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NOTICE about package.json
See more details about in the "exports" field of package.json and why it is written like that in https://github.com/apache/echarts/pull/19513 .
Public and private
Only these entries are officially exported to users:
'echarts''echarts/index.js''echarts/index.blank.js''echarts/index.common.js''echarts/index.simple.js''echarts/core.js''echarts/charts.js''echarts/components.js''echarts/features.js''echarts/renderers.js''echarts/i18n/*'echarts/theme/*'echarts/types/*'echarts/extension/*'echarts/dist/*'echarts/ssr/client/index.js'
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.
File extension fully specified
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 echarts/i18n/xxx or echarts/theme/xxx or 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.
Use physical entry file or alias in "exports" of package.json
Although using "exports" of package.json we can make alias (or say, route) to physical file (for example: { "exports": { "./xxx": "./yyy/zzz.js" } } enables import 'echarts/xxx' to route to 'echarts/yyy/zzz.js'), at present we can not make sure all the versions of bundle tools and runtimes in use do it consistently. So we do not use the alias setting, but keep providing physical file for each public entry. For example, for an official public entry 'echarts/core', we provide a file echarts/core.js (and echarts/core.d.ts).