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import { StateEffect, StateField, TransactionSpec } from '@codemirror/state';
import { EditorView, Decoration, DecorationSet } from '@codemirror/view';
export type TransactionSpecFactory = (decorations: DecorationSet) => TransactionSpec;
export function decorationSetExtension(): [TransactionSpecFactory, StateField<DecorationSet>] {
const setEffect = StateEffect.define<DecorationSet>();
const field = StateField.define<DecorationSet>({
create() {
return Decoration.none;
},
update(currentDecorations, transaction) {
let newDecorations: DecorationSet | null = null;
transaction.effects.forEach((effect) => {
if (effect.is(setEffect)) {
newDecorations = effect.value;
}
});
if (newDecorations === null) {
if (transaction.docChanged) {
return currentDecorations.map(transaction.changes);
}
return currentDecorations;
}
return newDecorations;
},
provide: (f) => EditorView.decorations.from(f),
});
function transactionSpecFactory(decorations: DecorationSet) {
return {
effects: [
setEffect.of(decorations),
],
};
}
return [transactionSpecFactory, field];
}
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