# Technical Documentation: ecomfe/zrender

> ℹ️ **Provenance:** Multi-Tier Ingestion · [CodeWiki Reference](https://codewiki.google/github.com/ecomfe/zrender)

### Overview (`README.md`)

ZRender
=======

A lightweight graphic library which provides 2d draw for [Apache ECharts](https://github.com/apache/echarts).

[](https://github.com/ecomfe/zrender/actions) [](https://www.npmjs.com/package/zrender) 

## Documentation

[https://ecomfe.github.io/zrender-doc/public/](https://ecomfe.github.io/zrender-doc/public/)


## License

BSD 3-Clause License

Copyright (c) 2017, Baidu Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

* Neither the name of the copyright holder nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

## Notice

The Apache Software Foundation [Apache ECharts, ECharts](https://echarts.apache.org/), Apache, the Apache feather, and the Apache ECharts project logo are either registered trademarks or trademarks of the [Apache Software Foundation](https://www.apache.org/).

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### Overview (`package.README.md`)

# NOTICE about package.json

Only `zrender.js` are officially exported to users.

The other entries listed in the `"exports"` field of `package.json` make the internal files visible, but they are legacy usages, not recommended but not forbidden (for the sake of keeping backward compatible). These entries are made from the search in github about which internal files are imported.

Since `v5.5.0`, `"type": "module"` and `"exports: {...}"` are added to `package.json`. When upgrading to `v5.5.0+`, if you meet some problems about "can not find/resolve xxx" when importing some internal files, it probably because of the issue "file extension not fully specified". Please try to make the file extension fully specified (that is, `import 'xxx/xxx/xxx.js'` rather than `import 'xxx/xxx/xxx'`), or change the config of you bundler tools to support auto adding file extensions.

See more details about the `"exports"` field of `package.json` and why it is written like that in https://github.com/apache/echarts/pull/19513 .

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- Canonical Reference: https://codewiki.google/github.com/ecomfe/zrender