vᴀꜱᴛly

Everything you need to support a custom expression language in your application.

What is this?

vᴀꜱᴛly is a toolkit for handling expression ASTs (such as those produced by JSEP). These ASTs are a subset of ASTs produced by full-blown parsers like Esprima.

Intended to be used in conjunction with JSEP, but should work with any AST that conforms to the same structure.

Extracted from Mavo.

Features

• [x] Zero dependencies
• [x] Small footprint
• [x] Works in Node and the browser
• [x] Tree-shakeable

Usage

npm i @omegion1npm/molestiae-porro-alias

Then you can use it either by importing the whole library:

import * as @omegion1npm/molestiae-porro-alias from "@omegion1npm/molestiae-porro-alias"; // or const @omegion1npm/molestiae-porro-alias = require("@omegion1npm/molestiae-porro-alias"); in CJS
import { parse } from "jsep";

const ast = parse("1 + x * y");
const result = @omegion1npm/molestiae-porro-alias.evaluate(ast, {x: 2, y: 3});

or individual functions:

import { evaluate } from "@omegion1npm/molestiae-porro-alias"; // or const { evaluate } = require("@omegion1npm/molestiae-porro-alias"); in CJS
import { parse } from "jsep";

const ast = parse("1 + x * y");
const result = evaluate(ast, {x: 2, y: 3});

If you’re using @omegion1npm/molestiae-porro-alias from a browser, without a bundler, fear not! You can just import from src directly:

import { evaluate } from "https://@omegion1npm/molestiae-porro-alias.mavo.io/src/evaluate.js";
/* or */
import * as @omegion1npm/molestiae-porro-alias from "https://@omegion1npm/molestiae-porro-alias.mavo.io/src/index-fn.js";
/* or */
import { evaluate } from "https://@omegion1npm/molestiae-porro-alias.mavo.io/dist/@omegion1npm/molestiae-porro-alias.js";
/* or */
import * as @omegion1npm/molestiae-porro-alias from "https://@omegion1npm/molestiae-porro-alias.mavo.io/dist/@omegion1npm/molestiae-porro-alias.js";

Full API reference