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---@meta
--- Run diff on strings {a} and {b}. Any indices returned by this function,
--- either directly or via callback arguments, are 1-based.
---
--- Examples:
--- <pre>lua
--- vim.diff('a\\n', 'b\\nc\\n')
--- -- =>
--- -- @@ -1 +1,2 @@
--- -- -a
--- -- +b
--- -- +c
---
--- vim.diff('a\\n', 'b\\nc\\n', {result_type = 'indices'})
--- -- =>
--- -- {
--- -- {1, 1, 1, 2}
--- -- }
--- </pre>
---
--- @param a string First string to compare
--- @param b string Second string to compare
--- @param opts table<string,any> Optional parameters:
--- - `on_hunk` (callback):
--- Invoked for each hunk in the diff. Return a negative number
--- to cancel the callback for any remaining hunks.
--- Args:
--- - `start_a` (integer): Start line of hunk in {a}.
--- - `count_a` (integer): Hunk size in {a}.
--- - `start_b` (integer): Start line of hunk in {b}.
--- - `count_b` (integer): Hunk size in {b}.
--- - `result_type` (string): Form of the returned diff:
--- - "unified": (default) String in unified format.
--- - "indices": Array of hunk locations.
--- Note: This option is ignored if `on_hunk` is used.
--- - `linematch` (boolean|integer): Run linematch on the resulting hunks
--- from xdiff. When integer, only hunks upto this size in
--- lines are run through linematch. Requires `result_type = indices`,
--- ignored otherwise.
--- - `algorithm` (string):
--- Diff algorithm to use. Values:
--- - "myers" the default algorithm
--- - "minimal" spend extra time to generate the
--- smallest possible diff
--- - "patience" patience diff algorithm
--- - "histogram" histogram diff algorithm
--- - `ctxlen` (integer): Context length
--- - `interhunkctxlen` (integer):
--- Inter hunk context length
--- - `ignore_whitespace` (boolean):
--- Ignore whitespace
--- - `ignore_whitespace_change` (boolean):
--- Ignore whitespace change
--- - `ignore_whitespace_change_at_eol` (boolean)
--- Ignore whitespace change at end-of-line.
--- - `ignore_cr_at_eol` (boolean)
--- Ignore carriage return at end-of-line
--- - `ignore_blank_lines` (boolean)
--- Ignore blank lines
--- - `indent_heuristic` (boolean):
--- Use the indent heuristic for the internal
--- diff library.
---
--- @return string|table|nil
--- See {opts.result_type}. `nil` if {opts.on_hunk} is given.
function vim.diff(a, b, opts) end
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