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Migration to v4
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===============
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v4 has the same external API as v3, but significantly changed internals. Plugin
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authors should update their packages.
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## For users
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External API did not changed.
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- If you used `markdown-it` with plugins - make shure to update those.
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- If you modified renderer - see dev info below.
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- If you did not used plugins and renderer modification - no chanches needed.
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## For Developpers
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### Tokens and renderer
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- [Tokens](https://github.com/markdown-it/markdown-it/blob/master/lib/token.js)
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are now classes, and allow arbitrary attributes.
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- new tokens are created with `token = state.push(type, tag, nesting)`.
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See [this commit](https://github.com/markdown-it/markdown-it/commit/4aabd5592ea55fb43d6a215b316c89c6f6f1f7db) to understand
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how to create tokens in new way. Also see changes in plugins from other
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repos in this org.
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- [Renderer](https://github.com/markdown-it/markdown-it/blob/master/lib/renderer.js)
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methods were unified. Number of custom renderer rules were significantly reduced.
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Custom renderer functions need update due tokens format change.
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### Other changes
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- `.validateUrl()` -> moved to root class `.validateLink()`
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- added `.normalizeLink()` & `.normalizeLinkText()` to root class, and removed
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`normalizeUrl()` from utils.
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- removed `replaceEntities()` in `utils`.
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