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Extension descriptor (YAML)

Run WebAssembly component extensions inside DuckDB

Installing and Loading

INSTALL ducklink FROM community;
LOAD ducklink;

Example

-- The extension ships one built-in, so loading works with no component:
LOAD ducklink;
SELECT ducklink_version();   -- e.g. 'ducklink 0.1.0'

-- To expose a component's functions, point ducklink at one or more
-- `duckdb:extension` WebAssembly components via the DUCKLINK_COMPONENTS
-- environment variable BEFORE starting DuckDB, e.g.
--   DUCKLINK_COMPONENTS=isin=/path/to/isin.wasm
-- then every function the component registers becomes callable:
--   LOAD ducklink;
--   SELECT isin_is_valid('US0378331005');

About ducklink

ducklink lets a single, portable WebAssembly component — built once against the duckdb:extension WIT world — load into DuckDB on any supported platform without per-platform native builds. The extension embeds wasmtime, loads each component named in the DUCKLINK_COMPONENTS environment variable (a :-separated list of name=path entries, read when LOAD ducklink runs), runs its load() to capture the scalar/table/aggregate functions it registers, and bridges them into DuckDB's function catalog. A built-in ducklink_version() scalar is always available so the extension is usable and testable before any component is configured. The same components run unchanged under the standalone ducklink host (DuckDB-compiled-to-wasm), so one artifact targets both directions.

Added Functions

Overloaded Functions

This extension does not add any function overloads.

Added Types

This extension does not add any types.

Added Settings

This extension does not add any settings.