type script

1 files changed, 36 insertions, 0 deletions

diff --git a/src_js/csv.ts b/src_js/csv.ts
new file mode 100644
index 0000000..8ab4f51
--- /dev/null
+++ b/src_js/csv.ts
@@ -0,0 +1,36 @@
+// @ts-ignore
+import Papa from 'papaparse';
+
+
+export async function decode<TKey extends string>(
+    blob: Blob,
+    header: Record<TKey, (val: string) => any>
+): Promise<Record<TKey, any>[]> {
+    const data = await new Promise(resolve => {
+        Papa.parse(blob, {
+            header: true,
+            complete: (result: any) => resolve(result.data)
+        });
+    }) as Record<string, string>[];
+
+    const result: Record<TKey, any>[] = [];
+    for (const i of data) {
+        let element = {} as Record<TKey, any> | null;
+        for (const [k, v] of Object.entries(header)) {
+            if (!(k in i)) {
+                element = null;
+                break;
+            }
+            (element as any)[k] = (v as any)(i[k]);
+        }
+        if (element)
+            result.push(element);
+    }
+    return result;
+}
+
+
+export function encode(data: Record<string, any>[]): Blob  {
+    const csvData = Papa.unparse(data);
+    return new Blob([csvData], {type: 'text/csv'});
+}