Taion Expression

What can you evaluate?

Expression	Result
`2 + 3 * 4`	`14`
`price * (1 - discount)`	`90`
`user.age >= 18 ? "Adult" : "Minor"`	`"Adult"`
`toUpperCase("hello world")`	`"HELLO WORLD"`
`contains(email, "@")`	`true`
`sum(scores) / length(scores)`	`85`
`if (total > 100) then total * 0.9 else total`	`135`
`map([1, 2, 3], x => x * 2)`	`[2, 4, 6]`
`filter(items, x => x > 3)`	`[4, 5]`
`Hello, ${name}!`	`"Hello, Alice!"`
`round(avg([10, 20, 33]))`	`21`

Quick Example
import { evaluateExpression } from 'taion-expression';

const result = evaluateExpression(
  'user.age >= 18 ? "Welcome" : "Too young"',
  { user: { name: 'Alice', age: 25 } }
);

// result = { success: true, result: 'Welcome' }

Safe & Sandboxed

Evaluate untrusted user expressions without risk. Built-in timeout control, call stack limits, complexity checks, and prototype pollution prevention keep your application secure.

Expressive Language

Arithmetic, comparison, and logical operators. Conditionals, arrays, template strings, arrow functions, and a large set of built-in functions for strings, math, arrays, objects, and type checking.

TypeScript First

Full type definitions with discriminated union result types. Dual CJS/ESM package support. Zero runtime dependencies.