Populate JSDoc descriptions for TransformationFunction

diff --git a/src/core.js b/src/core.js
index a86c8edbaf4eeb92adcc8ce053ab13891d8764f8..d5a9d97f8fd09c5f8eff138a4a4c7db7379fcfe8 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -140,8 +140,8 @@ export function createCSVReadableStream(path) {
 /**
  * A function to process a row or rows of CSV data from `createCSVReadableStream`.
  * @callback TransformationFunction
- * @param {TransformationInput} row
- * @returns {TransformationOutput}
+ * @param {TransformationInput} row A row or rows of input CSV data before transformation.
+ * @returns {TransformationOutput} A row or rows of output CSV data after transformation, or null to skip a row.
  */
 
 /**