31 lines
760 B
JavaScript
31 lines
760 B
JavaScript
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import { Block, Text } from 'slate';
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/**
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* Rules are used to validate the editor state each time it changes, to ensure
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* it is never rendered in an undesirable state.
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*/
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/**
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* If the editor is ever in an empty state, insert an empty
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* paragraph block.
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*/
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const enforceNeverEmpty = {
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match: object => object.kind === 'document',
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validate: doc => {
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const hasBlocks = !doc.getBlocks().isEmpty();
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return hasBlocks ? null : {};
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},
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normalize: transform => {
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const block = Block.create({
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type: 'paragraph',
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nodes: [Text.createFromString('')],
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});
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const { key } = transform.state.document;
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return transform.insertNodeByKey(key, 0, block).focus();
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},
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};
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const rules = [ enforceNeverEmpty ];
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export default rules;
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