Inital commit

tools/ui/src/lib/constants/message-export.ts

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+// Conversation filename constants
+
+// Length of the trimmed conversation ID in the filename
+export const EXPORT_CONV_ID_TRIM_LENGTH = 8;
+// Maximum length of the sanitized conversation name snippet
+export const EXPORT_CONV_NAME_SUFFIX_MAX_LENGTH = 20;
+// Characters to keep in the ISO timestamp. 19 keeps 2026-01-01T00:00:00
+export const ISO_TIMESTAMP_SLICE_LENGTH = 19;
+
+// Producer marker carried by the session record of a JSONL export
+export const SESSION_HARNESS = 'llama.app';
+
+// Replacements for making the conversation title filename-friendly
+export const NON_ALPHANUMERIC_REGEX = /[^a-z0-9]/gi;
+export const EXPORT_CONV_NONALNUM_REPLACEMENT = '_';
+export const MULTIPLE_UNDERSCORE_REGEX = /_+/g;
+
+// Replacements to the ISO date for use in the export filename
+export const ISO_DATE_TIME_SEPARATOR = 'T';
+export const ISO_DATE_TIME_SEPARATOR_REPLACEMENT = '_';
+
+export const ISO_TIME_SEPARATOR = ':';
+export const ISO_TIME_SEPARATOR_REPLACEMENT = '-';