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42 lines
789 B
JavaScript
42 lines
789 B
JavaScript
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// @ts-check
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/**
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* @typedef {import('./types').CommentOp} CommentOp
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* @typedef {import('./types').DeleteOp} DeleteOp
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* @typedef {import('./types').InsertOp} InsertOp
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* @typedef {import('./types').Op} Op
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* @typedef {import('./types').RetainOp} RetainOp
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*/
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/**
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* @param {Op} op
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* @returns {op is InsertOp}
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*/
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export function isInsert(op) {
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return 'i' in op && op.i != null
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}
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/**
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* @param {Op} op
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* @returns {op is RetainOp}
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*/
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export function isRetain(op) {
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return 'r' in op && op.r != null
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}
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/**
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* @param {Op} op
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* @returns {op is DeleteOp}
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*/
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export function isDelete(op) {
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return 'd' in op && op.d != null
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}
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/**
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* @param {Op} op
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* @returns {op is CommentOp}
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*/
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export function isComment(op) {
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return 'c' in op && op.c != null && 't' in op && op.t != null
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}
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