SF Formula

A powerful formula evaluation engine for TypeScript/JavaScript applications.

Installation

npm install sf-formula

Import Options

This library provides multiple import paths to avoid dependency conflicts, especially with CodeMirror:

Default Import (Compiled)

import { formulaEval } from 'sf-formula';

Core Functionality Only (Raw TypeScript)

// For projects that want to avoid CodeMirror dependencies
import { formulaEval } from 'sf-formula/core';

Raw TypeScript Source

// Direct access to TypeScript source files
import { formulaEval } from 'sf-formula/src';

Individual Modules

// Import specific functionality
import { defaultFunctions } from 'sf-formula/functions';
import { parser } from 'sf-formula/parser';

CodeMirror Integration

If you're using CodeMirror in your project and experiencing conflicts, use the /core import:

import { formulaEval } from 'sf-formula/core';
import { EditorView } from '@codemirror/view'; // Your own CodeMirror version

// This avoids duplicate CodeMirror instances
const result = formulaEval('2 + 2');

For CodeMirror language support (syntax highlighting, autocompletion), install peer dependencies:

npm install @codemirror/language @codemirror/autocomplete @lezer/common @lezer/highlight @lezer/lr

Then use:

import { languagePack } from 'sf-formula';
import { EditorView } from '@codemirror/view';

const view = new EditorView({
  extensions: [languagePack()],
  // ... other config
});

Usage

import { formulaEval } from 'sf-formula/core';

// Simple evaluation
const result = formulaEval('2 + 2'); // 4

// With variables
const context = { x: 10, y: 5 };
const result2 = formulaEval('x + y', context); // 15

// With nested objects
const context2 = { user: { age: 25 } };
const result3 = formulaEval('user.age > 18', context2); // true

// With functions
const result4 = formulaEval('IF(x > 0, "positive", "negative")', { x: 5 }); // "positive"

Peer Dependencies

If you need CodeMirror integration, install these peer dependencies:

• @codemirror/language
• @codemirror/autocomplete
• @lezer/common
• @lezer/highlight
• @lezer/lr

License

MIT