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-rw-r--r--packages/sw/src/scripts/url.ts5
1 files changed, 5 insertions, 0 deletions
diff --git a/packages/sw/src/scripts/url.ts b/packages/sw/src/scripts/url.ts
index 1266bfedfd..5255076156 100644
--- a/packages/sw/src/scripts/url.ts
+++ b/packages/sw/src/scripts/url.ts
@@ -1,3 +1,8 @@
+/* objを検査して
+ * 1. 配列に何も入っていない時はクエリを付けない
+ * 2. プロパティがundefinedの時はクエリを付けない
+ * (new URLSearchParams(obj)ではそこまで丁寧なことをしてくれない)
+ */
export function query(obj: object): string {
const params = Object.entries(obj)
.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)