perf(dsv)!: use hook filters (#1994)

* feat(dsv)!: use hook filters

BREAKING CHANGES:
- drops support for rollup below v2.78.0

* docs(dsv): update Rollup version

---------

Co-authored-by: Andrew Powell <shellscape@users.noreply.github.com>

Author: sapphi-red

packages/dsv/README.md

@@ -13,7 +13,7 @@
 
 ## Requirements
 
-This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v14.0.0+) and Rollup v1.20.0+.
+This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v14.0.0+) and Rollup v2.78.0+.
 
 ## Install
 

packages/dsv/package.json

@@ -44,7 +44,7 @@
     "rollup-plugin"
   ],
   "peerDependencies": {
-    "rollup": "^1.20.0||^2.0.0||^3.0.0||^4.0.0"
+    "rollup": "^2.78.0||^3.0.0||^4.0.0"
   },
   "peerDependenciesMeta": {
     "rollup": {

packages/dsv/src/index.js

@@ -6,29 +6,39 @@ import { createFilter } from '@rollup/pluginutils';
 import stripBom from 'strip-bom';
 
 const parsers = { '.csv': csvParse, '.tsv': tsvParse };
+const idFilter = new RegExp(
+  `\\.(?:${Object.keys(parsers)
+    .map((ext) => ext.slice(1))
+    .join('|')})$`
+);
 
 export default function dsv(options = {}) {
   const filter = createFilter(options.include, options.exclude);
 
   return {
     name: 'dsv',
 
-    transform(code, id) {
-      if (!filter(id)) return null;
+    transform: {
+      filter: {
+        id: idFilter
+      },
+      handler(code, id) {
+        if (!filter(id)) return null;
 
-      const ext = extname(id);
-      if (!(ext in parsers)) return null;
+        const ext = extname(id);
+        if (!(ext in parsers)) return null;
 
-      let rows = parsers[ext](stripBom(code));
+        let rows = parsers[ext](stripBom(code));
 
-      if (options.processRow) {
-        rows = rows.map((row) => options.processRow(row, id) || row);
-      }
+        if (options.processRow) {
+          rows = rows.map((row) => options.processRow(row, id) || row);
+        }
 
-      return {
-        code: `export default ${toSource(rows)};`,
-        map: { mappings: '' }
-      };
+        return {
+          code: `export default ${toSource(rows)};`,
+          map: { mappings: '' }
+        };
+      }
     }
   };
 }