SocialCalc

This is the npm package for SocialCalc, an in-browser spreadsheet editor with support for real-time collaboration. This version is based on the version used in EtherCalc.

See it in action at ethercalc.net!

Requirements

• jQuery (only on the client-side)

Usage

You can require('socialcalc') or include node_modules/socialcalc/dist/SocialCalc.js on your web page using a script tag.

In order to create an editor instance use:

var socialCalcControl = new SocialCalc.SpreadsheetControl()
socialCalcControl.InitializeSpreadsheetControl(el /*, height, width, spacebelow*/)

This package also works in node.js. You don't need to callc InitializeSpreadsheetControl here, because that is just initializing the rendering.

Build from sources

SocialCalc builds with Bun and type-checks with tsgo (the native TypeScript 7.0 compiler). Install the dependencies:

bun install

Build dist/SocialCalc.js and dist/socialcalc.css:

bun run build

Optional minified bundle (dist/SocialCalc.min.js):

bun run build:min

Type-check in strict mode:

bun run typecheck

Run the smoke tests (parse, recalc, formula coverage, strict-mode global-leak guard):

bun run test

The bundle loads cleanly under "use strict" and keeps the existing UMD entry points (browser global SocialCalc, AMD define, and CommonJS module.exports) so downstream callers don't need to change.

Mutation testing

Line coverage is a floor, not a ceiling. We use Stryker to check that the tests meaningfully pin behaviour — every mutant that survives is a behavior the tests do not actually exercise.

stryker.config.mjs drives Stryker through a generic command runner (bun run build.ts && bun test) so we don't need a Bun-specific plugin. Two modes:

• Fast per-file iteration — bun run mutate:file js/<source>.js [startLine-endLine] flips Stryker to in-place mode and filters the test command to only the test files that exercise that module (see the mapping in stryker-file.mjs). Also available: bun run mutate:format, bun run mutate:sheet, bun run mutate:formula.
• Full sandbox run — bun run mutate copies the project into parallel sandboxes and mutates every source in the mutate list. Slower but useful before tagging a release.

Reports are emitted to reports/mutation/index.html (Stryker's interactive viewer) and reports/mutation/mutation.json (the raw data). Incremental mode is enabled, so iterating after adding killing tests only re-checks the previously-surviving mutants.

Current mutation scores:

Module	Score	Status
formatnumber2.js	95.20%	Remaining 54 survivors classified as equivalent mutants
formula1.js	—	Parser/evaluator run in progress
socialcalc-3.js	—	Not yet measured
UI modules	—	Not yet measured (heavily DOM-coupled)

Licensing

Common Public Attribution License (Socialtext Inc.)

• socialcalcspreadsheetcontrol.js
• socialcalctableeditor.js

Artistic License 2.0 (Socialtext Inc.)

• formatnumber2.js
• formula1.js
• socialcalc-3.js
• socialcalcconstants.js
• socialcalcpopup.js

Mozilla Public License 2.0

• images/sc_*.png