugins that manipulate code.
AST Template Creation
This feature allows the creation of AST nodes from a template string. The example shows how to create a variable declaration that requires a module, with placeholders for the module name and source.
const template = require('babel-template');
const buildRequire = template(`
var IMPORT_NAME = require(SOURCE);
`);
const ast = buildRequire({
IMPORT_NAME: 'myModule',
SOURCE: '"my-module"'
});
This package is an official part of the Babel ecosystem and serves a similar purpose to babel-template, providing API improvements and better integration with the latest Babel versions. It offers enhanced usability and security features.
Recast is another tool for manipulating ASTs. It focuses on preserving the original formatting as much as possible, which is different from babel-template's approach of creating new AST nodes from templates. Recast is better suited for applications where code formatting needs to be maintained.
Generate an AST from a string template.
In computer science, this is known as an implementation of quasiquotes.
npm install --save-dev babel-template
import template from "babel-template";
import generate from "babel-generator";
import * as t from "babel-types";
const buildRequire = template(`
var IMPORT_NAME = require(SOURCE);
`);
const ast = buildRequire({
IMPORT_NAME: t.identifier("myModule"),
SOURCE: t.stringLiteral("my-module")
});
console.log(generate(ast).code);
const myModule = require("my-module");
template(code, [opts])
Type: string
babel-template
accepts all of the options from babylon, and specifies
some defaults of its own:
allowReturnOutsideFunction
is set to true
by default.allowSuperOutsideMethod
is set to true
by default.Type: boolean
Default: false
Set this to true
to preserve any comments from the code
parameter.
babel-template
returns a function
which is invoked with an optional object
of replacements. See the usage section for an example.
FAQs
Generate an AST from a string template.
We found that babel-template demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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