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estree-util-value-to-estree
Advanced tools
The estree-util-value-to-estree package is a utility that converts JavaScript values to ESTree nodes. ESTree is a standardized format for representing JavaScript code as an abstract syntax tree (AST). This package is useful for generating or manipulating JavaScript code programmatically.
Convert Primitive Values to ESTree Nodes
This feature allows you to convert primitive values like numbers, strings, and booleans into their corresponding ESTree nodes. In this example, the number 42 is converted into an ESTree node.
const { valueToEstree } = require('estree-util-value-to-estree');
const estreeNode = valueToEstree(42);
console.log(estreeNode);
Convert Arrays to ESTree Nodes
This feature allows you to convert arrays into ESTree nodes. In this example, the array [1, 2, 3] is converted into an ESTree node.
const { valueToEstree } = require('estree-util-value-to-estree');
const estreeNode = valueToEstree([1, 2, 3]);
console.log(estreeNode);
Convert Objects to ESTree Nodes
This feature allows you to convert objects into ESTree nodes. In this example, the object { key: 'value' } is converted into an ESTree node.
const { valueToEstree } = require('estree-util-value-to-estree');
const estreeNode = valueToEstree({ key: 'value' });
console.log(estreeNode);
babel-types is a utility library for AST nodes used by Babel. It provides methods to build, validate, and traverse AST nodes. Compared to estree-util-value-to-estree, babel-types offers a broader range of functionalities for AST manipulation but is more complex to use for simple value-to-node conversions.
esprima is a high-performance, standard-compliant ECMAScript parser that produces ASTs. While it focuses on parsing JavaScript code into ASTs, it does not provide direct utilities for converting values to ESTree nodes like estree-util-value-to-estree.
acorn is a small, fast, JavaScript-based JavaScript parser that produces ESTree-compliant ASTs. Similar to esprima, acorn focuses on parsing JavaScript code rather than converting values to ESTree nodes.
Convert a JavaScript value to an ESTree expression.
npm install estree-util-value-to-estree
This package converts a JavaScript value to an ESTree expression for values that can be constructed without the need for a context.
Currently the following types are supported:
bigint
boolean
null
number
(Including
Infinity
and NaN)string
symbol
(shared
and
well-known)object
Object
undefined
Array
BigInt64Array
BigUint64Array
Boolean
Buffer
Date
Float32Array
Float64Array
Int16Array
Int32Array
Int8Array
Map
Number
RegExp
Set
String
Temporal.Duration
Temporal.Instant
Temporal.PlainDate
Temporal.PlainDateTime
Temporal.PlainYearMonth
Temporal.PlainMonthDay
Temporal.PlainTime
Temporal.ZonedDateTime
Uint8Array
Uint8ClampedArray
Uint16Array
Uint32Array
URL
URLSearchParams
If options.instanceAsObject
is set to true
, other objects are turned into plain object.
import assert from 'node:assert/strict'
import { valueToEstree } from 'estree-util-value-to-estree'
const result = valueToEstree({
null: null,
undefined,
string: 'Hello world!',
number: 42,
negativeNumber: -1337,
infinity: Number.POSITIVE_INFINITY,
notANumber: Number.NaN,
regex: /\w+/i,
date: new Date('1970-01-01'),
array: ['I’m an array item!'],
object: { nested: 'value' }
})
assert.deepEqual(result, {
type: 'ObjectExpression',
properties: [
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'null' },
value: { type: 'Literal', value: null }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'undefined' },
value: { type: 'Identifier', name: 'undefined' }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'string' },
value: { type: 'Literal', value: 'Hello world!' }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'number' },
value: { type: 'Literal', value: 42 }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'negativeNumber' },
value: {
type: 'UnaryExpression',
operator: '-',
prefix: true,
argument: { type: 'Literal', value: 1337 }
}
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'infinity' },
value: { type: 'Identifier', name: 'Infinity' }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'notANumber' },
value: { type: 'Identifier', name: 'NaN' }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'regex' },
value: {
type: 'Literal',
value: /\w+/i,
regex: { pattern: '\\w+', flags: 'i' }
}
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'date' },
value: {
type: 'NewExpression',
callee: { type: 'Identifier', name: 'Date' },
arguments: [{ type: 'Literal', value: 0 }]
}
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'array' },
value: {
type: 'ArrayExpression',
elements: [{ type: 'Literal', value: 'I’m an array item!' }]
}
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'object' },
value: {
type: 'ObjectExpression',
properties: [
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'nested' },
value: { type: 'Literal', value: 'value' }
}
]
}
}
]
})
class Point {
line: number
column: number
constructor(line: number, column: number) {
this.line = line
this.column = column
}
}
// Normally complex objects throw.
assert.throws(() => valueToEstree(new Point(2, 3)))
// `instanceAsObject: true` treats them as plain objects.
assert.deepEqual(valueToEstree(new Point(2, 3), { instanceAsObject: true }), {
type: 'ObjectExpression',
properties: [
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'line' },
value: { type: 'Literal', value: 2 }
},
{
type: 'Property',
method: false,
shorthand: false,
computed: false,
kind: 'init',
key: { type: 'Literal', value: 'column' },
value: { type: 'Literal', value: 3 }
}
]
})
This API exports the function valueToEstree
.
valueToEstree(value, options?)
Convert a value to an ESTree node.
instanceAsObject
(boolean, default: false
) — If true, treat objects that have a prototype as
plain objects.preserveReferences
(boolean, default: false
) — If true, preserve references to the same object
found within the input. This also allows to serialize recursive structures. If needed, the
resulting expression will be an iife.This project is compatible with Node.js 16 or greater.
FAQs
Convert a JavaScript value to an estree expression
The npm package estree-util-value-to-estree receives a total of 148,588 weekly downloads. As such, estree-util-value-to-estree popularity was classified as popular.
We found that estree-util-value-to-estree demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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