Also fix completeness test

bin/check.sh

@@ -3,12 +3,8 @@ set -eu
 
 BIN=$(dirname "$0")
 
-list_exports() {
-    "$BIN/linenos" --all --types --exports "$1" | cut -f1 | sort -u
-}
-
 list_decoders() {
-    "$BIN/linenos" --all --exports src/index.ts | cut -f1 | sort -u
+    node bin/exported-decoders.mjs | sort -u
 }
 
 echo "==> Checking documentation" >&2

bin/exported-decoders.mjs

@@ -0,0 +1,27 @@
+import { Project } from 'ts-morph';
+
+const project = new Project({
+  tsConfigFilePath: './tsconfig.json',
+});
+
+// NOTE: This is a bit caveman-style. Ideally, we would write the loop below to
+// check if these are _type_ exports or not. But I haven't figured out yet how
+// to do that programmatically.
+const NOT_DECODERS = new Set([
+  'Decoder',
+  'DecodeResult',
+  'DecoderType',
+  'JSONArray',
+  'JSONObject',
+  'JSONValue',
+  'Scalar',
+]);
+
+for (const src of project.getSourceFiles('src/index.ts')) {
+  for (const sym of src.getExportSymbols()) {
+    const name = sym.getName();
+    if (!NOT_DECODERS.has(name)) {
+      console.log(name);
+    }
+  }
+}