first commit

services/web/frontend/js/features/ide-react/util/file-view.ts

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+import { FileRef } from '../../../../../types/file-ref'
+import { BinaryFile } from '@/features/file-view/types/binary-file'
+
+export function convertFileRefToBinaryFile(fileRef: FileRef): BinaryFile {
+  const timestamp = fileRef.linkedFileData?.importedAt ?? fileRef.created
+  return {
+    _id: fileRef._id,
+    name: fileRef.name,
+    id: fileRef._id,
+    type: 'file',
+    selected: true,
+    linkedFileData: fileRef.linkedFileData,
+    created: timestamp ? new Date(timestamp) : new Date(),
+    hash: fileRef.hash,
+  }
+}
+
+// `FileViewHeader`, which is TypeScript, expects a BinaryFile, which has a
+// `created` property of type `Date`, while `TPRFileViewInfo`, written in JS,
+// into which `FileViewHeader` passes its BinaryFile, expects a file object with
+// `created` property of type `string`, which is a mismatch. `TPRFileViewInfo`
+// is the only one making runtime complaints and it seems that other uses of
+// `FileViewHeader` pass in a string for `created`, so that's what this function
+// does too.
+export function fileViewFile(fileRef: FileRef) {
+  const converted = convertFileRefToBinaryFile(fileRef)
+  return {
+    ...converted,
+    created: converted.created.toISOString(),
+  }
+}

services/web/frontend/js/features/ide-react/util/find-doc-entity-by-id.ts

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+import { findInTree } from '@/features/file-tree/util/find-in-tree'
+import { Folder } from '../../../../../types/folder'
+import { Doc } from '../../../../../types/doc'
+import { FileRef } from '../../../../../types/file-ref'
+
+export function findDocEntityById(fileTreeData: Folder, docId: string) {
+  const item = findInTree(fileTreeData, docId)
+  if (!item || item.type !== 'doc') {
+    return null
+  }
+  return item.entity as Doc
+}
+
+export function findFileRefEntityById(fileTreeData: Folder, docId: string) {
+  const item = findInTree(fileTreeData, docId)
+  if (!item || item.type !== 'fileRef') {
+    return null
+  }
+  return item.entity as FileRef
+}