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HyperFormula is an open-source headless spreadsheet for business web apps. It comes with over 400 formulas, CRUD operations, undo-redo, clipboard support, and sorting.

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### Context ### How has this been tested? ### Types of changes - [ ] Bug fix (non-breaking change which fixes an issue) - [ ] New feature or improvement...

### Description HyperFormula does not support reference operators for `union` and `intersection`. ⚠️ Because there are differences in syntax it might be necessary to add configuration #58 options. ### Differences...

ODFF SGE
ODFF Conformance
Feature
ODFF MGE
Verified

### Description Since we're supporting Worksheets it would be cool to support all features. ``` =SUM(Sheet1:Sheet4!B3) ``` ![obraz](https://user-images.githubusercontent.com/4718998/68947322-7284c400-07b5-11ea-89dd-be60d2b36ca6.png) We need to support all CRUD operations on Worksheets: - Add sheet...

ODFF SGE
ODFF Conformance
Feature
Verified

### Description This is a part of the #126 Named Expressions Epic. #### Goals Finish the Structured References syntax to the point of full compatiblity with XL. It should be...

API
Feature
Verified
Named Expressions

### TL;DR; Sometimes columns (and rows) have customized names. Using the A1 or R1C1 addressing in this context is very confusing for the end-user. We need a way to translate...

Feature
Epic
Verified
Named Expressions

### Description From working on Custom Functions #317 looks like it's useful to have functions and languages registered globally (static) and locally (instance) so we can have both, shared registry...

API
Feature
Verified
Named Expressions

### Description This is a part of the #126 Named Expressions Epic. #### Goals - [ ] Add support for #131 array type named expressions `=A1:C22` - [ ] Add...

Feature
Verified
Named Expressions

### Description When Named Expression is added the changes are calculated. With an absolute address, the changes will be calculated for real values that are part of the workbook. But...

To Be Discussed
Verified
Named Expressions

### Description If we have an IF function where the conditions that lead to #CYCLE! error isn't met we will get an error anyway. All other spreadsheets I've checked, GS,...

To Be Discussed
Verified

### Description We should add a cell address to the error message so we can trace the source of this error more easily. https://github.com/handsontable/hyperformula/blob/508e4e4d9961473a35686354f46e3162be2cd53e/src/DependencyGraph/FormulaCellVertex.ts#L74 A simple `JSON.stringify` should do. ie:...

Feature
Verified